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Journal articles on the topic 'Porous Shape Memory Alloys'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Panico, M., and L. C. Brinson. "Computational modeling of porous shape memory alloys." International Journal of Solids and Structures 45, no. 21 (October 2008): 5613–26. http://dx.doi.org/10.1016/j.ijsolstr.2008.06.005.

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2

Tuissi, Ausonio, Paola Bassani, and Carlo Alberto Biffi. "CuZnAl Shape Memory Alloys Foams." Advances in Science and Technology 78 (September 2012): 31–39. http://dx.doi.org/10.4028/www.scientific.net/ast.78.31.

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Foams and other highly porous metallic materials with cellular structures are known to have many interesting combinations of physical and mechanical properties. That makes these systems very attractive for both structural and functional applications. Cellular metals can be produced by several methods including liquid infiltration of leachable space holders. In this contribution, results on metal foams of Cu based shape memory alloys (SMAs) processed by molten metal infiltration of SiO2 particles are presented. By using this route, highly homogeneous CuZnAl SMA foams with a spherical open-cell morphologies have been manufactured and tested. Morphological, thermo-mechanical and cycling results are reported.

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3

Liu, Bing Fei, Guan Suo Dui, and Yu Ping Zhu. "A Micromechanical Constitutive Model for Porous Shape Memory Alloys." Applied Mechanics and Materials 29-32 (August 2010): 1855–61. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1855.

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A micromechanical constitutive model for responding the macroscopic behavior of porous shape memory alloys (SMA) has been proposed in this work. According to the micromechanical method, the stiffness tensor of the porous SMA is obtained. The critical stresses are calculated by elastic mechanics. Based on the general concept of secant moduli method, the effective secant moduli of the porous SMA is given in terms of the secant moduli of dense SMA and the volume fraction of pores. The model takes account of the tensile-compressive asymmetry of SMA materials and the effect of the hydrostatic stress. Only the material parameters of dense SMA are needed for numerical calculation, and can degenerate to dense material. Examples for the uniaxial response of porous SMA materials at constant temperature are then used to illustrate one possible application of the constitutive model. The numerical results have been compared with the experiment data for porous SMA, which show that the modeling results are in good agreement with the experiments.

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4

Yuan, Bin, Min Zhu, and Chi Yuen Chung. "Biomedical Porous Shape Memory Alloys for Hard-Tissue Replacement Materials." Materials 11, no. 9 (September 13, 2018): 1716. http://dx.doi.org/10.3390/ma11091716.

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Porous shape memory alloys (SMAs), including NiTi and Ni-free Ti-based alloys, are unusual materials for hard-tissue replacements because of their unique superelasticity (SE), good biocompatibility, and low elastic modulus. However, the Ni ion releasing for porous NiTi SMAs in physiological conditions and relatively low SE for porous Ni-free SMAs have delayed their clinic applications as implantable materials. The present article reviews recent research progresses on porous NiTi and Ni-free SMAs for hard-tissue replacements, focusing on two specific topics: (i) synthesis of porous SMAs with optimal porous structure, microstructure, mechanical, and biological properties; and, (ii) surface modifications that are designed to create bio-inert or bio-active surfaces with low Ni releasing and high biocompatibility for porous NiTi SMAs. With the advances of preparation technique, the porous SMAs can be tailored to satisfied porous structure with porosity ranging from 30% to 85% and different pore sizes. In addition, they can exhibit an elastic modulus of 0.4–15 GPa and SE of more than 2.5%, as well as good cell and tissue biocompatibility. As a result, porous SMAs had already been used in maxillofacial repairing, teeth root replacement, and cervical and lumbar vertebral implantation. Based on current research progresses, possible future directions are discussed for “property-pore structure” relationship and surface modification investigations, which could lead to optimized porous biomedical SMAs. We believe that porous SMAs with optimal porous structure and a bioactive surface layer are the most competitive candidate for short-term and long-term hard-tissue replacement materials.

