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CHARAC TERIZATION OF TiAl POWDER PRODUCED BY MECHANICAL ALLOYING
被引：0
作者：
XiongXiang HuangBaiyun LeiChangmin LuHaibo Central South University of TechnologyChangsha China
[410083
]
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关键词：
TiAl alloy powder;
mechanical alloying;
SEM;
optical microscopy;
DSC;
dilatometry;
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摘要：
<正> The microstructure,alloying reaction and sintering behavior of the powder produced by Mechanical Al-loying(MA)for 8 h from 64 wt.-% Ti powder and 36 wt.-% Al powder were studied by scanning electronmicroscopy,optical microscopy,X-ray diffractometry,differential scanning calorimetry(DSC)and dilatometry.The mechanically alloyed powder partictes are Ti-Al composite particles.Thus,titanium aluminides can formeasily in the powder through diffusion during heat treatment.It is shown that the sintering behavior of this pow-der,different from the behaviors of TiAl alloy powder and mixed powder of 64 wt.-% Ti powder and 36 wt.-%Al powder,changes from expansion at temperatures below 1000℃ to shrinkage at temperatures above 1000℃.Homogeneously alloyed TiAl material with a density over 96% of the theoretical density can be produced fromthe mechanically alloyed powder by compaction-sintering.
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页码：65 / 69
页数：5
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