Effect of growth rate on microstructure and tensile properties of Ti-45Al-2Cr-2Nb prepared by electromagnetic cold crucible directional solidification

被引：37

作者：

Ding, Hongsheng ^{[1
]}

Wang, Yongzhe ^{[1
]}

Chen, Ruirun ^{[1
]}

Guo, Jingjie ^{[1
]}

Fu, Hengzhi ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China

来源：

MATERIALS & DESIGN | 2015年 / 86卷

基金：

美国国家科学基金会;

关键词：

TiAl base alloys; Directional solidification; Microstructure; Tensile properties; TRANSMISSION ELECTRON-MICROSCOPY; TITANIUM ALUMINIDE ALLOYS; TIAL ALLOYS; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; BETA-STABILIZERS; LAMELLAR; TRANSFORMATIONS; GAMMA; PHASE;

D O I：

10.1016/j.matdes.2015.07.122

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ti-45Al-2Cr-2Nb alloy was directionally solidified at different growth rates varying from 02 to 12 mm/min by applying an electromagnetic cold crucible directional solidification technique. It was determined that well-aligned alpha(2) (Ti3Al)/gamma(TiAl) lamellar structures, B-2 phase and blocky gamma phase were generated in columnar grains. The interlamellar spacing (lambda) decreases with the increasing growth rate (V) according to the relationship lambda infinity V-0.48, but the volume fraction of B-2 is increased as growth rate is increasing. Results of uniaxial tensile tests show that the B-2 phase and the blocky gamma phase have significant influence on tensile failure when they are presented in the matrix of alpha(2)/gamma lamellar structures, because they are usually employed to act as cracking sources during the tension process. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：670 / 678

页数：9

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