近β马氏体钛合金中的β→ω相变  

Beta to Omega Transformation in Near Beta Metastable Titanium Alloys

作　　者：秦冬阳[1,2] 卢亚锋[2] 刘茜[3] 周廉[2] 

机构地区：[1]西安交通大学金属材料强度国家重点实验室,西安710049 [2]西北有色金属研究院,西安710016 [3]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050

出　　处：《材料导报》2012年第5期101-104,123,共5页Materials Reports

基　　金：国家科技支撑计划课题(2007BAE07B01)

摘　　要：近β马氏体钛合金的典型热处理制度为固溶时效,该类钛合金在水冷条件下会发生β→ω相变,该相变属于无扩散型相变,相变的形核源于母相(111)晶面的弹性位移重组,而后续时效过程是扩散型相变,其中强化相α相的析出与ω相的体积分数和形貌密切相关。综述了β→ω相变的相变机理和几种典型近β马氏体钛合金中的β→ω相变特点,总结了水冷态近β马氏体钛合金的电子衍射花样的规律。The solution-aging is the heat treatment method for near beta titanium alloys. After solution the beta to omega transformation occurs due to the vibration of the lattice and the collapse of the （111） plane in the parent phase. During aging the precipitation of alpha phase which acts as an enforce phase in near beta titanium alloys strong- ly depends on volume fraction and morphology of the omega phase, which is diffusion controlled transformation. The mechanism of beta to omega transformation is interpreted, and the electron diffraction pattern of some typical water quenched near beta titanium alloy is summarized.

关 键 词：钛合金 相变 Ω相 电子衍射 

分 类 号：TG146.23[一般工业技术—材料科学与工程]