Microstructure and mechanical properties of Nb-doped NiAl-Cr(Mo) eutectic prepared by injection casting
来源期刊：中国有色金属学报(英文版)2005年第z3期
论文作者：淮凯文 郭建亭 高强 杨锐
文章页码：94 - 98
Key words：NiAl-Cr(Mo)-Nb alloy； injection casting； microstructure； mechanical properties
Abstract: The microstructure, compressive properties at different temperatures and hardness of NiAl-Cr（Mo）-Nb alloy prepared by injection casting were investigated. Compared with the conventionally-cast alloy, the injection-cast alloy exhibits a fine microstructure, i.e. the fine eutectic cell and interlamellar spacing as well as fine primary NiAl phase and NbCr2-type Laves phase due to the high cooling rate. In addition, the area fraction of eutectic cell increases due to the narrow intercellular zone. The Vickers hardness of injection-cast alloy is markedly enhanced. The ductility and strength at room temperature are increased by 88% and 30% compared with those of conventionally-cast alloy respectively. However, the high-temperature strength of injection-cast alloy is not improved markedly. The elevated temperature compression deformation behavior can be properly described by power-law equations.