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5

XIONG, JIANYU, YUNCANG LI, PETER D. HODGSON, and CUI'E WEN. "INFLUENCE OF POROSITY ON SHAPE MEMORY BEHAVIOR OF POROUS TiNi SHAPE MEMORY ALLOY." Functional Materials Letters 01, no. 03 (December 2008): 215–19. http://dx.doi.org/10.1142/s1793604708000332.

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Porous Ti -50.5at.% Ni shape memory alloy (SMA) samples with a range of porosities were prepared by spacer sintering. The porous structure of the alloy was examined using scanning electron microscopy (SEM). The phase constituents of the porous TiNi alloy were determined by X-ray diffraction (XRD). The shape memory behavior of the porous TiNi alloy was investigated using loading–unloading compression tests. Results indicate that the porous TiNi alloy exhibits superelasticity and the recoverable strain by the superelasticity decreases with the increase of porosity. After a prestrain of 7%, the superelastically recovered strains for the porous TiNi alloy samples with porosities of 46%, 59%, 69% and 77% are 2.0%, 1.8%, 1.5% and 1.3%, respectively. The pores in the TiNi alloy samples cause stress/strain concentration, as well as crack initiation, which adversely affect the shape memory behavior of the porous TiNi alloy.

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6

Entchev, Pavlin B., and Dimitris C. Lagoudas. "Modeling porous shape memory alloys using micromechanical averaging techniques." Mechanics of Materials 34, no. 1 (January 2002): 1–24. http://dx.doi.org/10.1016/s0167-6636(01)00088-6.

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7

Abdollahzadeh, Masumeh, Seyed Hamed Hoseini, and Shirko Faroughi. "Modeling of superelastic behavior of porous shape memory alloys." International Journal of Mechanics and Materials in Design 16, no. 1 (May 11, 2019): 109–21. http://dx.doi.org/10.1007/s10999-019-09457-x.

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8

Liu, Bingfei, Guansuo Dui, and Yuping Zhu. "On phase transformation behavior of porous Shape Memory Alloys." Journal of the Mechanical Behavior of Biomedical Materials 5, no. 1 (January 2012): 9–15. http://dx.doi.org/10.1016/j.jmbbm.2011.09.015.

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9

Kaya, Mehmet, and Ömer Çakmak. "Shape Memory Behavior of Porous NiTi Alloy." Metallurgical and Materials Transactions A 47, no. 4 (January 19, 2016): 1499–503. http://dx.doi.org/10.1007/s11661-015-3318-1.

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10

Biesiekierski, Arne, James Wang, and Cui'e Wen. "A Brief Review of Biomedical Shape Memory Alloys by Powder Metallurgy." Key Engineering Materials 520 (August 2012): 195–200. http://dx.doi.org/10.4028/www.scientific.net/kem.520.195.

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In the realm of bioimplantation, titanium-based Shape Memory Alloys (SMAs) exhibit phenomenal versatility, with successful application in diverse fields. One area of particular interest is that of orthopaedics, where the unique properties of SMAs offer a range of benefits. That said, existing alloys still have unresolved issues concerning biocompatibility and osseointegration. Primary concerns include carcinogenicity, allergenicity and a significant mismatch between the Young’s moduli of bone and osteoimplants; issues that could be addressed via a novel porous titanium alloy. With that in mind, this paper seeks to provide a review identifying promising candidates for new, perfectly biocompatible alloys for production via powder metallurgy. Furthermore, an attempt will also be made to summarise existing research into appropriate methods for the production of a porous Ti-based SMA implant.

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11

Tao, Yi Yi, Jiu Hua Xu, and Wen Feng Ding. "A Study on Grinding Performance of Porous NiTi Shape Memory Alloy." Key Engineering Materials 359-360 (November 2007): 143–47. http://dx.doi.org/10.4028/www.scientific.net/kem.359-360.143.

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The machining performance of porous NiTi shape memory alloys prepared using powder metallurgical production technique has been investigated experimentally in the grinding operation. Grinding force ratio, specific grinding energy, surface characteristics were detected. The result reveals that, much difference of grinding characteristics exists among three kinds of NiTi alloy because of the pore rate and the mechanical performance induced by TiH2. Under the experimental conditions, the integrated effects of predominant plastic flow and slight brittle fracture were taken for porous NiTi alloy during grinding. Additionally, the grinding parameters should be chosen carefully, otherwise the surface quality deteriorates and even the microcrack perhaps appears.

