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金属学报  2002 

定向凝固NiAl-28Cr-5.8Mo-0.2Hf合金的高温拉伸蠕变行为

, PP. 342-346

Keywords: NiAl合金,拉伸蠕变,蠕变机制

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Abstract:

研究了定向凝固NiAl-28Cr-5.8Mo0.2Hf合金的显微组织和在982-1100℃,50-124MPa应力下的高温蠕变行为.该合金是由NiAl相,Cr(Mo)相和少量Hf的固溶体相组成.蠕变测试结果表明蠕变曲线是由较短的减速蠕变阶段和较长的加速蠕变阶段组成,且蠕变后的显微组织变化不大,蠕变变形机制是由位错攀移机制所控制.加速蠕变阶段蠕变速率的增加是由于裂纹的形成与扩展引起的.

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