【作者】 罗兵辉； 欧阳盛；

【Author】 Ouyang Sheng;LUO Bing-hui;Department of Materials Science and Engineering,Central South University;

【机构】 中南大学材料科学与工程学院；

【摘要】 室温下Ti₅₀Ni₄₅Cu₅基体为马氏体,Ti₄₅Ni₅₅Cr_0.3基体为奥氏体与马氏体（R相）,Ti₄₅Ni₅₂Fe₃为奥氏体。通过内耗.温度谱测试得出:三种合金固溶态的升温相变内耗峰峰温分别为,74.5℃、26.49℃、-5.35℃,降温相变内耗峰峰温分别为,45.0℃、-7.85℃、-36.22℃。25%冷变形+400℃/1h退火Ti₅₀Ni₄₅Cu₅合金室温组织含有大量位错及孪晶马氏体,具有良好的塑性,升\降温过程发生中B2→M相变。375℃/1h时效Ti₄₅Ni₅₅Cr_0.3合金析出Cr3Ni2粒子,强化了其力学性能,升温过程发生B2→M相变,降温过程中发生B2→R→M相变。25%冷变形+400℃/1h退火Ti₄₅Ni₅₂Fe₃合金析出Ti₃Ni₄相,升温过程发生B2→M相变,降温过程中发生B2→R→M相变。更多还原

【Abstract】 The microstructure,properties and phase transformation behaviors of Ti-Ni-X（Cu,Cr,Fe） alloys were investigated in this paper.It can be found that at room temperature the matrix of Ti₅₀Ni₄₅Cu₅ was austenite and Ti₄₅Ni₅₅Cr_0.3’s matrix was a mixture of austensite and martensite（R phase）,while the matrix of Ti₄₅Ni₅₂Fe₃ is pure austensite.Through Tanδ and storage modulus vs.the temperature curves,it can be found that the peak temperatures of the three alloys were 45.0 ℃,-7.85 ℃,-36.22 ℃.25%Cold-rolled +400℃/1h annealed Ti₅₀Ni₄₅Cu₅ contained dislocations and twin matensite,which accounted for its better plasticity.B2→M phase transformation took place upon heating\cooling.Ti₄₅Ni₅₅Cr_0.3 aged at 375℃/1h had a matrix dotted with Cr₃Ni₂ precipitates,which greatly enhanced its mechanical properties.B2→M phase transformation took place upon heating,while B2→R→M phase transformation took place upon cooling.Ti₃Ni₄ precipitated in 25%cold-rolled +400℃/1h annealed Ti₄₅Ni₅₂Fe₃ and led to a B2→R→M transformation upon cooling.更多还原