一个新的金属高温蠕变空洞形核理论模型

A Cavity Nucleation Model During High Temperature Creep Deformation of Metals

本文在以往的蠕变变形空洞形核模型的基础文上提出了一个新的空洞形核模型。该模型不但考虑了位错塞和所产生的应力集中的作用,同时也考虑了空位聚集的作用。从本文推导出的临界空洞半径表达式即可得出Raj等人提出的临界半径关系式,又可得出Smith等人提出的空洞形核临界应力关系式,从而说明本文提出的空洞形核模型比以往的模型具有更广泛的适用范围。

Based on previous theoretical models of cavity nucleation during creepdeformation, a new cavity nucleation model is proposed. The basic idea of this new model is that cavity nucleation during creep deformation depends not only on the stress concentration of piled-up group of dislocations, but also vacancy clustering. From the critical radius of cavity nucleation inferred in this paper, not only Raj's critical radius formula but also Smith's critical stress for cavity nucleation can be obtained. The new cavity nucleation model proposed has a wider application than those proposed before.