用TEM和拉伸实验研究了时效工艺对Ti-50.8Ni-0.1Zr形状记忆合金显微组织、拉伸性能和形状记忆行为的影响。300、400和500℃时效态Ti-50.8Ni-0.1Zr合金中Ti₃Ni₄析出相分别呈颗粒状、透镜状和长条状，时效温度比时效时间对析出相形态、尺寸和弥散度的影响更大。时效处理后合金的强度升高，塑性降低。随时效时间(t_ag)延长，300℃时效态合金抗拉强度(R_m)升高，断后伸长率(A)降低；400℃时效态合金R_m先升后降，A先降后升；500℃时效态合金R_m降低，A升高。300℃时效1~50 h和400℃时效1 h的合金呈现良好的超弹性，400℃时效5~50 h和500℃时效1~50 h的合金呈现良好的形状记忆效应。随t_ag延长，300℃时效态合金的应力诱发马氏体相变临界应力降低，能耗升高；400和500℃时效态合金的马氏体再取向应力和能耗均降低。

To improve the properties of Ti-Ni shape memory alloys (SMAs), a third element can be added to them and assisted by a heat treatment process. After the Ni-rich Ti-Ni SMAs are doped with a small amount of Zr, the parent phase of the alloy is observed to exhibit enhanced stability; further, the alloys exhibit improved yield strength, elongation, and memory performance. The effects of the composition and annealing processes on the phase transformation behaviors and mechanical properties of the Ti-Ni-Zr SMAs have been studied; however, the microstructure, tensile properties, and shape memory behaviors of the aged Ti-Ni-Zr SMAs remain to be investigated. In this work, a Ni-rich Ti-50.8Ni-0.1Zr alloy could be obtained by doping the Ti-Ni alloys with 0.1%Zr (atomic fraction). The effects of the ageing processes on the microstructure, tensile properties, and shape memory behaviors of the alloy were investigated through TEM and tensile tests. The Ti₃Ni₄ precipitates in the Ti-50.8Ni-0.1Zr alloy samples aged at 300, 400, and 500^oC exhibit morphologies of fine particles, lenticular particles, and long strips, respectively. The effect of ageing temperature on the morphology, size, and dispersion of precipitates is greater than that of the ageing time. The alloy exhibited enhanced strength but reduced ductility after the ageing treatment. With the increasing ageing time (t_ag), the tensile strength (R_m) increased and the percentage elongation (A) decreased when considering the alloy sample aged at 300^oC. In case of the alloy sample aged at 400^oC, R_m initially increased and subsequently decreased, whereas A initially decreased and subsequently increased. The alloy sample aged at 500^oC exhibited a reduced R_m but an enhanced A. The alloy samples aged at 300^oC for 1-50 h or at 400^oC for 1 h exhibited superelasticity, whereas those aged at 400^oC for 5-50 h or 500^oC for 1-50 h exhibited the shape memory effect. In the alloy samples aged at 300^oC, higher t_ag values resulted in enhanced energy dissipation and lower critical stress values for stress-induced martensite transformation. Alloy ageing at 400^oC or 500^oC resulted in lower critical stress values for martensite reorientation and lower energy dissipation.