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首页> 外文期刊>Philosophical Magazine Letters >Element migration during stress rafting of gamma '-Co-3(Al, W) precipitates
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Element migration during stress rafting of gamma '-Co-3(Al, W) precipitates

机译:应力漂流的元素迁移γ-Co-3(Al,W)沉淀物

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摘要

Rafting is a distinct characteristic of superalloys strengthened by L1(2)-gamma ' precipitates. Element migration during rafting of Co-10Al-7W (at.%) alloy is here investigated by phase-field simulation. The rafting direction is along the gamma matrix channel with the higher Von Mises equivalent stress. In the gamma channel, the compressive stress drives atoms of large size to migrate into a vertical channel with small elastic energy density under tensile strain, and the boundary dissolution of gamma ' supplies solute atoms for the gamma ' rafting connection in Co-Al-W-based superalloys. The junctions start at the corners of the gamma ' precipitates where the larger stress is. Strain energy changes the compositions of gamma and gamma ' phases and results in an increase of lattice mismatch.
机译:漂流是L1(2)-γ'沉淀物强化的超合金的明显特征。 通过相场模拟研究了CO-10AL-7W(AT。%)合金的漂流期间的元素迁移。 漂流方向沿着伽马矩阵通道,具有较高的von MISS等效应力。 在伽马通道中,压缩应力驱动大尺寸的原子以在拉伸应变下迁移到具有小弹性能量密度的垂直通道中,并且γ'为CO-AL-W中的γ'漂流连接提供溶质原子的边界溶解 基于高温合金。 连接在γ'沉淀物的角落处开始,其中较大的应力是。 应变能量改变γ和γ'阶段的组成,并导致格子错配的增加。

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