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4.3 塑性松弛随着应变的增加,由于Orowan环而造成的局部应力(式8和10)将很快地达到一临界值,此后,或粒子发生变形,或周围基体发生塑性形变,从而产生松弛。在这一节中,我们将讨论应力松弛产生的机制。 4.3.1 粒子变形正如前面所讨论过的,软的或者非常小的粒子在合金发生屈服时,将发生变形,但是即使应变量很小时,也会由于Orowan环的形成使产生的应力超过它们的屈服或断裂强度而变
4.3. PLASTIC RELAXATION As the strain increases, the local stresses due to the Orowan ring (Eqs. 8 and 10) will soon reach a critical mass whereafter the particles or the particles deform or the surrounding matrix deforms plastically resulting in relaxation. In this section, we will discuss the mechanics of stress relaxation. 4.3.1 Particle Deformation As discussed earlier, soft or very small particles deform when the alloy yields, but even when the amount of strain is small, the stress generated by the Orowan rings exceeds their Yield or fracture strength and change