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Microstructure study of a gamma-TiAl based alloy containing W and Si
W. M. Yin; V. Lupinc; L. Battezzati
1997
发表期刊Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN0921-5093
卷号240页码:713-721
摘要The phase transformations and modulated microstructures in the cast alloy Ti-47Al-2W-0.5Si(at.%) have been studied. It has been shown that microstructure is sensitive to heat treatment and composition. The structure in the alloy heat treated at 1300 degrees C mainly consists of coarse lamellar, fine lamellar, equiaxed gamma grains and beta phase. Homogenizing treatment at 1400 degrees C results in nearly fully-lamellar structure which shows colony-boundary gamma phase grains. The observations showed that small increases in W content result in changes in the amount and morphology of beta phase. For the alloy containing 2.1 at.% W, the beta phase has been observed in three types of morphology: blocky beta phase containing gamma needles and fine silicide particles inside; rod-like beta phase and fine needle-like beta phase. For the alloy variant containing 1.5 at.% W, only a very small amount of rod-like beta phase appeared. Different mechanisms are proposed to explain the occurrence of three types of beta phase, in that W may stabilize it by extending the primary beta phase to lower temperature as well as by yielding new phase zones. A few primary silicide particles have been found in the interdendrite region in the alloys containing more than 0.5 at.% Si, while coherent secondary silicides generally nucleated at the interfaces. (C) 1997 Elsevier Science S.A.
部门归属cnr, tempe, i-20125 milan, italy. acad sinica, inst met res, shenyang 110015, peoples r china. univ turin, dipartimento chim ifm, i-10125 turin, italy.;yin, wm (reprint author), cnr, tempe, via r cozzi 53, i-20125 milan, italy
关键词Gamma-tial Microstructure Phase Transformation Tungsten Beta Phase Titanium Aluminides Phase-stability Al
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WOS记录号WOS:000071868000100
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被引频次:52[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/38177
专题中国科学院金属研究所
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W. M. Yin,V. Lupinc,L. Battezzati. Microstructure study of a gamma-TiAl based alloy containing W and Si[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1997,240:713-721.
APA W. M. Yin,V. Lupinc,&L. Battezzati.(1997).Microstructure study of a gamma-TiAl based alloy containing W and Si.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,240,713-721.
MLA W. M. Yin,et al."Microstructure study of a gamma-TiAl based alloy containing W and Si".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 240(1997):713-721.
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