研究TC4合金经过800 ℃热循环后的组织和力学性能.结果表明:循环次数对合金的性能影响显著,随着循环次数的增加,合金的强度和塑性均开始下降;其中,合金热循环5次后强度下降迅速,随着循环次数的增加合金强度和塑性下降速度有所减缓.分析认为:在0～5次循环区间内,引起强度迅速下降的主要原因是由于组织中β相减少,5～100循环区间内强度下降主要是由于组织变化和合金表面氧化共同引起,而100～200次热循环区间强度下降主要由表面氧化所致.
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