Abstract
The effect of equal-channel angular pressing (ECAP) on stress corrosion cracking (SCC) behavior of a cast AZ61 Mg alloy was investigated in distilled water (DW) using the slow strain rate tensile test (SSRT) at a strain rate of 1 × 10−6 s−1. The fine-grained alloy after ECAP showed a greater SCC susceptibility but a higher ultimate tensile strength, compared with the as-cast counterpart. The results were attributed to refined grains, high-density dislocations and increased proportion of high-angle grain boundaries induced by severe plastic deformation, as well as isolated fine β-phase particles transiting from net-like β-phase.
Highlights
Magnesium alloys are very attractive light materials, due to a high strength to weight ratio, being pollution-free, non-toxic, and exhibiting easy recovery [1,2], etc
Grains were refined to the average size of ~10 μm after 8 equal-channel angular pressing (ECAP) passes at 673 K, whereas the determined by linear intercept method
stress corrosion cracking (SCC) behaviors of as-cast and ECAPed AZ61 Mg alloys were investigated by slow strain rate tensile test (SSRT) tests and the following conclusions could be made: 1
Summary
Magnesium alloys are very attractive light materials, due to a high strength to weight ratio, being pollution-free, non-toxic, and exhibiting easy recovery [1,2], etc. The pressing matter of the moment is to understand the SCC behavior of magnesium alloys so as to improve their SCC resistance, making greater application of structural components of magnesium alloys possible. Constant efforts have been made to figure out the influencing factors of SCC behavior of magnesium alloys, including alloy composition, the manufacturing process, microstructure and heat treatment [1], etc. It has been demonstrated [5] that hydrogen is crucial to the mechanism of the SCC of magnesium alloys. Srinivasan et al [4] reported that the wrought
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