A study of unstable fracture of a magnesium alloy caused by uneven microstructure

Tian, Jing; Deng, Jia-fei; Chang, Yuanyi; Shi, Qing; Liang, Wei; Ma, Jinyao

doi:10.1016/j.matlet.2022.131799

Cited by 14 publications

(2 citation statements)

References 5 publications

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“…Based on SEM images and EBSD data acquired during tensile testing, slip trace analysis was performed to identify activated slip systems. The following common slip systems in magnesium alloys are considered [ 18 , 29 , 30 , 31 , 32 ]:…”

Section: Methodsmentioning

confidence: 99%

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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In this paper, quasi-in situ experiments were carried out on rolled AZ31 magnesium alloy sheets to track the recrystallization behavior of the rolled microstructure during the heat treatment process and the plastic deformation behavior during the stretching process. The as-rolled microstructures are classified into five characteristics and their plastic deformation behaviors are described. The research shows that annealing recrystallization leads to grain reorganization, resulting in the diversity of grain orientation, and it is easier to activate basal slip. Recrystallization preferentially nucleates in the regions with high stress, while it is difficult for recrystallization to occur in regions with low stress, which leads to the uneven distribution of the as-rolled structure of magnesium alloys. Slip can be better transmitted between small grains, while deformation between large and small grains is difficult to transmit, which can easily lead to the generation of ledges. Incomplete recrystallization is more likely to accumulate dislocations than complete recrystallization, and ledges are formed in the early stage of deformation. Microcracks are more likely to occur between strain-incompatible grains. It is of great significance to promote the application of rolled AZ31 magnesium alloys for the development of heat treatment and subsequent plastic working of rolled magnesium alloys.

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Section: Methodsmentioning

confidence: 99%

Quasi-In-Situ Analysis of As-Rolled Microstructure of Magnesium Alloys during Annealing and Subsequent Plastic Deformation

et al. 2022

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“…Such variability in shape accommodation is connected to crystal orientations and crystallographic deformation mechanisms. In previous studies, cracking was thought to be related to {10-12} tension twinning [5], {10-11}-{10-12} double twinning [6,7], persistent slip bands [8] or grain boundaries [9]. J. Koike et al [7] thought {10-11}-{10-12} double twinning would lead to the formation of large surface steps, cracks and final failure.…”

Section: Introductionmentioning

confidence: 99%

Intergranular Cracking in Mg-Gd-Y Alloy during Tension Test

et al. 2022

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The intergranular cracking in the Mg-Gd-Y alloy was investigated by an in situ tension test combined with an electron backscattered diffraction (EBSD) measurement and digital image correlation (DIC). During the tension test, the crack was found at the triangle point of the grain boundary area with profuse slip traces. DIC results show that inhomogeneous strain distribution can be found at the triangle point area, leads to serious deformation incompatibility at this point. This also leads to a weak point for crack initiation, and as tension strain increases, the crack would extend from the weak point along the grain boundary.

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