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以Mg-6Al合金为研究对象,采用小型挤压模具及电子万能试验机对其进行热挤压,研究了挤压工艺参数对Mg-6Al合金显微组织和挤压力的影响。结果表明,均匀化态Mg-6Al合金经不同条件热挤压后发生了不完全动态再结晶,部分原始组织保留下来,且再结晶晶粒多数在原始晶界和孪晶处形核。随着挤压温度升高,挤压过程中的挤压力峰值及稳态挤压力均降低。随着挤压速度增大,挤压力峰值与稳态挤压力之间的差值增大。此外,增大挤压比,挤压力峰值及稳态挤压力随之增大。
With Mg-6Al alloy as the research object, a small extrusion die and an electronic universal testing machine were used to hot-extrude the Mg-6Al alloy. The effect of extrusion process parameters on microstructure and compressive stress of Mg-6Al alloy was studied. The results show that incomplete dynamic recrystallization occurs in the homogenized Mg-6Al alloy after hot extrusion under different conditions, and some of the original structure remains. The recrystallized grains mostly nucleate at the original grain boundaries and twin. As the extrusion temperature increases, the peak extrusion pressure and the steady-state extrusion pressure decrease. As the extrusion speed increases, the difference between the peak extrusion pressure and the steady-state extrusion pressure increases. In addition, increasing the extrusion ratio, the peak extrusion pressure and steady-state extrusion pressure increases.