研究了Ti-2Al-2.5Zr合金的高温(673K)低周疲行为,结果表明:Ti-2Al-2.5Zr合金的循环变形表现出初始硬化、随后软化和最后二次硬化的特征.在高温和较高应变幅((△εt/2)>1.0%)条件下,材料的疲劳寿命高于室温下的疲劳寿命.随着应变幅的提高,高温673 K材料疲劳变形后形成的位错组态由位错墙逐渐演变成成熟的位错胞.多系滑移开动和塑性变形均匀性增强是高温Ti-2Al-2.5Zr合金疲劳寿命提高的原因.
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