Mechanism of α-Cr precipitation and crystallographic relationships between α-Cr and δ phases in Inconel 718 alloy after long-time thermal exposure |
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作者姓名: | Zhong-nan Bi Jian-xin Dong Mai-cang Zhang Lei Zheng Xi-shan Xie |
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作者单位: | School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China |
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基金项目: | This work was financially supported by the National Natural Science Foundation of China |
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摘 要: | To study the precipitation mechanism of α-Cr phase in Inconel 718 alloy, the samples after long-time aging at 650 and 677℃ were examined by microstructural observations and chemical phase analysis methods. Combining the thermodynamics and kinetics calculation results, α-Cr always precipitates in the vicinity of δ phase, because δ phase rejects Cr into the γ-matrix when growing. The selected area diffraction patterns confirm that the crystallographic relationships of α-Cr with δ phase are (010)δ//(1 10)α-Cr and 100]δ//111]α-Cr. A graphic model is also presented to show the crystallographic relation between α-Cr and δ phases.
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关 键 词: | Inconel 718 precipitation mechanism crystallography thermodynamics kinetics |
收稿时间: | 19 February 2007 |
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