镍钛形状记忆合金热机械循环变形行为试验研究
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摘要
镍钛形状记忆合金在应用过程中,不可避免地承受热机械循环载荷作用,进而导致材料的结构性和功能性疲劳失效。热力学循环变形试验在自主开发的热机械循环试验平台上开展,并实时采集力、位移和温度信号,提取循环应力、应变和温度演化曲线,研究热机械循环变形对形状记忆效应的劣化作用。试验结果表明:机械循环载荷将轻微降低镍钛形状记忆合金在升温过程中的应变回复能力;同时,形状记忆效应随着热机械循环和温度循环次数的增加出现显著劣化。研发的热机械循环变形试验平台可用于揭示镍钛形状记忆合金功能性退化机理,为进一步对形状记忆合金器件的性能评估提供有益参考。
NiTi shape memory alloy is often subjected to the thermo-mechanically cyclic loadings in applications,which leads to structural and functional fatigue failures of the alloy. The thermo-mechanically cyclic deformation tests were carried out by using the self-developed thermo-mechanically cyclic test platform; the signals of force,displacement and temperature were collected in real time. By extracting the evolution curve of cyclic stress,strain and temperature,the influences of the thermo-mechanically cyclic deformation on shape memory effect were investigated. Results show that a pre mechanically cyclic loading reduces slightly the strain recovery capacity during heating process,but the shape memory effect decreases remarkably with the increasing number of cyclic under the thermo-mechanically cyclic loading and temperature cycling loading. The developed platform using for the test of thermo-mechanically cyclic deformation can be used to indicate the functional degradation mechanism of NiTi shape memory alloy. It is a useful reference for the further performance evaluation of shape memory alloy based devices.
NiTi shape memory alloy is often subjected to the thermo-mechanically cyclic loadings in applications,which leads to structural and functional fatigue failures of the alloy. The thermo-mechanically cyclic deformation tests were carried out by using the self-developed thermo-mechanically cyclic test platform; the signals of force,displacement and temperature were collected in real time. By extracting the evolution curve of cyclic stress,strain and temperature,the influences of the thermo-mechanically cyclic deformation on shape memory effect were investigated. Results show that a pre mechanically cyclic loading reduces slightly the strain recovery capacity during heating process,but the shape memory effect decreases remarkably with the increasing number of cyclic under the thermo-mechanically cyclic loading and temperature cycling loading. The developed platform using for the test of thermo-mechanically cyclic deformation can be used to indicate the functional degradation mechanism of NiTi shape memory alloy. It is a useful reference for the further performance evaluation of shape memory alloy based devices.
引文
[1]MIYAZAKI S,OTSUKA K.Deformation and transition behavior associated with the R-phase in Ti-Ni alloys[J].Metallurgical Transactions A,1986,17(1):53-63.
[2]NEMAT-NASSER S,GUO W G.Superelastic and cyclic response on Ni Ti SMA at various strain rates and temperatures[J].Mechanics of Materials,2006,38(5-6):463-474.
[3]罗洪艳,牟波,廖彦剑,等.热机械循环方法对训练Ni Ti合金双程形状记忆效应的影响[J].材料导报,2009,23(12):55-58.
[4]谭冀,李艳锋,高宝东,等.热机械循环对Ti49.8Ni50.2形状记忆合金相变行为的影响[C]//中国有色金属学会第十二届材料科学与合金加工学术年会论文集,2007:284-288.
[5]SURESH K S,BHAUMIK S K,SUWAS S.Effect of thermal and thermo-mechanical cycling on the microstructure of Ni-rich Ni Ti shape memory alloys[J].Materials Letters,2013,99(20):150-153.
[6]ABBASI M,KERMANPUR A,EMADI R.Effects of thermo-mechanical processing on the mechanical properties and shape recovery of the nanostructured Ti50Ni45Cu5shape memory alloy[J].Journal of Experimental Zoology India,2015,11(1):61-66.
