对淬火态和时效态的ＴＣ４钛合金在－１９６－３５０℃进行了热循环试验，并测定了合金热循环前后的机械性能．结果表明：经热循环后，合金的塑性下降；时效态的合金，强度变化较小．而淬火态的合金，强度先显著上升，经３０００次热循环后，合金的强度又有所下降．用透射电镜分析了合金热循环前后的组织，讨论了热循环对显微组织和机械性能的影响．
The thermal cycling tests between -196 and 350 ℃ were performed on Ti-6Al-4V alloy in as-quenched and aged states, and the tensile properties before and after thermal cycling were evaluated. The elongation of the as-quenched or aged alloy decreases after thermal cycling. The strength of the aged alloy does not change significantly, and that of the as-quenched alloy promptly increases first, and then falls down after 3000 thermal cycles.Microstructural analysis was performed by TEM before and after thermal cycling. The effects of thermal cycling on microstructure and tensile properties were discussed.Correspondent: GENG Hongbin,(College of Materials and Engineering, Harbin Institute of Technology,Harbin 150001)
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