Effect of spark plasma sintering temperature on microstructure and mechanical properties of melt-spun TiAl alloys

被引：6

作者：

Chai Li-hua ^{[1
]}

Chen Yu-yong ^{[2
]}

Zhang Lai-qi ^{[1
]}

Lin Jun-pin ^{[1
]}

机构：

[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 03期

基金：

中国国家自然科学基金;

关键词：

TiAl alloy; rapid solidification; spark plasma sintering; microstructure; mechanical properties; GAMMA-TITANIUM ALUMINIDES; DEFORMATION;

D O I：

10.1016/S1003-6326(11)61209-0

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A TiAl alloy from pulverized rapidly solidified ribbons with the composition of Ti-46Al-2Cr-4Nb-0.3Y (mole fraction, %) was processed by spark plasma sintering (SPS). The effects of sintering temperature on the microstructure and mechanical properties were studied. The results show that the microstructure and phase constitution vary with sintering temperature. Sintering the milled powders at 1200 degrees C produces fully dense compact. Higher sintering temperature does not improve the densification evidently. The dominant phases are gamma and alpha(2) in the bulk alloys sintered at 1200 degrees C. With higher sintering temperature, the fraction of alpha(2) phase decreases and the microstructure changes from equiaxed near gamma grain to near lamellar structure, together with a slight coarsening. The bulk alloy sintered at 1260 C with refined and homogeneous near lamellar structure reveals the best overall mechanical properties. The compressional fracture stress and compression ratio are 2984 MPa and 41.5%, respectively, at room temperature. The tensile fracture stress and ductility are 527.5 MPa and 5.9%, respectively, at 800 degrees C.

引用

页码：528 / 533

页数：6

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