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利用阴极渗氢法、定氢仪、电子拉伸实验机、能谱(EDS)和扫描电镜(SEM)等方法研究了“双峰”时效下7075铝合金的晶界偏析行为、氢脆(HE)敏感性以及Mg-H相互作用。结果表明:充氢前后合金的强度等性能具有时效“双峰”特征;第二峰处合金强度的下降量明显比第一峰的小,且第二峰时合金具有高强、低HE敏感性等优异性能;在阴极渗氢过程中Mg与H之间存在着相互作用。最后,对Mg-H相互作用机制进行了探讨。
The grain boundary segregation behavior of 7075 aluminum alloy under “bimodal” aging was studied by means of cathodic hydrogenation, hydrogen deposition, electronic tensile testing machine, energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM) (HE) sensitivity and Mg-H interaction. The results show that the strength and other properties of the alloy before and after hydrogen charging have the characteristic of “double peak” aging; the decrease of the alloy strength at the second peak is obviously smaller than that of the first peak, and the alloy has high strength and low HE sensitivity And other excellent performance; there is an interaction between Mg and H in the process of cathodic hydrogen permeation. Finally, the mechanism of Mg-H interaction is discussed.