研究了具有粗、细两种不同晶粒组织状态的MGH956合金板材室温～1200℃拉伸及1100℃持久性能.采用扫描电镜和金相显微镜对拉伸和持久试样的断口形貌及纵剖面组织进行了检验,对比分析了两种板材不同温度下的强化因素、及变形和断裂模式.结果表明:正是由于强化因素、及变形和断裂模式上的不同,使得细晶板材的拉伸强度在低温高于粗晶板材,在高温则低于粗晶板材,以及细晶板材的持久强度大大低于粗晶板材；但两种板材从室温～ 1200℃的拉伸伸长率并无明显差异.
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