镍基单晶合金初始细观结构及变形影响因素研究  

Initial Microstructure and Deformation Influence Factors of Ni-Base Single Crystal

作　　者：曹娟 

机构地区：[1]中航空天发动机研究院,北京100028

出　　处：《航空发动机》2013年第5期71-78,共8页Aeroengine

基　　金：国家自然科学基金(50571004);凡舟青年科研基金(20060404)资助

摘　　要：通过对国内外大量镍基单晶合金的细观试验现象及结论进行分析,给出了单晶合金细观2相结构的主要变形特征,并研究得到影响单晶合金初始细观结构及其变形的3个因素分别为γ′初始尺寸、形状及γ/γ′初始错配度。结果表明:在高温、较高应力的条件下,γ′的初始尺寸为0.45μm(γ′体积分数约为70%),初始形状为立方块且不发生任何预筏化,初始错配度为负且绝对值较大时,合金的综合力学性能最佳。The main deformation characteristics of dual-phase microstructure for Ni- base single crystal were obtained by analyzing a lot of tests phenomenon and results about microstructure of Ni base single crystal in the world. Three deformation influence factors of Ni- base single crystal that the initial dimensions of γ′, the initial shape of γ′ and the initialmisfit of γ′ were studied. The results show that under the condition of higher temperature and stress, the performances of Ni base single crystal are best when the initial dimensions of γ′ are 0.45 μm （the volume fraction of γ′ are nearly 70%）, the initial shape of γ′ are cubic without any pre-rafting and the initial misfit of γ′ are negative with relatively big absolute value.

关 键 词：镍基单晶合金 初始细观结构 变形 影响因素 

分 类 号：TG146.15[一般工业技术—材料科学与工程]