Two-phase model calculation of diffraction elastic constant of crystal plane at different temperature
XU Haifeng1,3, ZHU Changjun1,2,3, CHEN Kanghua1,2,3, LIU Li1,3
1. Light Alloy Research Institute, Central South University, Changsha 410083, China; 2. National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, China; 3. Collaborative Innovation Center of Advance Nonferrous Structural Materials and Manufacturing, Central South University, Changsha 410083, China
Abstract：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.
许海峰, 祝昌军, 陈康华, 刘力. 不同温度下晶面衍射弹性常数的两相模型计算[J]. 粉末冶金材料科学与工程, 2020, 25(2): 91-97.
XU Haifeng, ZHU Changjun, CHEN Kanghua, LIU Li. Two-phase model calculation of diffraction elastic constant of crystal plane at different temperature. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 91-97.
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2020, Vol. 25 
