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本文研究了工业纯铝在不同断裂类型的蠕变过程中晶界内耗峰的变化。由晶界内耗曲线所包围的面积求出晶界弛豫度,而晶界弛豫度的下降意味着晶界强度增高。根据实验结果可以推知:在沿晶型断裂过程中,晶界不发生强化;在混合型断裂过程中,晶界发生了强化;在穿晶型断裂过程中,晶界则发生了显著的强化。这说明:发生不同类型的蠕变断裂,不仅决定于晶界和晶粒在蠕变试验前的相对强度,而且与蠕变过程中晶界强化的程度有关。
In this paper, the changes of peak wear in the grain boundary during the creep process of industrial pure aluminum in different fracture types were studied. The grain boundary relaxation is calculated from the area surrounded by the internal friction curve, and the decrease of the grain boundary relaxation means that the grain boundary strength is increased. According to the experimental results, it can be inferred that the grain boundary does not strengthen during the intergranular fracture, the grain boundary strengthens during the intergranular fracture, and the grain boundary strengthens remarkably during the transgranular fracture. This shows that different types of creep rupture occur not only because of the relative strength of the grain boundaries and grains before the creep test but also because of the degree of grain boundary strengthening during the creep process.