Simultaneous improvement of strength and ductility in NiAl-Cr(Mo)-Hf near eutectic alloy by small amount of Ti alloying addition

被引：16
|
作者：
Li Hu-Tian [1 ,2 ]
Gou Jian-ting [2 ]
Ye Heng-qiang [2 ]
Wang Qiang [1 ]
He Ji-Cheng [1 ]
机构：
[1] Northeastern Univ, Minist Educ, Key Lab Electromagnet Proc Mat, Shenyang 110004, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
MATERIALS LETTERS | 2008年 / 62卷 / 01期
基金：
中国国家自然科学基金;
关键词：
microstructure; (Ti; Hf) solid solution; mechanical properties; Heusler phase; intermetallic alloys and compounds; NiAl;
D O I：
10.1016/j.matlet.2007.04.069
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of Ti alloying addition on the microstructure and room temperature compression deformation behavior of a NiAl-Cr(Mo)-Hf near eutectic alloy were investigated by SEM, TEM, EDX and compression test. The results showed that compared with base alloy, the compressive fracture strain and 0.2% yield strength of the Ti-containing alloy were enhanced simultaneously. Disordered (Ti,Hf) solid solution phase together with the blocky Heusler phase Ni2Al(Ti,Hf) precipitation presented at eutectic cell boundaries is responsible for the enhancement in ductility due to the better deformation ability of (Ti,Hf) solid solution phase. The improvement in strength depends mainly on the solid solution strengthening in NiAl matrix by large amount of Ti due to its larger solid solubility relative to Hf in NiAl. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：61 / 64
页数：4
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