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12

Kim, Yeon-wook, and Dalhyun Do. "Shape memory characteristics of highly porous Ti-rich TiNi alloys." Materials Letters 162 (January 2016): 1–4. http://dx.doi.org/10.1016/j.matlet.2015.09.101.

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13

Qidwai, Muhammad A., Pavlin B. Entchev, Dimitris C. Lagoudas, and Virginia G. DeGiorgi. "Modeling of the thermomechanical behavior of porous shape memory alloys." International Journal of Solids and Structures 38, no. 48-49 (November 2001): 8653–71. http://dx.doi.org/10.1016/s0020-7683(01)00118-4.

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14

Artyukhova, N. V., Yu F. Yasenchuk, Kim Ji-Soon, and V. É. Gunther. "Reaction Sintering of Porous Shape-Memory Titanium−Nickelide-Based Alloys." Russian Physics Journal 57, no. 10 (February 2015): 1313–20. http://dx.doi.org/10.1007/s11182-015-0383-2.

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15

Scalzo, O., S. Turenne, M. Gauthier, and V. Brailovski. "Mechanical and Microstructural Characterization of Porous NiTi Shape Memory Alloys." Metallurgical and Materials Transactions A 40, no. 9 (July 14, 2009): 2061–70. http://dx.doi.org/10.1007/s11661-009-9906-1.

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16

Abidi, Irfan Haider, and Fazal Ahmad Khalid. "Sintering and Morphology of Porous Structure in NiTi Shape Memory Alloys for Biomedical Applications." Advanced Materials Research 570 (September 2012): 87–95. http://dx.doi.org/10.4028/www.scientific.net/amr.570.87.

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The combination of attractive properties of porous NiTi shape memory alloys like high recoverable strain due to superelasticity and shape memory effect, good corrosion resistance, improved biocompatibilty, low density and stiffness along with its porous structure similar to that of bone make them best materials for biomedical implants. In current study porous NiTi SMAs have been fabricated successfully by space holder technique via pressureless sintering using NaCl powder as a spacer. Various volume fractions of NaCl powders have been involved to study their effect on the pore characteristics as well as on mechanical properties of foam. Porous NiTi with average porosity in the range of 44.3%-63.5% have been fabricated having average pore size 419µm which were very appropriate for various biomedical implants. Porous NiTi SMAs exhibited superelasticity at room temperature and shape memory effect was also determined. Maximum recoverable strain of 6.79% was demonstrated by the porous NiTi alloy with 44.3% porosity and it was diminishing with increasing porosity. Compression strength and elastic modulus have shown a decreasing trend with increasing porosity content. Elastic modulus of porous NiTi extends from 1.38 to 5.42GPa depending upon the pore volume which was very much comparable to that of various kinds of bones.

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17

Gong, Shen, Z. A. Xiao, and Zhou Li. "Porous CuAlMn Shape-Memory Alloys with Controlling Porosity and Pores’ Structural Parameter Produced by Sintering-Evaporation Process." Advanced Materials Research 123-125 (August 2010): 1011–14. http://dx.doi.org/10.4028/www.scientific.net/amr.123-125.1011.

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The porous Cu-11.9Al-2.5Mn (wt %) shape memory alloys with open-cell structure were successfully prepared by Sintering-evaporation Process method. A mixture powders with CuAlMn and NaCl powder were hot pressed at 780°C for 3hrs in the hot-pressing equipment with dynamic vacuum of 0.001Pa, and then pressure force was unloaded and the sintering temperature was heated up to 990°C, the NaCl was melted and evaporated completely at 990°C for 24hrs. The shape and size of the pores among the porous CuAlMn shape memory alloys are almost the same as those of NaCl powders, the pores are interconnected. The microstructure, mechanical property and phase transformation behavior of the sample have been studied. The results show that the porous CuAlMn SMAs with controlling porosity and pores’ structural parameters can be prepared by Sintering-evaporation Process, and their phase transformation behaviors are similar to that of conventional bulk Cu-11.9Al-2.5Mn (wt %) shape memory alloys.

