Ni-Al二元镍基模型高温合金热暴露实验过程中γ’相尺寸与体积分数的变化

Ni-Al二元镍基模型高温合金热暴露实验过程中γ’相尺寸与体积分数的变化

刘程鹏¹，张晓娜^{1 *}，葛 麟¹，李 宪¹，王崇愚^{2, 3}，于 涛³，张 泽⁴

（1. 北京工业大学固体微结构与性能研究所，北京100124；2. 清华大学物理系，北京100084；3. 钢铁研究总院，北京100081；4. 硅材料国家重点实验室，浙江大学电子显微镜中心，浙江大学材料科学与工程学院，浙江杭州310027）

摘 要: 本文利用扫描电子显微镜（SEM），研究了Ni-Al二元模型镍基单晶高温合金在热暴露实验过程中γ’相尺寸与体积分数的变化。结果表明：随着热暴露时间的增加，一次γ’相尺寸明显增大，其长大机制为扩散控制的粗化机制(L-S-W理论)。其平均尺寸的立方与热暴露时间呈线性关系。通过对γ’相体积分数的统计显示，γ’相体积随热暴露时间的延长而减小，这是高温下γ相固溶度增加以及γ’溶解的结果，可以用Ni-Al二元相图来解释此现象。

关键词：镍基单晶高温合金；SEM；γ’相尺寸；γ’相体积分数

中图分类号：TG146.1⁺5；TG132.3⁺2；TG115.21⁺5.3     文献标识码：A     doi:10.3969/j.1000-6281.2015-04.004

The change ofγ’ phase sizes and volume fractionin a Ni-Al binary modelnickel-based single-crystal alloy during the thermal exposure treatment

LIU Chengpeng¹, ZHANG Xiaona^{1 *}, GE Lin¹, LI Xian¹, WANG Chongyu^{2, 3}, YU Tao³, ZHANG Ze⁴

(1. Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124；2. Department of Physics, Tsinghua University, Beijing 100084；3. Central Iron & Steel Research Institute, Beijing 100081；4. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou Zhejiang 310027, China)

Abstract: The change ofγ’ phase size and volume fraction in a Ni-Al binary model nickel-based single-crystal alloy during the thermal exposure treatment were investigated by the scanning electron microscopy. The results show that the primary γ’ precipitates grow up in size with the increase of thermal exposure time. The growth of γ’ precipitate is controlled by diffusion mechanism (L-S-W mechanism). The size ofγ′ particles is proportional to the thermal exposure time t^1/3. The volume fraction ofγ’ phase decreases with the increase of the thermal exposure time, which is due toγ’phase dissolution at high temperature. It can be explained by the Ni-Al phase diagram.

Keywords: nickel-based single-crystal alloy; SEM; sizes ofγ’ phase; volume fraction of γ’ phase

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