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本文评述了晶界在金属蠕变和蠕变断裂中的作用,并对传统的“等强温度”概念进行了分析和讨论。文中报道了本文作者关于蠕变过程中晶界内耗和弹性模量变化的研究结果。文中指出,在蠕变过程中,晶界强度是变化着的,即它不仅是试验温度和形变速率的函数,而且是试验时间的函数。在不同的蠕变条件下,晶界强度变化的情况不同,最终导致了不同类型的蠕变断裂。这对于传统的“等强温度”概念,是一个修正和补充。
This paper reviews the role of grain boundaries in creep and creep rupture of metals, and analyzes and discusses the traditional concept of “isothermal temperature”. The paper reports the results of the author’s research on the changes of internal friction and elastic modulus in the creep process. It is pointed out in the paper that the strength of the grain boundary varies during creep, that is, it is not only a function of test temperature and strain rate, but also a function of test time. Under different creep conditions, the strength of the grain boundary changes in different situations, eventually leading to different types of creep rupture. This is a correction and supplement to the traditional concept of “isothermal temperature”.