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18

Jiang, Hai Chang, and Li Jian Rong. "Microstructures and Mechanical Properties of Porous Ti₅₁Ni_(49-x)Mo_x Shape Memory Alloys." Materials Science Forum 546-549 (May 2007): 2127–32. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.2127.

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Porous Ti51Ni(49-x)Mox (x=0, 0.7, 1.0, 1.2) shape memory alloys were successfully fabricated by the self-propagating high-temperature synthesis (SHS) method. The effect of Mo content on microstructures, transformation characteristics and compressive properties of porous TiNiMo alloys was investigated systemically. It has been found that Mo doping into porous TiNi alloys will induce R phase transformation. A small amount of Mo addition (0.7at.%) improves compressive properties of porous TiNiMo alloy due to Mo solution strengthening and the obvious ductile fracture is observed on the fracture photography. However, the compressive strength and compressive strain of porous TiNiMo alloys with excessive Mo content decrease sharply and the failure manner turned into brittle fracture mode, which results from a large amount of Ti2Ni and Ti4Ni2O phases precipitated at grain boundary. Porous Ti51Ni48.3Mo0.7 alloy with suitable transformation temperature and high compressive strength is very promising for use as biomaterial and damping material.

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19

Li, Bing-Yun, Li-Jian Rong, Yi-Yi Li, and V. E. Gjunter. "A recent development in producing porous Ni–Ti shape memory alloys." Intermetallics 8, no. 8 (August 2000): 881–84. http://dx.doi.org/10.1016/s0966-9795(00)00024-8.

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20

TOI, Yutaka, and Daegon CHOI. "Constitutive Modeling of Porous Shape Memory Alloys Considering Strain Rate Effect." Transactions of the Japan Society of Mechanical Engineers Series A 73, no. 731 (2007): 753–60. http://dx.doi.org/10.1299/kikaia.73.753.

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21

TOI, Yutaka, and Daegon CHOI. "Constitutive Modeling of Porous Shape Memory Alloys Considering Strain Rate Effect." Journal of Computational Science and Technology 2, no. 4 (2008): 511–22. http://dx.doi.org/10.1299/jcst.2.511.

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22

Sayed, Tamer El, Ercan Gürses, and Amir Siddiq. "A phenomenological two-phase constitutive model for porous shape memory alloys." Computational Materials Science 60 (July 2012): 44–52. http://dx.doi.org/10.1016/j.commatsci.2012.02.031.

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23

Maîtrejean, Guillaume, Patrick Terriault, and Vladimir Brailovski. "Density Dependence of the Macroscale Superelastic Behavior of Porous Shape Memory Alloys: A Two-Dimensional Approach." Smart Materials Research 2013 (September 19, 2013): 1–13. http://dx.doi.org/10.1155/2013/749296.

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Porous Shape Memory Alloys (SMAs) are of particular interest for many industrial applications, as they combine intrinsic SMA (shape memory effect and superelasticity) and foam characteristics. The computational cost of direct porous material modeling is however extremely high, and so designing porous SMA structure poses a considerable challenge. In this study, an attempt is made to simulate the superelastic behavior of porous materials via the modeling of fully dense structures with material properties modified using a porous/bulk density ratio scaling relation. Using this approach, direct modeling of the porous microstructure is avoided, and only the macroscale response of the model is considered which contributes to a drastic reduction of the computational cost. Foam structures with a gradient of porosity are also studied, and the prediction made using the fully dense material model is shown to be in agreement with the mesoscale porous material model.

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24

Khodaei, Hamid, and Patrick Terriault. "Experimental validation of shape memory material model implemented in commercial finite element software under multiaxial loading." Journal of Intelligent Material Systems and Structures 29, no. 14 (June 18, 2018): 2954–65. http://dx.doi.org/10.1177/1045389x18781047.

