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利用超景深显微镜、扫描电镜(SEM)、电子背散射衍射(EBSD)研究了高能量脉冲电流对10%、15%、20%不同轧制变形量AZ31镁合金组织演化与力学性能的影响。当变形量为20%的轧制板材经电流密度为4.16×10~9 A/m~2、脉宽为30μs、频率为100 Hz的脉冲电流处理10 min后,平均晶粒尺寸由150μm细化至20μm,抗拉强度提升至265 MPa,伸长率可达19.7%。同时,分析了此实验参数下电脉冲处理过程中热效应与非热效应对再结晶的影响,发现热效应在再结晶过程中占主导作用,并揭示了非热效应的作用机理。
The effects of high-energy pulsed current on the microstructure evolution and mechanical properties of AZ31 magnesium alloy with 10%, 15%, 20% different rolling deformation were investigated by means of scanning electron microscope (SEM) and electron backscatter diffraction (EBSD). When the deformation of 20% of the rolled plate by the current density of 4.16 × 10 ~ 9 A / m ~ 2, the pulse width of 30μs, the frequency of 100Hz pulse current treatment 10 min, the average grain size refined from 150μm To 20μm, tensile strength increased to 265 MPa, elongation up to 19.7%. At the same time, the influence of thermal effect and non-thermal effect on recrystallization in the process of electric pulse processing is analyzed. It is found that the thermal effect plays a leading role in the recrystallization process and reveals the mechanism of non-thermal effect.