期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 525, 期 1-2, 页码 166-173出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.06.056
关键词
Spark plasma sintering; Titanium aluminide; Ultrafine grained structure; Mechanical properties; High energy mechanical milling
类别
资金
- Asia 2000 Foundation, New Zealand
- Foundation for Research, Science and Technology, New Zealand
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.
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