不同温度下晶面衍射弹性常数的两相模型计算  

Two-phase model calculation of diffraction elastic constant of crystal plane at different temperature

作　　者：许海峰 祝昌军 陈康华[1,2,3] 刘力 XU Haifeng;ZHU Changjun;CHEN Kanghua;LIU Li(Light Alloy Research Institute,Central South University,Changsha 410083,China;National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials,Central South University,Changsha 410083,China;Collaborative Innovation Center of Advance Nonferrous Structural Materials and Manufacturing,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学轻质高强结构材料国防科技重点实验室,长沙410083 [3]中南大学有色金属先进结构材料与制造协同创新中心,长沙410083

出　　处：《粉末冶金材料科学与工程》2020年第2期91-97,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国家自然科学基金重大科研仪器设备研制专项(51327902);国家重点研发计划资助项目(2016YFB0300801)。

摘　　要：将镍基高温合金看成基体相γ相(Ni相)和夹杂相γ′相(Ni3Al相)的两相材料(忽略少量的其他相),利用Eshelby夹杂理论和自洽方法,建立计算两相材料晶面衍射弹性常数的两相模型。再通过准谐德拜理论和第一性原理计算,获得高温下两相单晶体的弹性刚度系数,代入模型计算镍基高温合金相关晶面在不同温度下的衍射弹性常数。计算结果与文献报道的实验测量值误差较小,验证了模型的准确性。Nickel-based superalloy can be regarded as a two-phase material with matrix phase(Ni phase)and mixed phase(Ni3Al phase)(ignoring a few other phases).A two phase model for calculating diffraction elastic constant is established by self-consistent way,combined with Eshelby inclusion theory.The elastic stiffness coefficient of two-phase single crystal at high temperature is obtained by quasi harmonic Debye theory and first principle calculation,and the diffraction elastic constants of related crystal surfaces of nickel base superalloy at different temperatures are calculated by substituting the model.The accuracy of the model is verified by the small error between the calculated results and the experimental measurements reported in the literature.

关 键 词：应力 镍基高温合金 两相 弹性常数 温度 

分 类 号：TG115.23[金属学及工艺—物理冶金] TB35[金属学及工艺—金属学]