Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing
Understanding the environmentally assisted cracking (EAC) initiation and propagation of new generation 7xxx alloys using slow strain rate testing
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DOI：
10.1016/j.corsci.2022.110161
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发表时间：
2022-02-16
影响因子：
8.3
通讯作者：
Burnett, T. L.
中科院分区：
文献类型：
--
作者：
Aboura, Y.;Garner, A. J.;Burnett, T. L.
新一代（新一代）7 xxx系列合金最近被证明在潮湿空气中对环境辅助开裂（EAC）的敏感性高于T7651回火的AA 7050。在低至20%的湿度水平下观察到脆性沿晶（IG）和穿晶（TG）断裂模式的氢（H）-EAC断裂特征。在金属间化合物颗粒簇与气孔的网站，启动是有利的。AA 7050的较高性能归因于该合金中的引发困难，其中晶粒结构与晶界对IG-EAC的固有抗性相结合，使得难以实现持续开裂。
New generation (new-gen) 7xxx series alloys have recently been shown to have higher susceptibility to environmental assisted cracking (EAC) in humid air, compared to AA7050, in T7651 tempers. Hydrogen (H)-EAC fracture features of brittle intergranular (IG) and transgranular (TG) fracture modes were observed with humidity levels as low as 20%. Initiation was favoured at sites of intermetallic particle clusters with gas pores. The higher performance of AA7050 was attributed to the difficulty of initiation in this alloy, where the grain structure, combined with an intrinsic resistance of the grain boundaries to IG-EAC, made the attainment of sustained cracking difficult.