研究了一种含铼和碳的镍基单晶高温合金的铸态和热处理态的显微组织.结果表明:合金铸态组织中枝晶干和枝晶间区域的γ′相呈近立方状,枝晶间区域析出了少量的共晶相和MC型碳化物;合金经固溶处理后,共晶相完全消除,显微偏析得到明显改善.经标准热处理后,枝晶干和枝晶间的γ′相立方度提高,枝晶干区域γ′相的体积分数和尺寸都小于枝晶间区域的,其体积分数和尺寸分别为61%,0.32μm和68%,0.41μm,而碳化物的形貌和尺寸无明显变化.合金经1095℃/100h处理后,枝晶干析出了一定量富集Re和W的TCP相.
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