Microstructural characterisation of Ni75Al25 and Ni31.5Al68.5 powder particles produced by gas atomisation

被引：9
作者：
Garcia-Escorial, A. [1 ]
Lieblich, M. [1 ]
机构：
[1] CENIM CSIC, Madrid 28040, Spain
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 586卷
关键词：
Intermetallics; Rapid solidification; Microstructure; Metallography; UNDERCOOLED MELTS; SOLIDIFICATION;
D O I：
10.1016/j.jallcom.2012.10.138
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work the microstructures of gas atomised Ni75Al25 and Ni31.5Al68.5 at.% powder particles below 100 mu m in size have been studied. The gas atomised Ni75Al25 powder particles are mainly spherical. The solidification of this alloy is very fast, and its microstructure consists of a dendrite and lamellar structure of partially ordered gamma-(Ni), gamma'-Ni3Al L1(2) phase, and beta-NiAl phase. The order increases with the powder particle size. The gas atomised Ni31.5Al68.5 powder particles are also spherical in shape. The microstructure consists of Ni2Al3 dendrites with interdendritic peritectic NiAl3 and eutectic NiAl3 + alpha-Al. The amount of the Ni2Al3 increases as the cooling rate increases. NiAl phase is absent in the gas atomised Ni31.5Al68.5 powder. (C) 2012 Elsevier B. V. All rights reserved.
引用
收藏
页码：S489 / S493
页数：5
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