Effect of Mn Addition on Microstructural Changes and Mechanical Properties of Ti-5Al-2.5Fe Alloys

被引：4

作者：

Bak, Gyeong Ryeong ^{[1
,2
]}

Jeong, Dae-Won ^{[1
,2
]}

Hyun, Yong Taek ^{[2
]}

Park, Hyun Soon ^{[3
]}

机构：

[1] Dong A Univ, Dept Mat Sci & Engn, Busan 49315, South Korea

[2] Korea Inst Mat Sci, Titanium Dept, Chang Won 51508, South Korea

[3] Inha Univ, Dept Mat Sci & Engn, Incheon 22212, South Korea

来源：

METALS AND MATERIALS INTERNATIONAL | 2019年 / 25卷 / 06期

基金：

新加坡国家研究基金会;

关键词：

Titanium alloys; Mn addition; Transmission electron microscopy; Strain; stress measurements; Phase fraction; Oxygen; DEFORMATION-BEHAVIOR; TITANIUM-ALLOYS; OXYGEN; TI;

D O I：

10.1007/s12540-018-0115-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructures and mechanical properties were investigated in newly developed Ti-5Al-2.5Fe and Ti-5Al-2.5Fe-2Mn alloys, which were fabricated by two-step hot rolling processes. Lamellar structures were observed in the Ti-5Al-2.5Fe-2Mn alloy aged at 600 degrees C for 24 h, depending on the viewing directions (normal, rolling, and transverse). In the aged Ti-5Al-2.5Fe alloy, a spheroidized alpha matrix and TiFe precipitates in the alpha grain boundary were observed, with a crystallographic orientation relationship of (011)(TiFe)//(011 over bar 0)(alpha). It was found that Mn addition improved the mechanical properties, attributed to the increased beta phase (approximately 4.3 times relative to the Ti-5Al-2.5Fe alloy) and solid solution strengthening. Interestingly, in the Ti-5Al-2.5Fe alloys, the oxygen was enriched by the TiFe phase rather than the alpha phase, which may weaken the oxygen solute dragging effect.

引用

页码：1521 / 1528

页数：8

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