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Shape memory alloys are used in ever-increasing numbers of applications, such as implants made of porous shape memory alloys, where the material is subjected to complex loading conditions with various loading paths. Finite element simulation of such parts requires utilizing a constitutive model that is able to capture the multiaxial and path-dependent behavior of shape memory alloys. The main objective of this article is to investigate the accuracy of the constitutive model implemented in current commercial finite element software such as Ansys in predicting the shape memory alloys mechanical response under different multiaxial loading paths. To this end, several isothermal tests were conducted on thin-walled NiTi tubes with uniaxial, as well as multiaxial, path-varying loadings. The performance of the material model within Ansys was then investigated by finite element modeling of the sample tubes and performing simulations of the tests. Comparing the finite element results with experimental data, it was observed that while this model provided a close prediction of the uniaxial tensile superelastic response, it was not able to reproduce the multiaxial and path-dependent behavior of the shape memory alloy samples with sufficient accuracy. A brief discussion of the reasons behind the inaccuracy of the current model and potentially promising models for future investigation are provided.

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25

Wang, Qingzhou, Fusheng Han, Jie Wu, and Gangling Hao. "Damping behavior of porous CuAlMn shape memory alloy." Materials Letters 61, no. 11-12 (May 2007): 2598–600. http://dx.doi.org/10.1016/j.matlet.2006.10.007.

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26

Zhao, Ying, Minoru Taya, Yansheng Kang, and Akira Kawasaki. "Compression behavior of porous NiTi shape memory alloy." Acta Materialia 53, no. 2 (January 2005): 337–43. http://dx.doi.org/10.1016/j.actamat.2004.09.029.

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27

DeGiorgi, Virginia G., and Muhammad A. Qidwai. "A computational mesoscale evaluation of material characteristics of porous shape memory alloys." Smart Materials and Structures 11, no. 3 (May 24, 2002): 435–43. http://dx.doi.org/10.1088/0964-1726/11/3/314.

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28

Jiang, Hai Chang, Shu Wei Liu, Xiu Yan Li, and Li Jian Rong. "Damping Characteristics of Biomedical Porous NiTi Shape Memory Alloy." Advanced Materials Research 97-101 (March 2010): 1083–86. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.1083.

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One internal friction peak associated with the B2↔B19’ transformation appears on the cooling curve of porous NiTi shape memory alloy and the dense NiTi alloy shows the maximum peak. The tan δ value increased with the increasing of strain amplitude and the decreasing of frequency. Tan δ value of porous alloy mainly comes from the energy absorbing of the matrix at the small strain amplitude, however, if the strain amplitude is large, the tan δ value comes from the energy consumption that overcomes the friction between folds and the plastic contribution.

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29

Fahimi, Pouya, Amin Hajarian, Amir Hossein Eskandari, Ali Taheri, and Mostafa Baghani. "Asymmetric bending response of shape memory alloy beam with functionally graded porosity." Journal of Intelligent Material Systems and Structures 31, no. 16 (July 20, 2020): 1935–49. http://dx.doi.org/10.1177/1045389x20942323.

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In this study, an innovative semi-analytical model is presented to simulate the bending behavior of a shape memory alloy porous beam throughout loading and unloading cycles. The basis of the proposed method is the improved Brinson model which can capture the asymmetry behaviors of shape memory alloys in tension and compression. The comparison of the semi-analytical solution with two-dimensional finite element analysis results for both symmetric and asymmetric models of a homogeneous shape memory alloy beam is presented for model validation. Afterward, bending analysis of shape memory alloy beams with uniform porosity and functionally grading porosity is studied. For this purpose, first, the bending analysis of a shape memory alloy beam with uniform porosity is investigated to show the effects of porosity coefficient on the free tip deflection and slope. Then, the bending analysis of a shape memory alloy beam with functionally grading porosity is simulated. Reported findings with respect to symmetric and asymmetric models indicate that raising the porosity coefficient brings about an increase in deflection and slope. Also, it highlights the significant difference between the results of the asymmetric and symmetric models. The proposed semi-analytical solution can be utilized as an efficient tool for studying the effects of changing any of the porosity coefficient, the geometry, and material of shape memory alloy beams.

