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A two-stage pretreatment (TSP), namely ultrasonic vibration treatment and solid-solution treatment, is proposed to improve the microstructure and properties of Mg-9Al-1Si alloy before equal-channel angular pressing (ECAP). The ultrasonic vibration treatment could distribute Mg2Si and Mg17Al12 phases uniformly in the alloy, while alloys subjected to solid-solution treatment exhibited a reduction in...
Prestretch deformation of 6.48% with various initial speeds (1 mm/min, 101 mm/min, and 100 mm/min) was carried out at 723 K to improve the formability of AZ31 Mg alloy sheet. After prestretching, the (0001) basal texture weakened with increase in the speed owing to activation of nonbasal slips during deformation, while the yield strength and anisotropy decreased simultaneously. Owing to the basal...
In order to improve the stretch formability of magnesium alloy sheets, {10–12} tension twins were introduced by pre-compression along the rolling (RD) and transverse directions (TD) with 1.6%, 3.3%, and 5.4% strain levels. Subsequent annealing at 473 K was conducted for 6 h to preserve twinning lamellae. In order to avoid bending–buckling, a special fixture for thin sheet compression has been developed...
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