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,2018,47(1):261~266.[HUANG YANYAN,ZHOU QINGHUA,LIU QING,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.]
镍基高温合金长时效下两相分离行为研究
投稿时间:2015-11-27  修订日期:2016-05-13
中文关键词:  镍基高温合金  原子探针层析技术  元素分布  强化
基金项目: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
中文摘要:
      采用原子探针仪器LEAP 4000X Si,研究镍基高温合金Ni-Al-Cr-W-Re-Ru长期时效后的元素分布规律。结果表明,Ni、Cr和Re原子在无序γ(FCC)-基体相中富集,而Al和W原子更多分配到有序γ"(L12)-析出相。在γ/γ"相界面γ相一侧出现Ni原子局部富集,导致界面自由能降低。γ"相中,溶质元素原子浓度总和约25 at.%,实验局部Al-R(R=Re、Ru或W)RDF在第1最近邻距离处负相关,说明Re、Ru和W优先占据Ni3Al(L12)结构的Al位。和三元合金Ni-Al-Cr相比,添加W、Re和Ru后,合金的γ相得到固溶强化,γ"相体积分数提高,硬度增加。
Study on Phase Separation of a Ni-based Superalloy after Long-time Aging
英文关键词:Ni-based superalloy  atom probe tomography  elements distribution  strengthening
英文摘要:
      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.
作者单位E-mail
黄彦彦 四川大学空天科学与工程学院 yyashleyhuang@foxmail.com 
周青华 四川大学空天科学与工程学院 qh.zhou@foxmail.com 
刘青 重庆大学材料科学与工程学院 815713821@qq.com 
蔡聪德 重庆大学材料科学与工程学院 354600674@qq.com 
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