摘要
研究冷却速率对Al_(0.6)CoCrFeNi高熵合金粉体的影响。使用高压气雾化法制备Al_(0.6)CoCrFeNi球形高熵合金粉体,通过调整粉体粒径可以获得不同的冷却速率。基于凝固模型计算,获得冷却速率和粉体直径之间的关系。结果表明,随着粉体粒径的减小,粉体中FCC相的含量逐渐减小;进一步分析可以发现,随着冷速的增加,粉体由FCC+BCC双相结构逐渐转变为BCC单相结构;随着冷速从3.19×10~4K/s增至1.11×10~6K/s,粉体的显微组织表现出从平面晶到等轴晶的转变。
The influence of cooling rate on the microstructure of Al0.6CoCrFeNi high entropy alloy（HEA） powders was investigated. The spherical HEA powders（D50≈78.65 μm） were prepared by high pressure gas atomization. The different cooling rates were achieved by adjusting the powder diameter. Based on the solidification model, the relationship between the cooling rate and the powder diameter was developed. The FCC phase gradually disappears as particle size decreases. Further analysis reveals that the phase structure gradually changes from FCC＋BCC dual-phase to a single BCC phase with the increase of the cooling rate. The microstructure evolves from planar crystal to equiaxed grain with the cooling rate increasing from 3.19×10^4 to 1.11×10^6 K/s.
作者
周上程
张鹏
薛云飞
王富耻
王鲁
曹堂清
谈震
程宝元
王本鹏
Shang-cheng ZHOU;Peng ZHANG;Yun-fei XUE;Fu-chi WANG;Lu WANG;Tang-qing CAO;Zhen TAN;Bao-ynan CHENG;Ben-peng WANG(School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China;College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China)
基金
Project(51471035)supported by the National Natural Science Foundation of China