[7]SAIKRISHNA C N,RAMAIAH K V,BHAUMIK S K.Effects of thermo-mechanical cycling on the strain response of Ni-Ti-Cu shape memory alloy wire actuator[J].Materials Science&Engineering A,2006,428(1-2):217-224.
[8]LI Y F,MI X J,TAN J,et al.Thermo-mechanical cyclic transformation behavior of Ti-Ni shape memory alloy wire[J].Materials Science&Engineering A,2009,509(1-2):8-13.
[9]BO Z,LAGOUDAS D C.Thermo-mechanical modeling of polycrystalline SMAs under cyclic loading,Part III:Evolution of plastic strains and two-way memory effect[J].International Journal of Engineering Science,1999,37(9):1175-1203.
[10]KANG G Z,SONG D.Review on structural fatigue of Ni Ti shape memory alloys:Pure mechanical and thermomechanical ones[J].Theoretical and Applied Mechanics Letters,2015,5(6):245-254.
[11]TADAYYON G,MAZINANI M,GUO Y N,et al.The effect of annealing on the mechanical properties and microstructural evolution of Ti-rich Ni Ti shape memory alloy[J].Materials Science&Engineering A,2016,662:564-577.
[12]YU C,KANG G Z,KAN Q H,et al.Rate-dependent cyclic deformation of super-elastic Ni Ti shape memory alloy:thermo-mechanical coupled and physical mechanism-based constitutive model[J].International Journal of Plasticity,2015,72:60-90.
[2]NEMAT-NASSER S,GUO W G.Superelastic and cyclic response on Ni Ti SMA at various strain rates and temperatures[J].Mechanics of Materials,2006,38(5-6):463-474.
[3]罗洪艳,牟波,廖彦剑,等.热机械循环方法对训练Ni Ti合金双程形状记忆效应的影响[J].材料导报,2009,23(12):55-58.
[4]谭冀,李艳锋,高宝东,等.热机械循环对Ti49.8Ni50.2形状记忆合金相变行为的影响[C]//中国有色金属学会第十二届材料科学与合金加工学术年会论文集,2007:284-288.
[5]SURESH K S,BHAUMIK S K,SUWAS S.Effect of thermal and thermo-mechanical cycling on the microstructure of Ni-rich Ni Ti shape memory alloys[J].Materials Letters,2013,99(20):150-153.
[6]ABBASI M,KERMANPUR A,EMADI R.Effects of thermo-mechanical processing on the mechanical properties and shape recovery of the nanostructured Ti50Ni45Cu5shape memory alloy[J].Journal of Experimental Zoology India,2015,11(1):61-66.
[7]SAIKRISHNA C N,RAMAIAH K V,BHAUMIK S K.Effects of thermo-mechanical cycling on the strain response of Ni-Ti-Cu shape memory alloy wire actuator[J].Materials Science&Engineering A,2006,428(1-2):217-224.
[8]LI Y F,MI X J,TAN J,et al.Thermo-mechanical cyclic transformation behavior of Ti-Ni shape memory alloy wire[J].Materials Science&Engineering A,2009,509(1-2):8-13.
[9]BO Z,LAGOUDAS D C.Thermo-mechanical modeling of polycrystalline SMAs under cyclic loading,Part III:Evolution of plastic strains and two-way memory effect[J].International Journal of Engineering Science,1999,37(9):1175-1203.
[10]KANG G Z,SONG D.Review on structural fatigue of Ni Ti shape memory alloys:Pure mechanical and thermomechanical ones[J].Theoretical and Applied Mechanics Letters,2015,5(6):245-254.
[11]TADAYYON G,MAZINANI M,GUO Y N,et al.The effect of annealing on the mechanical properties and microstructural evolution of Ti-rich Ni Ti shape memory alloy[J].Materials Science&Engineering A,2016,662:564-577.
[12]YU C,KANG G Z,KAN Q H,et al.Rate-dependent cyclic deformation of super-elastic Ni Ti shape memory alloy:thermo-mechanical coupled and physical mechanism-based constitutive model[J].International Journal of Plasticity,2015,72:60-90.