对上限温度为500、650、800℃高温短时热循环200次后的Ti-6A14V合金室温力学性能和组织进行了研究。结果表明：循环温度对合金强度影响较为明显，循环温度的升高使合金抗拉强度降低；分析认为：温度高于650℃，实验合金组织中B相逐渐分解碎化，B相含量减少和a晶粒逐渐长大是强度降低的主要原因。
Microstructure and tensile properties of Ti-6A1-4V alloy after thermal cycling in the temperature range of room temperature to 500 ℃ , 650 ℃ and 800 cC were studied. The results show that with increasing of thermal cycling temperature, tensile strength of Ti-6A1- 4V alloy decreases, β phase disintegrates and its volume fraction is reduced, and ct grain grows gradually. It is argued that when cycling temperature below 650 ℃ , the disintegration of β phase is responsible for the strength decreasing and when temperature above 650 ℃ , the strength decreasement is ascribed to the decrease of β phase amount and ot grains growth.
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