论文部分内容阅读
本文研究了与工业用的成分相近的铝-锌-镁合金当加入铜、铬和锰时,对淬火敏感性的影响,以及在缓冷淬火时机械性能的损失。缓冷淬火时硬度的变化是用乔米尼(Jominy)试验方法~*进行的,伴随的显微组织变化是用光学与电子显微镜检查的。在简单的三元合金中,很少或没有观察到淬火敏感性,但是当含有铜、铬和锰时,在含2.5％镁的合金中(不是含1％镁的那一种)发现了淬火敏感性。铬的作用最明显,其次是锰和铜。显微组织表明,淬火敏感性的作用归因于缓冷时溶质原子以非共格形式析出,这样析出对于随后的时效硬化没有帮助。为了解释淬火敏感性对成分的依赖性,作者提出了模型进行讨论。
In this paper, the effects of the addition of copper, chromium and manganese on the susceptibility to quenching and the loss of mechanical properties during slow cooling quenching have been studied for aluminum-zinc-magnesium alloys with similar compositions to those used in industry. The hardness change during slow cooling quenching was performed using the Jominy test method *, with the accompanying microscopic changes checked by optical and electron microscopy. In simple ternary alloys, little or no quench sensitivity was observed, but quenching was found in alloys containing 2.5% magnesium (not one containing 1% magnesium) when containing copper, chromium and manganese Sensitivity. The most obvious role of chromium, followed by manganese and copper. The microstructure indicates that the effect of quench sensitivity is due to the dissociation of the solute atoms in a non-coherent manner during slow cooling, so precipitation does not contribute to the subsequent age-hardening. To explain the dependence of quenching sensitivity on composition, the authors propose a model for discussion.