选取热暴露(700℃,10000 h)前、后的Ti-44.5Al-5Nb-1W-1B(摩尔分数,％)(5-1-1合金),对其表面引入不同深度的缺口(0～800μm),研究热暴露对该材料的疲劳性能及缺口损伤容限的影响,以Kitagawa-Takahashi线图的形式对热暴露引起的疲劳强化、长裂纹扩展门槛值以及合金在热暴露影响下对表面损伤的容忍限度进行定量分析.结果表明:热暴露导致的回火稳态良性效应大于合金显微组织出现脆化的有害效应,使得热暴露后无缺口样品出现疲劳强度提高,而α2层片分解和组织细化能适当提高疲劳长裂纹扩展门槛值.当在热暴露后引入缺口而无回火效应时,长期热暴露导致的组织脆化成为控制性因素,材料的缺口敏感性增加,表现为出现短缺口效应的尺寸范围在热暴露后明显增大.
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