Effect of spark plasma sintering temperature on microstructure and mechanical properties of an ultrafine grained TiAl intermetallic alloy

被引：55
作者：
Chen, Y. Y. [2 ]
Yu, H. B. [2 ]
Zhang, D. L. [1 ]
Chai, L. H. [2 ]
机构：
[1] Univ Waikato, WaiCAM, Dept Engn, Hamilton, New Zealand
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 525卷 / 1-2期
关键词：
Spark plasma sintering; Titanium aluminide; Ultrafine grained structure; Mechanical properties; High energy mechanical milling; SOLID-SOLUTIONS; STRENGTH;
D O I：
10.1016/j.msea.2009.06.056
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of spark plasma sintering (SPS) temperature on the microstructure and mechanical properties of a bulk solid ultrafine grained gamma TiAl alloy produced by SPS of an ultrafine structured Ti/Al composite powder with a nominal composition of Ti-47 at.%Al has been investigated. The Ti/Al composite powder was produced using high energy mechanical milling. it was found that an SPS temperature of 800 degrees C led to the completion of the reactions needed for reaching the phase equilibrium and formation of a nanostructure with grain sizes in the range of 50-100 nm. However, this SPS temperature was not sufficient to achieve a nearly full density of the compact or a high level of interparticle bonding. Increasing the SPS temperature from 800 to 900 degrees C caused a significant increase of the density and the level of interparticle bonding while still maintaining grain sizes of <500 nm. The bulk TiAl alloy produced under this condition had a good compression yield strength, fracture strength, bending strength and plastic strain to fracture of 1722, 1963, 610 MPa and 4%, respectively. increasing the SPS temperature from 900 to 1100 degrees C caused significant coarsening of the TiAl grains which led to a clear decrease in yield strength and hardness and a slight increase in ductility. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：166 / 173
页数：8
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