近α型高温钛合金长期时效过程中的组织演化行为Microstructure evolution behavior of near alpha type high temperature titanium alloy during long-term aging
王佳晨,王磊,宋秀,刘杨,朱旭晖
摘要(Abstract):
利用光学显微镜、扫描电镜和透射电镜研究了Ti600高温钛合金在550℃长期时效至2000 h过程中的微观组织演化行为与机理。结果表明:Ti600合金在550℃长期时效下稀土相较为稳定,但α_2相和硅化物S_2相析出并逐渐长大。0~500 h的时效初期,随时效时间的增加,与基体共格的球状α_2相的尺寸和数量增加,但当时效至500 h后,α_2相的析出与长大趋于稳定,时效至2000 h, α_2相的尺寸仍保持在10 nm以内。硅化物S_2相在α片层与β相界面或α相内析出,且当时效时间超过200 h后其长大逐渐明显,并且沿着长轴方向生长使其形状逐渐向棒状转变。时效至2000 h,合金中S_2相的平均尺寸已经达到约175 nm。经计算,550℃长期时效S_2相的长大速率K=2.69×10~3 nm~3·h~(-1)。其中Zr的扩散主要控制S_2相的长大。
关键词(KeyWords): 近α钛合金;热处理;长期时效;硅化物;α_2相
基金项目(Foundation): 辽宁省自然科学计划基金面上项目(2022-MS-113);; 中央高校基本科研业务专项资金资助(N2302005)
作者(Author): 王佳晨,王磊,宋秀,刘杨,朱旭晖
DOI: 10.13289/j.issn.1009-6264.2023-0470
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