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发现微量Mg、Cr 和Co 元素对MonelK500型的高温塑性具有明显的改善作用, 实验合金在高温下表现出一定的超塑性。测定了超塑性的应变速率敏感指数m 值和形变激活能, 发现合金在超塑性变形时激活能较低。超塑性变形可能是一个扩散所控制的过程。通过微量杂质在晶界偏聚的断裂功计算表明, Mg、Cr 和Co 具有改善NiCu 基合金晶界结合力的作用, 与试验结果符合。
It was found that the trace elements Mg, Cr and Co have a significant improvement on the high temperature plasticity of Monel K-500, and the experimental alloy shows some superplasticity at high temperature. The strain rate sensitivity index (M) and deformation activation energy of the superplasticity were measured. It was found that the activation energy of the alloy during superplastic deformation was lower. Superplastic deformation may be a diffusion-controlled process. The fracture work calculated by the segregation of trace impurities at the grain boundaries shows that Mg, Cr and Co have the effect of improving the grain boundary bond strength of NiCu based alloys, which accords with the experimental results.