多孔Ti-51%Ni合金的压缩回弹性能
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摘要
以孔隙率为43%~58%的多孔Ti-51%Ni(原子分数)合金为研究对象,研究了其微观形貌、物相组成和相变特征,以及在不同压缩载荷下的压缩回弹性能,分析了其变形机制。结果表明:试验合金的孔隙分布比较均匀,孔隙率对其相组成和相变行为影响很小;在不同压缩载荷下存在线性超弹和平台锯齿两种变形机制;在线性超弹阶段,试验合金同时具备较高的压缩率和回弹率;在平台锯齿阶段,回弹能力几乎丧失。
Using the porous Ti-51% Ni(atom fraction)alloy with the porosities of 43%-58% as the research object,the micromorphology,phase composition,phase transformation behavior,and the compression and recovery properties under different compressive loads of the alloy were investigated.And the deformation mechanism was analyzed.The results show that the pores in the tested alloy distributed homogeneously.The porosity had little influence on the phase composition and phase transformation behavior.Two deformation mechanisms,namely the linear superelasticity and the saw-tooth plateau,were found under different compressive loads.At the stage of linear superelasticity,the tested alloy had relatively high compressibility and high recovery rate while almost lost the recovery ability at the stage of saw-tooth plateau.
Using the porous Ti-51% Ni(atom fraction)alloy with the porosities of 43%-58% as the research object,the micromorphology,phase composition,phase transformation behavior,and the compression and recovery properties under different compressive loads of the alloy were investigated.And the deformation mechanism was analyzed.The results show that the pores in the tested alloy distributed homogeneously.The porosity had little influence on the phase composition and phase transformation behavior.Two deformation mechanisms,namely the linear superelasticity and the saw-tooth plateau,were found under different compressive loads.At the stage of linear superelasticity,the tested alloy had relatively high compressibility and high recovery rate while almost lost the recovery ability at the stage of saw-tooth plateau.
引文
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[3]TANAKA T,TAKADA T,KAWAMURA S,et al.Spiralshaped gasket using shape memory:JP04249587[P].1994-04-12.
[4]TATSUOKA T,TAKAGI Y,SAWA T.Sealing performance of pipe flange connections with shape memory alloy gaskets under internal pressure[C]//ASME/JSME 2004 Pressure Vessels and Piping Conference.New York:ASME,2004:41-47.
[5]TAKAGI Y,TATSUOKA T,KAWASAKI N,et al.Stress analysis and sealing performance of pipe flange connections with NiTi shape memory alloy gasket[C]//ASME 2007Pressure Vessels and Piping Conference.New York:ASME,2007:209-216.
[6]TAKAGI Y,TATSUOKA T,SAWA T.The effect of the thermal expansion coefficient on the sealing performance of pipe flange connections with Ni-Ti shape memory alloy gaskets[C]//ASME 2006 Pressure Vessels and Piping Conference.New York:ASME,2006:161-168.
[7]EFREMOV A.Bolted flanged connection for critical engineering applications[C]//ASME 2006 Pressure Vessels and Piping Conference.New York:ASME,2006:103-110.
[8]诸士春,陆晓峰,巩建鸣.Al包覆层厚度对Al-NiTi复合垫片密封面压紧力影响的有限元分析[J].固体火箭技术,2012,35(5):683-687.
[9]XIONG J Y,LI Y C,WANG X J,et al.Titanium-nickel shape memory alloy foams for bone tissue engineering[J].Journal of the Mechanical Behavior of Biomedical Materials,2008,1(3):269-273.
[10]ISMAIL M H,GOODALL R,DAVIES H A,et al.Formation of microporous NiTi by transient liquid phase sintering of elemental powders[J].Materials Science and Engineering C,2012,32(6):1480-1485.
[11]XU J L,BAO L Z,LIU A H,et al.Effect of pore sizes on the microstructure and properties of the biomedical porous NiTi alloys prepared by microwave sintering[J].Journal of Alloys and Compounds,2015,645:137-142.
[12]袁斌,赖铭,梁锦霞,等.烧结时间对多孔NiTi形状记忆合金时效时马氏体相变的影响[J].机械工程材料,2011,35(1):6-10.
[13]YUAN B,ZHANG X P,CHUNG C Y,et al.The effect of porosity on phase transformation behavior of porous Ti-50.8at.%Ni shape memory alloys prepared by capsule-free hot isostatic pressing[J].Materials Science and Engineering A,2006,438/439/440:585-588.
[14]ZHU S,LU X,GONG J.Study on the compressive behavior of Ti-53.22at%Ni alloy sheets after pre-compression and aging treatments[J].Journal of Alloys and Compounds,2012,543(35):34-39.
[15]CHU C,CHUNG J,CHU P.Effects of heat treatment on characteristics of porous Ni-rich NiTi SMA prepared by SHS technique[J].Transactions of Nonferrous Metals Society of China,2006,16(1):49-53.
[16]ZHANG X P,LIU H Y,YUAN B,et al.Superelasticity decay of porous NiTi shape memory alloys under cyclic straincontrolled fatigue conditions[J].Materials Science and Engineering A,2008,481/482:170-173.
[17]GIBSON L J,ASHBY M F.Cellular solids:Structure and properties(Second Edition)[M].New York:Cambridge University Press,1997.
[18]黄婷.Nb含量和热处理对多孔NiTi(Nb)记忆合金超弹性行为的影响研究[D].广州:华南理工大学,2014.