Microstructure and microhardness of directionally solidified NiAl-W eutectic alloy

作     者：Jian-Jun Gao Zhi-Long Zhao Lu-Feng Wei Kai Cui Lin Liu Jian-Jun Gao;Zhi-Long Zhao;Lu-Feng Wei;Kai Cui;Lin Liu

作者机构：School of Mechanical Engineering and AutomationFuzhou UniversityFuzhou 350108China School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi'an 710072China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2020年第39卷第10期

页      面：1174-1180页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(No.51374173) 

主　　题：Microstructure Directional solidification Eutectic alloy Microhardness 

摘      要：The microstructure and microhardness of directionally solidified NiAl-W eutectic alloys at growth rates of 2-25μm·s^-1 were investigated by a Bridgman crystal growing facility at a temperature gradient of 300 K·cm^-*** view of the competitive growth between W dendritic and eutectic phases,W dendritic phase was eliminated,whereas the fully eutectic phase was prominent in the steady progress of the directionally solidified NiAl-W eutectic *** the growth rate(V)increased,both the structure and solid/liquid interface of the directionally solidified NiAl-W eutectic alloys changed from planar to *** the fibrous spacing(d)and the diameter(a)decreased with increase in growth rate(V).The Vickers microhardness(H)of the directionally solidified NiAl-W eutectic alloys decreased with fibrous spacing(d)or diameter(a)*** relationships of H to d and a were H=371.58 d^(-0.09)and H=297.70 a^(-0.09),respectively.