Effect of Heat Treatments on Microstructure and Tensile Properties of TiAl Alloy Extruded below Tα

被引：0

作者：

Liu Liangliang ^{[1
,2
]}

Liu Dong ^{[1
]}

Liu Renci ^{[1
]}

Cui Yuyou ^{[1
]}

Yang Rui ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] Univ Sci & Techn China, Sch Mat Sci & Engn, Shenyang 11006, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2017年 / 46卷

关键词：

TiAl alloy; hot extrusion; heat treatment; microstructures; tensile property;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Ti-47Al-2Cr-2Nb-0.15B (at%) alloy rod was fabricated by near isothermal canned hot extrusion at 1300 degrees C on a 3:1 extrusion ratio. With less refined microstructure including small equiaxed grain belt, remnant lamellar and coarse gamma grains in the band shape, the extrusion rod was heat-treated at 900, 1150 and 1310 degrees C separately. The tensile results at room and elevated temperature shows that samples by heat-treatment at 900 degrees C have the best balanced tensile properties with 3.3% elongation at RT. For those samples heat treated at 1150 degrees C with microstructure of near gamma and heat treated at 1310 degrees C with microstructure of near lamellar, their yield strength and ultimate tensile strength are lower than those heat treated at 900 degrees C. The remnant lamellar restricts the gamma grains from growing freely and keeps the microstructure with extrusion morphology at 900 degrees C.

引用

页码：95 / 98

页数：4

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