采用扫描电子显微镜(SEM)、电子探针(EPMA)和拉伸性能测试等手段,研究含Ru镍基单晶高温合金的显微组织、偏析行为和拉伸性能.结果表明:铸态下,Re,W强烈偏析于枝晶干而Ta,Al在枝晶间偏聚,Ru及其他元素分布趋于均匀.热处理后,Re,W偏析程度有所减轻;合金枝晶干和枝晶间处的γ’相均呈立方状,体积分数分别为63％和71％,平均尺寸分别为0.40 μm和0.54μm.拉伸性能结果表明,随着拉伸温度升高,合金抗拉强度和屈服强度先升高后降低,在760℃时达到最大值,但断后伸长率最小,为8.8％.合金在25℃,760℃和980℃下的断裂机制分别为类解理断裂、滑移分离剪切断裂和韧窝-类解理复合断裂.
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