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。
Grain boundary segregation, hydrogen embrittlement susceptibility and Mg-H interaction of 7075 aluminum alloys with double-peak aged were studied by means of cathodic H-permeation, hydrogen determinator, electronic tensile machine， energy dispersive X-ray spectrometer (EDS) and scanning electron microscopy (SEM). The results showed that both before and after hydrogen charging, the strength and etc. all had double peaks; the decline of second peak strength was smaller than the first peak, also it had excellent performance like high-strength and low- HE-susceptibility at the second peak; there may exist Mg-H interaction during the hydrogen charging process. Finally, the Mg-H interaction mechanism is discussed.
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