Microstructure and microhardness of directionally solidified NiAl-W eutectic alloy

被引：5
|
作者：
Gao, Jian-Jun [1 ,2 ]
Zhao, Zhi-Long [2 ]
Wei, Lu-Feng [2 ]
Cui, Kai [2 ]
Liu, Lin [3 ]
机构：
[1] Fuzhou Univ, Sch Mech Engn & Automat, Fuzhou 350108, Peoples R China
[2] Northwestern Polytech Univ, Sch Mech Engn, Xian 710072, Peoples R China
[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
RARE METALS | 2020年 / 39卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Microstructure; Directional solidification; Eutectic alloy; Microhardness; MECHANICAL-PROPERTIES; TUNGSTEN NANOWIRES; PARAMETERS; EVOLUTION; LAMELLAR; MO;
D O I：
10.1007/s12598-019-01268-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and microhardness of directionally solidified NiAl-W eutectic alloys at growth rates of 2-25 mu m center dot s(-1)were investigated by a Bridgman crystal growing facility at a temperature gradient of 300 K center dot cm(-1). In 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 alloys. As the growth rate (V) increased, both the structure and solid/liquid interface of the directionally solidified NiAl-W eutectic alloys changed from planar to cellular. Both 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) increasing. The relationships ofHtodandawereH = 371.58d(-0.09)andH = 297.70a(-0.09), respectively.
引用
收藏
页码：1174 / 1180
页数：7
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