TC21合金相变点的测定方法比较及相变过程中的热膨胀行为
Determination of Phase Transition Temperature and Thermal Expansion
刘竞艳, 张建国, 陈艳霞, 宋全超
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作者单位：西北工业大学 材料学院, 陕西 西安 710072
中文关键字：TC21； 相变点； 热机械分析
英文关键字：TC21; phase transition temperature; TMA
中文摘要：分别采用计算法、组织分析计算法和连续升温金相法测定了TC21合金板材的β相转变温度，并采用热机械分析法对该合金的相变过程进行了研究。结果表明：金相法得到的相变点最为准确，TC21合金板材的相变点为950～955 ℃，而计算法和组织分析计算法得到的相变点温度仅可作为参考。TMA曲线表明，该材料在此相变过程中体积逐渐减小，而当相变完成后体积不再发生任何变化。
英文摘要：The phase transition temperature of TC21 titanium alloy was determined by calculation method, microstructural analysis and continuous heating metallographic method. Besides these, the phase transition processing was studied by thermal mechanical analysis. The results show that the optimum phase transition temperature (Tβ) of TC21 titanium alloy is 950 ℃～955 ℃. The phase transition temperature predicted by calculation method and microstructural analysis can be used as a reference. TMA results reveal that the volume decreases as the temperature increasing during the phase transition processing. When this phase transition completes, no obvious volume change can be found.