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Corrosion is one of the most drawbacks which restricts the wide applications of Mg alloys. In the last decade, the corrosion behaviors of Mg alloys with stacking fault (SF) and/or long period stacking ordered (LPSO) structures have obtained increasing attention. However, the corrosion mechanism of the SF– or LPSO–containing Mg alloys has not been well illustrated and even reverse results have been reported. In this paper, we have reviewed recent reports on corrosion behaviors of SF– or LPSO–containing Mg alloys to better clarify and understand the significance and mechanism. Moreover, some deficiencies are presented and advises are proposed for the development of corrosion resistant Mg alloys with SF or LPSO structures. [ABSTRACT FROM AUTHOR]

The effect of hydrogen content on the deformation and fracture behavior of 27Cr-4Mo-2Ni super ferritic stainless steel (SFSS) was investigated in this study. It was shown that the plasticity and yield strength of SFSS were very susceptible to hydrogen content. The introduction of hydrogen led to a significant decrease in elongation and a concurrent increase in yield strength. Nevertheless, a critical threshold was identified in the elongation reduction, after which the elongation remained approximately constant even with more hydrogen introduced, while the yield strength exhibited a monotonic increase with increasing hydrogen content within the experimental range, attributed to the pinning effect of the hydrogen Cottrell atmosphere on dislocations. Furthermore, the hydrogen-charged SFSS shows an apparent drop in flow stress after upper yielding and a reduced work hardening rate during the subsequent plastic deformation. The more hydrogen is charged, the more the flow stress drops, and the lower the work hardening rate becomes.