Publications by authors named "Xiu-Ming Cheng"
Article Synopsis
- The study examines how pulsed current affects the tensile deformation of AZ80 magnesium alloy, revealing reduced flow stress due to thermal and athermal effects.
- A quasi-in-situ electron backscatter diffraction analysis indicates that the geometrically necessary dislocation density is highest in room temperature samples, while pulsed current samples exhibit the least.
- The research also highlights that under pulsed current, the formation of tension twins is lower compared to other conditions, attributed to reduced dislocation accumulation at grain boundaries.
The high-temperature superplastic deformation behavior of rolled Mg-8Al-2Sn (AT82) and Mg-8Al-1Sn-1Zn (ATZ811) alloys were investigated in this study. During tensile deformation at 573 K, no obvious grain growth occurred in both alloys, because of the high-volume fraction of second phases located at grain boundaries. Meanwhile, texture weakening was observed, suggesting that grain boundary sliding (GBS) is the dominant superplastic deformation mechanism, which agreed well with the strain rate sensitivity () and the activation energy () calculations.
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