研究了镍基单晶高温合金DD3(001),(011),(111)取向光滑圆拉伸试样在760℃,850℃,950℃典型应力条件下的拉伸蠕变特征.试验发现,在较高蠕变应力水平时,DD3单晶合金具有明显且复杂的拉伸蠕变各向异性,且蠕变变形率及其对应力增加的敏感性的强弱顺序会随温度变化而发生变化.这归因于该合金的成分特征、蠕变应力、晶体取向决定的蠕变主滑移系类型(八面体、立方及二者混合)及位错移动动力学特点的不同.
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