研究了定向凝固NiAl-28Cr-5.8Mo 0.2Hf合金的显微组织和在982-1100℃,50-124 MPa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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