Crack damage is easily generated in magnesium alloys due to their hexagonal close-packed crystal structure. Electropulsing treatment is a promising technique for metal crack arrest and has attracted widespread attention. In this study, electropulsing treatment was applied to AZ31B magnesium alloy and its effects on the crack arrest and tensile fracture behavior were analyzed. The results showed that tensile strength can be improved in the appropriate parameters and it was found that the effect was related to the size of the melting hole at the crack tip. Based on elastic-plastic fracture mechanics, the tensile fracture behavior in different crack sizes was discussed and the relationship between the geometric shape factor and the crack characteristics influenced by the melting hole was analysed. Moreover, the finite element analysis in the crack arrest process and the evolution of microstructure were investigated. It is concluded that crack-closure effects and stress-concentration relief are the primary contributors to effective crack arrest. It is important to control the melting hole size by the pulse current parameters. This study can be useful to reveal the effect of the pulse current on the crack arrest of AZ31B magnesium alloy.
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Zhang et al. (2026) studied this question.
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