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金属学报  2011 

和取向DD407单晶高温合金枝晶间距和微观偏析

DOI: 10.3724/SP.J.1037.2011.00142, PP. 1246-1250

Keywords: 晶体取向,镍基单晶高温合金,枝晶间距,微观偏析,定向凝固

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Abstract:

采用液态金属冷却(LMC)高温度梯度定向凝固炉制备和取向的DD407单晶高温合金,研究了晶体取向对枝晶间距和微观偏析的影响.结果表明,晶体取向对单晶高温合金的枝晶间距和微观偏析有明显的影响.枝晶间距随着取向偏差角的增加而增加,但随取向偏差角的增加而减小,且取向的枝晶间距因为侧枝的分枝而明显大于取向.成分分析表明,在不同取向的单晶中,Al,Ti和Ta富集于枝晶间,是正偏析元素,而W严重富集于枝晶干,为负偏析元素,当取向平行轴向时元素的偏析程度最轻.

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