论文标题
氢在铝合金中延迟吉尼利蛋白区的形成
Hydrogen delaying the formation of Guinier-Preston zones in aluminium alloys
论文作者
论文摘要
实验研究了氢对Al-5cu合金中自然衰老过程中GP区域的形成和生长的后果进行实验研究至原子量表，并使用从头开始计算进行数值。正如通过扫描/透射电子显微镜所观察到的，由于氢化氢的自然衰老期间的GP区域的生长较慢，硬化动力学被延迟。根据从头算的计算，延迟的硬化是由于空缺中捕获的氢而导致的，从而显着减少了铜的扩散系数和铝的自扩散。扩散系数的降低是由于氢在与空位交换（并增加了能屏障）的原子路径中，或者是由于氢与空位（并导致较不稳定的状态）分离。
The consequences of hydrogen on the formation and growth of GP zones during natural ageing in an Al-5Cu alloy is investigated experimentally down to the atomic scale and numerically using ab initio calculations. As observed through scanning/transmission electron microscopy, the hardening kinetic is delayed due to a slower growth of GP zones during natural ageing when hydrogen is incorporated. According to ab initio calculations, the delayed hardening results from hydrogen trapped in vacancies that reduce significantly the diffusion coefficient of copper and the self diffusion of aluminium. This reduction of the diffusion coefficient is either due to hydrogen being in the path of the atom that exchange with the vacancy (and increasing the energy barrier) or due to hydrogen being dissociated from the vacancy (and leading to a less stable state).
