【摘要】 利用扫描电子显微观察、透射电子显微观察、X射线衍射分析、差示扫描量热分析、硬度测试和弯曲测试研究了(Ni₅₀Ti₃₀Hf₂₀)₉₅V₅合金的显微组织、马氏体相变行为与形状记忆性能。结果表明，添加V可显著影响合金的显微组织。添加V会导致合金中形成室温下与B19′马氏体相共存的（Ni,V）₂（Ti,Hf）型Laves相。经550℃时效处理的合金表现出析出强化行为，这主要是因为合金中形成纳米尺寸的正交结构的H相。当时效时间为3 h时，合金表现出峰值硬度。与固溶态合金相比，时效态合金表现出较大的相变应变和较小的不可恢复应变，当外加应力为500 MPa时，合金达到最大相变应变，为1.56%。更多还原

【Abstract】 The effect of age hardening on the microstructure, martensitic transformation behavior, and shape memory properties of the(Ni₅₀Ti₃₀Hf₂₀)₉₅V₅ alloy was investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry, microhardness, and bending tests. The results demonstrate a significant influence of V addition on the microstructure of the alloy. V addition leads to the formation of a（Ni,V）₂（Ti,Hf）-type Laves phase, which coexists with B19’ martensite at room temperature. Aging at 550 ℃ results in precipitation hardening due to the formation of nano-scale orthorhombic H-phase, with the peak hardness observed after 3 h of aging. The alloy at peak hardness state exhibits higher transformation strain and lower unrecovered strain compared to the solution-treated sample. The aged sample achieves a maximum transformation strain of 1.56% under 500 MPa.更多还原