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Plastic strain-induced evolution of CSL boundaries at elevated temperature for Ni-base superalloy: experimental and phase-field perspective
Journal of Materials Research and Technology ( IF 6.2 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.jmrt.2019.12.084
Xiaoqing Song , Liying Tang , Yongxin Wang , Rongcan Zhou , Jing Zhang , Zheng Chen

Samples cut from a 700 ℃/322 MPa/9117 h creep-ruptured specimen as well as a non-tested sample were characterized by electron backscatter diffraction to investigate the evolution of low ∑ (∑≤29) coincident site lattice boundaries during strain at elevated temperature for Haynes 282 superalloy. Results show that the proportion of ∑3 boundaries, including ∑9 and ∑27 boundaries, decreases sharply with increasing strain. The two-mode phase-field crystal method is applied to simulate the dynamic evolution process of a ∑3 boundary. During deformation at ε´=5.62e-6, a twin embryo grows toward the initial ∑3 boundary with increasing strain and impinges onto it finally to form a ∑3-∑3-∑9 triple junction. In addition, part of the initial ∑3 boundary transforms into random grain boundary when the strain is large enough. Large numbers of dislocations are detected nearby ∑3 boundaries. They cause severe lattice rotations near ∑3 boundaries. In addition, some straight random boundaries can be found in strain zones only. Therefore, the transformation of ∑3 boundaries into random grain boundaries is the critical reason for the sharp decrease of ∑3 boundaries in strain zones.



中文翻译:

镍基高温合金在高温下塑性应变诱导的CSL边界演化:实验和相场视角

通过电子反向散射衍射对从700℃/ 322 MPa / 9117 h蠕变断裂的样品以及未经测试的样品上切下的样品进行表征,以研究高应变时低∑(∑≤29)重合位点晶格边界的演化。 Haynes 282高温合金的最高温度。结果表明,随着应变的增加,Σ3边界的比例(包括Σ9和Σ27边界)急剧减小。应用双模相场晶体方法模拟了∑3边界的动态演化过程。在变形期间ε´=5.62Ë--6,双胞胎胚胎随着应变的增加而朝着最初的Σ3边界生长,并撞击到其上,最终形成一个∑3-∑3-∑9三重连接。另外,当应变足够大时,初始∑3边界的一部分转换为随机晶界。在∑3边界附近检测到大量位错。它们会导致Σ3边界附近的严重晶格旋转。另外,仅在应变区域中可以找到一些直线随机边界。因此,将∑3边界转变为随机晶界是导致应变区∑3边界急剧减小的关键原因。

更新日期:2020-01-09
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