摘要
根据镍基单晶合金材料细观结构的定向特点，提出了分析蠕变第一阶段性能晶体取向相关性的细观单元模型。对由晶格错配度和热不协调性所产生的内应力进行了模型分析，用镍基单晶合金DD3单晶平板850和950℃实验测量了内应力的宏观响应，并在推导一解析解的基础上，确定模型参数.给合［001］，［011］，［111］取向圆棒拉伸试样试验和晶体滑移有限元蠕变分析表明，蠕变第一阶段的晶体取向相关性可以归于以下三个因素，即晶格错配度，热不协调性和材料细观组织结构的定向特点。此结论进一步得到一种带缺口剪切蠕变试验的验证.
A micromodel has been developed for the dependence of primary creep behavior on crystallographic orientations of nickel-base single crystal superalloys,the internal stresses resulting from the lattice misfit and thermal misfit are analyzed using the model,and the macro responses of the internal stresses are tested by plate specimens made of nickel-base single crystal DD3 at 850℃ and 950℃.The model parameters are then obtained using a derived analytical equations and crystallographic finite element method.The analyses of the tensile creep bars in [001],[011]and[111]crystallographic orientations shows that the dependence is due to lattice misfit,thermal misfit and directional arrangement of precipitation γ'. And this conclusion has also been verified by double shear creep deformation.
出处
《材料科学与工艺》
EI
CAS
CSCD
1998年第2期48-52,共5页
Materials Science and Technology
基金
国家自然科学基金!59501009
航空科学基础研究基金
西交大力学开放实验室基金
关键词
镍基单晶合金
蠕变
晶体取向相关性
镍合金
nickel-bse single crystal superalloy
primary creep behavior
dependence on the crystallographic orientations
lattice misfit
thermal misfit directional arrangement of precipitation
