Stability of lamellar microstructures in a Ti-48Al-2Nb-2Cr alloy during heat treatment and its application to lamellae alignment as a quasi-seed

被引：17
|
作者：
Du, Yujun [1 ]
Shen, Jun [1 ]
Xiong, Yilong [1 ]
Shang, Zhao [1 ]
Fu, Hengzhi [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
INTERMETALLICS | 2015年 / 61卷
基金：
中国国家自然科学基金;
关键词：
Aluminides; Thermal stability; Crystal growth; Heat treatment; Microstructure; TIAL-BASED ALLOYS; DIRECTIONAL SOLIDIFICATION; ELECTROMAGNETIC CONFINEMENT; PHASE-TRANSFORMATIONS; SI ALLOYS;
D O I：
10.1016/j.intermet.2015.02.018
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：
The stability of lamellar microstructures in the Ti-48Al-2Nb-2Cr alloy during heat treatment depends more on heating rate and less on holding time and cooling rate. When the heating rate is higher than 61 degrees C/min, the original lamellae orientation at room temperature can still maintain unchanged even though the lamellae are transformed to single grains alpha temperature close to melting point. Therefore, the high-temperature alpha grains, which are transformed from the alpha(2)/gamma lamellae within a quasi-seed, are successfully employed to align the lamellar microstructure by directional solidification. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：80 / 84
页数：5
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