长期时效过程中GH625合金的析出相演变  

Evolution of precipitated phase in GH625 alloy during long term aging

作　　者：李亚敏[1] 朱瑞明 刘洪军[1] 丁雨田[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《金属热处理》2017年第9期94-99,共6页Heat Treatment of Metals

基　　金：甘肃省科技重大专项项目(145RTSA004)

摘　　要：采用扫描电镜和能谱对720℃长期时效后GH625合金的析出相进行了研究并测试了其拉伸性能。结果表明:长时时效促进了合金中γ相→γ″相→δ相的转变,5×10~3h时效后合金中析出了大量的δ相;析出相提高了时效态合金的屈服强度和抗拉强度但降低了合金的塑性。当γ″相的尺寸超过500 nm后对合金的塑性不利,而大量δ相的析出则严重降低了合金的塑性。Precipitated phases of GH625 alloy were investigated after long term aging at 720 ℃ by means of energy-dispersive spectrometry （EDS） analyses and scanning eleetron microscopy （SEM） analyses, and the tensile properties of the alloy were tested. The results show that long term aging can promote γ phase→γ″ phase→δ phase transformation and a large amount of δ phase is precipitated after long term aging for 5 × 103 h. The precipitated phase can improve the yield strength and tensile strength of the alloy but reduce the plasticity. The plasticity of the alloy reduces after the size of γ″ phase larger than 500 nm, while large amount of precipitation of the δ phase severely reduces the plasticity of the alloy.

关 键 词：GH625合金 γ″相 Δ相 拉伸性能 

分 类 号：TG156.92[金属学及工艺—热处理]