Publications by authors named "Pin-Kui Ma"
Article Synopsis
- Electric pulses can enhance metals' plasticity by changing how dislocations move from localized planar slip to more uniform wavy slip.
- The study reveals that electric pulses also weaken the texture of a Mg-3Al-1Sn-1Zn alloy through a process called dynamic recrystallization at room temperature.
- Results show that higher current densities during tensile tests lead to lower flow stress but higher fracture strain, suggesting a complex relationship between electric current and material properties.
Article Synopsis
- - The study examined how equal channel angular pressing (ECAP) at 250 °C and 300 °C affected the microstructure and mechanical properties of a specific magnesium alloy (Mg-6Al-1Zn-0.9Sn).
- - It was revealed that the temperature significantly influenced grain refinement, primarily due to the precipitation of secondary-phase particles during processing.
- - The research also found that a particular 45° texture formed during ECAP plays a crucial role in enhancing yield strength through grain boundary strengthening, with variations depending on the processing temperature.
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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