Micromechanical behavior of single-crystal superalloy with different crystal orientations by microindentation

Jinghui Li, Fuguo Li, Junzhe Dong, Zhanwei Yuan, Shuo Zhang

科研成果: 期刊稿件文章同行评审

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摘要

In order to investigate the anisotropic micromechanical properties of single-crystal nickel-based superalloy DD99 of four crystallographic orientations, (001), (215), (405), and (605), microindentation test (MIT) was conducted with different loads and loading velocities by a sharp Berkovich indenter. Some material parameters reffecting the micromechanical behavior of DD99, such as microhardness H, Young's modulus E, yield stress Ωγ, strain hardening component n, and tensile strength Ωb, can be obtained from load-displacement relations. H and E of four different crystal planes evidently decrease with the increase of h. The reduction of H is due to dislocation hardening while E is related to interplanar spacing and crystal variable. Ωγ of (215) is the largest among four crystal planes, followed by (605), and (001) has the lowest value. n of (215) is the lowest, followed by (605), and that of (001) is the largest. Subsequently, a simplified elastic-plastic material model was employed for 3D microindentation simulation of DD99 with various crystal orientations. The simulation results agreed well with experimental, which confrmed the accuracy of the simplifed material model.

源语言英语
文章编号759753
期刊Journal of Nanomaterials
2015
DOI
出版状态已出版 - 2015

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