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30

Zhu, Xiang, Liangliang Chu, and Guansuo Dui. "Constitutive Modeling of Porous Shape Memory Alloys Using Gurson–Tvergaard–Needleman Model Under Isothermal Conditions." International Journal of Applied Mechanics 12, no. 04 (May 2020): 2050038. http://dx.doi.org/10.1142/s1758825120500386.

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Based on the Gurson–Tvergaard–Needleman (GTN) model, a constitutive relationship considering both the effects of strain hardening and hydrostatic stress for porous shape memory alloys (SMAs) is proposed. To capture the relationship between microscopic and mesoscopic behaviors, a representative volume element (RVE) containing an array of spherical voids is presented. In this paper, an approximate solution including strain hardening exponent [Formula: see text] is deduced by considering the porous SMA as a two phase composite with the SMA matrix and the second phase representing voids. The model parameters, [Formula: see text] and [Formula: see text], accounting for interactions between voids are investigated to take into account their influences on strain hardening, critical phase transformation stress and yield surface. In addition, the evolution equations of phase transformation are derived and then applied to the simulation of porous Ni–Ti SMAs with a porosity of 13%. Using the calibrated GTN model parameters, the critical phase transformation stress closer to experimental data is obtained. The predictions of stress–strain curve by the proposed constitutive model are found to be in excellent agreement with published experimental data and finite element results. The results prove that the model is capable of reproducing the features of porous SMAs such as superelasticity, tensile-compressive asymmetry and internal loops under uniaxial even combined loading conditions. A conclusion is drawn that the present constitutive relationship is powerful and useful for the analysis of porous SMAs.

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31

Volkov, Aleksandr E., Margarita E. Evard, and Elisaveta N. Iaparova. "A beam model of porous shape memory alloy deformation." Materials Today: Proceedings 4, no. 3 (2017): 4631–36. http://dx.doi.org/10.1016/j.matpr.2017.04.042.

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32

Sprincenatu, R., A. Novac, G. Chilnicean, V. Bolocan, and C. Craciunescu. "Design of Porous Structures in Shape Memory Alloy Systems." IOP Conference Series: Materials Science and Engineering 416 (October 26, 2018): 012016. http://dx.doi.org/10.1088/1757-899x/416/1/012016.

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33

Kaya, Mehmet, Ömer Çakmak, Behçet Gülenç, and Kadri Can Atlı. "Thermomechanical cyclic stability of porous NiTi shape memory alloy." Materials Research Bulletin 95 (November 2017): 243–47. http://dx.doi.org/10.1016/j.materresbull.2017.07.016.

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34

Volkov, Aleksandr E., Margarita E. Evard, and Elizaveta N. Iaparova. "Modeling of Functional Properties of Porous Shape Memory Alloy." MATEC Web of Conferences 33 (2015): 02006. http://dx.doi.org/10.1051/matecconf/20153302006.

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35

Wu, Shuilin, Xiangmei Liu, K. W. K. Yeung, Z. S. Xu, C. Y. Chung, and Paul K. Chu. "Wear Properties of Porous NiTi Orthopedic Shape Memory Alloy." Journal of Materials Engineering and Performance 21, no. 12 (September 25, 2012): 2622–27. http://dx.doi.org/10.1007/s11665-012-0392-z.

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36

Zhao, Ying, and Minoru Taya. "Analytical Modeling for Stress-Strain Curve of a Porous NiTi." Journal of Applied Mechanics 74, no. 2 (January 17, 2006): 291–97. http://dx.doi.org/10.1115/1.2198250.

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Two models for predicting the stress-strain curve of porous NiTi under compressive loading are presented in this paper. Porous NiTi shape memory alloy is considered as a composite composed of solid NiTi as matrix and pores as inclusions. Eshelby’s equivalent inclusion method and Mori-Tanaka’s mean-field theory are employed in both models. Two types of pore connectivity are investigated. One is closed cells (model 1); the other is where the pores are interconnected to each other forming an open-cell microstructure (model 2). We also consider two different shapes of pores, spherical and ellipsoidal. The stress-strain curves of porous shape memory alloy with spherical pores and ellipsoidal pores are compared. It is found that the ellipsoidal shape assumption is more reasonable than the assumption of spherical pores. Comparison of the stress-strain curves of the two models shows that use of open-cell microstructure (model-2) makes the predictions more agreeable to the experimental results of porous NiTi whose microstructure exhibits open-cell microstructure.

