退火温度对Ti-51.1Ni形状记忆合金超弹性的影响
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摘要
用拉伸试验研究了退火温度(T_a)对Ti-51. 1Ni形状记忆合金超弹性的影响。结果表明:随T_a升高,Ti-51. 1Ni合金的应力诱发马氏体相变临界应力σ_M先降低后升高,极小值550 MPa在400℃退火后取得,极大值660 MPa在600℃退火后取得; 350～700℃退火态Ti-51. 1Ni合金的超弹性残余应变ε_r均较小(0. 27%～0. 36%);随应力-应变循环次数增加,350～700℃退火态Ti-51. 1Ni合金保持超弹性,应力应变滞后回线面积和ε_r减小,超弹性及其稳定性提高;要使该合金获得优异、稳定的超弹性,应对其进行500～600℃退火处理和应力-应变循环试验。
Effect of annealing temperature(T_a) on the superelasticity of Ti-51. 1 Ni shape memory alloy was investigated by tensile test. The results show that with increase of T_a,the critical stress of stress-induced martensitic transformation σ_M decreases firstly and then increases,the minimum of 550 MPa can be obtained when the alloy is annealed at 400 ℃,the maximum of 660 MPa can be obtained when the alloy is annealed at 600 ℃. The superelasticity residual strain ε_r of the Ti-51. 1 Ni alloy annealed at 350-700 ℃ is very small( 0. 27% ～ 0. 36%).With the increase of stress-strain cycling number,the Ti-51. 1 Ni alloy annealed at 350-700 ℃ keeps superelasticity,the hysteresis loop area of stress-strain cycles and ε_r decrease,and the superelasticity and its stability increase. In order to obtain excellent and stable superelasticity in the Ti-51. 1 Ni alloy,the annealing treatment at 500-600 ℃ and the stress-strain cycling test should be carried out for the alloy.
Effect of annealing temperature(T_a) on the superelasticity of Ti-51. 1 Ni shape memory alloy was investigated by tensile test. The results show that with increase of T_a,the critical stress of stress-induced martensitic transformation σ_M decreases firstly and then increases,the minimum of 550 MPa can be obtained when the alloy is annealed at 400 ℃,the maximum of 660 MPa can be obtained when the alloy is annealed at 600 ℃. The superelasticity residual strain ε_r of the Ti-51. 1 Ni alloy annealed at 350-700 ℃ is very small( 0. 27% ～ 0. 36%).With the increase of stress-strain cycling number,the Ti-51. 1 Ni alloy annealed at 350-700 ℃ keeps superelasticity,the hysteresis loop area of stress-strain cycles and ε_r decrease,and the superelasticity and its stability increase. In order to obtain excellent and stable superelasticity in the Ti-51. 1 Ni alloy,the annealing treatment at 500-600 ℃ and the stress-strain cycling test should be carried out for the alloy.
引文
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[3]Daghash S M,Ozbulut O E.Characterization of superelastic shape memory alloy fiber-reinforced polymer composites under tensile cyclic loading[J].Materials and Design,2016,111:504-512.
[4]He Zhirong,Liu Manqian.Effects of annealing and deforming temperature on microstructure and deformation characteristics of Ti-Ni-Vshape memory alloy[J].Materials Science and Engineering B,2012,177(12):986-991.
[5]Jani J M,Leary M,Subic A,et al.Review of shape memory alloy research,applications and opportunities[J].Materials and Design,2014,56(4):1078-1113.
[6]孟祥龙,蔡伟.Ti Ni基形状记忆材料及应用研究进展[J].中国材料进展,2011,30(9):13-20.Meng Xianglong,Cai Wei.Development of Ti-Ni-based shape memory materials and their applications[J].Materials China,2011,30(9):13-20.
[7]贺志荣.Ti Ni形状记忆合金的工程应用研究现状和展望[J].材料导报,2005,19(4):50-53.He Zhirong.Engineering application research status and development prospect of Ti Ni shape memory alloy[J].Materials Review,2005,19(4):50-53.
[8]Wang Qi,He Zhirong,Liu Manqian,et al.Effects of Ni content and solution-aging treatment on multi-stage transformations of Ti Ni shape memory alloys[J].Rare Metal Materials and Engineering,2011,40(3):395-398.
[9]Ezaz T,Wang J,Sehitoglu H,et al.Plastic deformation of Ni Ti shape memory alloys[J].Acta Materialia,2013,61:67-78.
[10]贺志荣,王芳,周敬恩.Ni含量和热处理对Ti Ni形状记忆合金相变和形变行为的影响[J].金属热处理,2006,31(9):17-21.He Zhirong,Wang Fang,Zhou Jing’en.Effect of Ni content and heat treatment on transformation and deformation behavior of Ti Ni shape memory alloys[J].Heat Treatment of Metals,2006,31(9):17-21.
[11]Fei Jiang,Liu Yinong,Yang Hong,et al.Effect of ageing treatment on the deformation behaviour of Ti-50.9 at.%Ni[J].Acta Materialia,2009,57(16):4773-4781.
[12]He Zhirong,Wang Fang.Sequence of phase transformations and microstructure of Ti-Ni alloy rich in nickel with shape memory effect after heat treatment[J].Metal Science and Heat Treatment,2014,56(5/6):320-325.
[13]杨军,贺志荣,王芳,等.Cr掺杂对Ti-Ni形状记忆合金相变和循环形变特性的影响[J].金属学报,2011,47(2):157-162.Yang Jun,He Zhirong,Wang Fang,et al.Effects of Cr addition on transformation and cyclic deformation characteristics of Ti-Ni shape memory alloy[J].Acta Metallurgica Sinica,2011,47(2):157-162.
[14]Han Fang,Wong M B,Bai Y,et al.Effect of heating/cooling rates on the material properties of Ni Ti wires for civil structural applications[J].Construction and Building Materials,2015,101:447-455.
[15]贺志荣,刘曼倩,王芳,等.时效工艺对Ti-Ni-V形状记忆合金组织和超弹性的影响[J].中国有色金属学报,2013,23(5):1301-1306.He Zhirong,Liu Manqian,Wang Fang,et al.Effect of aging process on microstructure and superelasticity of Ti-Ni-V shape memory alloy[J].The Chinese Journal of Nonferrous Metals,2013,23(5):1301-1306.