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

页码：80 / 84

页数：5

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