Interfaces in a modified inconel 718 with compact precipitates
Interfaces in a modified inconel 718 with compact precipitates
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DOI：
10.1016/s1359-6454(97)00221-8
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发表时间：
1998-12-19
期刊：
影响因子：
9.4
通讯作者：
Yokogawa, K
中科院分区：
文献类型：
--
作者：
He, J;Han, G;Yokogawa, K
用高分辨电子显微镜研究了含有致密析出物的改性Inconel718合金的界面。结果表明，致密析出物的形态和结晶学特征为立方的伽马‘相，六个面都覆盖有一个薄壳，在基体的{001}面上可分为三种不同的圆盘状的伽马“相，三种不同的伽马”相的[001]取向(c轴)平行于基体的[001]、[010]和[100]取向。γ“相/基体、γ‘相/基体、γ”相/γ’相界面是完全立方共格的，界面两侧的原子完全匹配，没有无序结构过渡区。研究表明，变质Inconel718合金比常规Inconel718合金具有更高的热稳定性，这是由于致密的析出相的形态结构以及伽马‘析出物、伽马“析出物和基体之间的完全共格界面所致。
Interfaces in a modified Inconel 718 containing compact precipitates were investigated using high resolution transmission electron microscopy. Morphology configuration and crystallography of the compact precipitate were confirmed as cube-shaped gamma' precipitate and ail six faces were coated with a thin shell, these shells could be classified as three variants of disc-shaped gamma " precipitates on {001} planes of the matrix, and the [001] orientations (c-axis) of the three variants of gamma " precipitate shells were parallel to [001], [010] and [100] orientations of the matrix. The interfaces of gamma " precipitate/matrix, gamma' precipitate/matrix, and gamma " precipitate/gamma' precipitate were fully cube-cube coherent, and the atoms at both sides of the interfaces maintained a perfect match with no disordered structure transition region. It was suggested that the higher thermal stability of the modified Inconel 718 alloy than that of conventional Inconel 718 alloy was due to the morphology configuration of the compact precipitate and fully coherent interfaces among the gamma' precipitate, gamma " precipitate and matrix. (C) 1997 Acta Metlallurgica Inc.