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37

Yuan, B., C. Y. Chung, P. Huang, and M. Zhu. "Superelastic properties of porous TiNi shape memory alloys prepared by hot isostatic pressing." Materials Science and Engineering: A 438-440 (November 2006): 657–60. http://dx.doi.org/10.1016/j.msea.2005.12.077.

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38

Li, Bing-Yun, Li-Jian Rong, Yi-Yi Li, and V. E. Gjunter. "Electric resistance phenomena in porous Ni-Ti shape-memory alloys produced by SHS." Scripta Materialia 44, no. 5 (March 2001): 823–27. http://dx.doi.org/10.1016/s1359-6462(00)00653-9.

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39

Cengiz, E., O. M. Ozkendir, M. Kaya, E. Tirasoglu, I. H. Karahan, S. Kimura, and T. Hajiri. "Alloying effect on K-shell fluorescence parameters of porous NiTi shape memory alloys." Journal of Electron Spectroscopy and Related Phenomena 192 (January 2014): 55–60. http://dx.doi.org/10.1016/j.elspec.2014.01.002.

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40

Artyukhova, N. V., Yu F. Yasenchuk, K. V. Almaeva, A. S. Garin, V. I. Shtin, and V. E. Gunther. "Effect of sintering methods and cobalt addition on the shape memory properties of porous TiNi-based alloy." KnE Materials Science 2, no. 1 (July 17, 2017): 98. http://dx.doi.org/10.18502/kms.v2i1.785.

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The changes of shape memory characteristics and properties of the porous sintered TiNi-based alloy are possible by a choice of the sintering methods or use of cobalt doping additive, as the present investigation has showed. The comparative analysis of the temperature dependences of electric resistance and macrodeformation both alloys, obtained by reaction and diffusion sintering was conducted. Diffusion-sintered alloy have showed high shape memory parameters and a more uniform passing of martensitic transformations. This is connected with a larger fraction of TiNi phase (about 90 vol.%) after diffusion sintering. It was found that the martensitic transformation characteristics and reversibility of martensitic strain in the porous nickelid titanium depend on level of intrinsic stresses in the TiNi phase and stresses caused by Co impurity. The addition to 1.0 at.% Co decreases the internal stresses in the TiNi phase, and more than 1.0 at.% Co increases their due to the effect of precipitation hardening of the alloy.

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41

Monogenov, A. A., V. E. Gunther, O. A. Ivchenko, A. N. Stebluk, A. A. Radkewich, A. A. Ariamkin, and S. G. Shtofin. "Structure and Properties of Porous Alloys Based on NiTi Doped by Al, Fabricated by SHS-method." KnE Materials Science 2, no. 1 (July 17, 2017): 62. http://dx.doi.org/10.18502/kms.v2i1.781.

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The effect of aluminum doping of porous TiNi-based alloy on structure, penetrability, strength properties and characteristic temperature intervals of martensitic transformations, multiple shape memory effect (MSME) parameters were studied. In this paper porous alloys from mixture of titanium, nickel and aluminum (CAl=0-2.0 at. %) powders were obtained by self propagation high temperature synthesis (SHS-method). Aluminum additives allow to obtain a material which is characterized by an increased content of fine pores 10-20 mm, uniform pore size distribution, an increased level of strength. The optimum concentration of Al to obtain high properties of material was defined. The porous TiNi-based alloys doped with aluminum are promising to solve a number of complex medical problems, such as in vascular surgery and cellular technologies.

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42

El-Hadad, Shimaa H., Khaled M. Ibrahim, and Lothar Wagner. "Characteristics of Anodized Layer in Investment Cast Ni50Ti50 Shape Memory Alloy." Journal of Metallurgy 2014 (February 25, 2014): 1–6. http://dx.doi.org/10.1155/2014/346328.

