Nano γ′/γ″ composite precipitates in Alloy 718
Nano γ′/γ″ composite precipitates in Alloy 718
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DOI：
10.1063/1.4721456
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发表时间：
2012-05
影响因子：
4
通讯作者：
P. Phillips;D. McAllister;Yipeng Gao;D. Lv;R. Williams;B. Peterson;Y. Wang;M. Mills
中科院分区：
文献类型：
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作者：
P. Phillips;D. McAllister;Yipeng Gao;D. Lv;R. Williams;B. Peterson;Y. Wang;M. Mills
合金 718 的纳米级复合析出物已通过高分辨率扫描透射电子显微镜和相场建模进行了研究。通过能量色散 X 射线光谱进行的化学分析可以区分 γ' 和 γ" 粒子，而这是传统 Z 对比方法无法实现的。应用相场建模分别确定颗粒周围和颗粒之间的应力分布和弹性相互作用，并确定复合颗粒（γ'和γ”）的弹性能明显低于例如非相互作用的单个γ'和γ”沉淀物。
Nanoscale composite precipitates of Alloy 718 have been investigated with both high-resolution scanning transmission electron microscopy and phase field modeling. Chemical analysis via energy-dispersive x-ray spectroscopy allowed for the differentiation of γ′ and γ″ particles, which is not otherwise possible through traditional Z-contrast methods. Phase field modeling was applied to determine the stress distribution and elastic interaction around and between the particles, respectively, and it was determined that a composite particle (of both γ′ and γ″) has an elastic energy that is significantly lower than, for example, single γ′ and γ″ precipitates which are non-interacting.