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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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L10结构TiAl中超位错分解宽度研究
, PP. 583-588
Keywords: TiAl,超位错,分解宽度
Abstract:
研究了弹性各向异性、超位错分解组态,变形温度及层片界面对L10结构TiAl合金中超位错分解宽度的影响作用.计算结果表明,同弹性各向同性相比,弹性各向异性减小了超位错的分解宽度,并且,使螺型超位错和刃型超位错的分解宽度差别减小.超位错发生三重或四重分解时,形成内禀性层错(SISF)的分解宽度小于其发生二重分解时的分解宽度.非共面分解对超位错的分解宽度也有一定的影响,随分解位错的Burgers矢量不同而不同.实验结果表明,温度变化对＜101]型超位错的分解宽度几乎没有影响,显示了剪切模量和层错能随温度变化而具有相同的变化趋势.＜101]型超位错在γ/γ层片界面附近的分解宽度不同于γ层片内,位错分解位置愈靠近γ/γ层片界面,分解宽度愈窄.
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