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NiTi shape memory alloys are promising implant materials due to their shape memory effect and super elasticity. In the current study, some Ni50Ti50 (mass %) SMAs samples were prepared by investment casting. These samples were then anodized and thermally treated to improve the surface properties. A fully saturated oxide layer was obtained. The structure and hardness properties of the anodized surfaces were then investigated. A hard porous layer with no free Ni atoms could be obtained which can be used as prebiomimetic surface for biological application.

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ZHAO, Y., M. TAYA, Y. KANG, and H. IZUI. "SMS-10: Fabrication, Characterization and Modeling of Porous NiTi Shape Memory Alloy(SMS-II: SMART MATERIALS AND STRUCTURES, NDE)." Proceedings of the JSME Materials and Processing Conference (M&P) 2005 (2005): 30. http://dx.doi.org/10.1299/jsmeintmp.2005.30_3.

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ZHANG, Song, Chun-hua ZHANG, Hau-chung MAN, and Chang-sheng LIU. "Laser surface alloying fabricated porous coating on NiTi shape memory alloy." Transactions of Nonferrous Metals Society of China 17, no. 2 (April 2007): 228–31. http://dx.doi.org/10.1016/s1003-6326(07)60076-4.

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Bansiddhi, Ampika, and David C. Dunand. "Shape-memory NiTi–Nb foams." Journal of Materials Research 24, no. 6 (June 2009): 2107–17. http://dx.doi.org/10.1557/jmr.2009.0256.

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A new powder metallurgy technique for creating porous NiTi is demonstrated, combining liquid phase sintering of prealloyed NiTi powders by Nb additions and pore creation by NaCl space-holders. The resulting foams exhibit well-densified NiTi–Nb walls surrounding interconnected pores created by the space-holder, with controlled fraction, size, and shape. Only small amounts of Nb (3 at.%) are needed to produce a eutectic liquid that considerably improves the otherwise poor densification of NiTi powders. NiTi–Nb foams with 34–44% porosity exhibit high compressive failure stress (>1,500 MPa), ductile behavior (>50% compressive strain), low stiffness (10–20 GPa), and large shape-memory recovery strains. These thermomechanical properties, together with the known biocompatibility of the alloy, make these open-cell foams attractive for bone implant applications.

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Zhang, X. P., H. Y. Liu, B. Yuan, and Y. P. Zhang. "Superelasticity decay of porous NiTi shape memory alloys under cyclic strain-controlled fatigue conditions." Materials Science and Engineering: A 481-482 (May 2008): 170–73. http://dx.doi.org/10.1016/j.msea.2007.02.147.

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Monroe, J. A., J. Cruz-Perez, C. Yegin, I. Karaman, A. B. Geltmacher, R. K. Everett, and R. Kainuma. "Magnetic response of porous NiCoMnSn metamagnetic shape memory alloys fabricated using solid-state replication." Scripta Materialia 67, no. 1 (July 2012): 116–19. http://dx.doi.org/10.1016/j.scriptamat.2012.03.038.

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Kim, Yeon-wook, Byeong-gu Jo, Sung Young, and Tae-hyun Nam. "Shape memory characteristics of porous Ti-Ni-Mo alloys prepared by solid state sintering." Materials Research Bulletin 82 (October 2016): 45–49. http://dx.doi.org/10.1016/j.materresbull.2016.03.007.

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Ashrafi, MJ, J. Arghavani, R. Naghdabadi, and F. Auricchio. "A three-dimensional phenomenological constitutive model for porous shape memory alloys including plasticity effects." Journal of Intelligent Material Systems and Structures 27, no. 5 (March 17, 2015): 608–24. http://dx.doi.org/10.1177/1045389x15575085.

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Ravari, Mohammad Reza Karamooz, Mahmoud Kadkhodaei, and Abbas Ghaei. "Effects of asymmetric material response on the mechanical behavior of porous shape memory alloys." Journal of Intelligent Material Systems and Structures 27, no. 12 (September 10, 2015): 1687–701. http://dx.doi.org/10.1177/1045389x15604232.

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