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黄彦彦,周青华,刘青,蔡聪德.镍基高温合金长时效下两相分离行为研究[J].稀有金属材料与工程(英文),2018,47(1):261~266.[HUANG YANYAN,ZHOU QINGHUA,LIU QING and CAI CONGDE.Study on Phase Separation of a Ni-based Superalloy after Long-time Aging[J].Rare Metal Materials and Engineering,2018,47(1):261~266.]
Study on Phase Separation of a Ni-based Superalloy after Long-time Aging
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Received:November 27, 2015  Revised:May 13, 2016
Key words: Ni-based superalloy  atom probe tomography  elements distribution  strengthening
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目);中央高校基本科研业务费资助
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      Distribution of alloying elements of a Ni-based superalloy after long-time aging is studied employing LEAP 4000X Si. Elements like Ni, Cr and Re preferentially partition to the γ phase, while Al and W have a preference for γ" phase. A local accumulation of Ni is found on the matrix side at the γ/γ" interface, leading to a reduction of interfacial free energy. The sum solute elemental concentrations of ~25 at.% and the experimental partial RDFs of Al-R (R=Re, Ru or W) exhibiting negative correlation at first-NN distances in precipitates indicate that refractory elements substitute preferentially to the Al sublattice sites. The solid-solution strengthening effect of refractory elements and the increase in precipitates volume fraction result in an increase in microhardness, compared to the base Ni-Al-Cr alloy.