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研究了Mg-5.5Zn-2Gd-0.6Zr镁合金在不同挤压下的SSIMA法等温半固态组织演变过程和组织粗化行为。结果表明,在相同挤压比条件下,α-Mg平均晶粒直径与等温时间之间的关系为:等温处理后平均晶粒直径的三次方与初始平均晶粒直径的三次方的差值等于粗化速率常数与等温时间的乘积。粗化速率常数K随挤压比的增大而减小。当挤压比分别为10、15、30时,镁合金横向组织晶粒粗化速率常数K分别为359、289、266μm3/s。另外,挤压比越高,镁合金半固态组织等温转变各阶段的进程加快,α晶粒的圆整度和均匀程度越好。
The microstructure evolution and microstructure of the Mg-5.5Zn-2Gd-0.6Zr magnesium alloy under different extrusion pressures were investigated. The results show that under the same extrusion ratio, the relationship between the average grain diameter of α-Mg and the isothermal time is that the difference between the third power of the average grain diameter after the isothermal treatment and the third power of the initial average grain diameter is equal to The product of the coarsening rate constant and isothermal time. The coarsening rate constant K decreases with the extrusion ratio. When the extrusion ratio is 10, 15, 30 respectively, the grain coarsening rate constant K of magnesium alloy transverse structure are respectively 359,289,266μm3 / s. In addition, the higher the extrusion ratio, the faster the progress of the isothermal transformation of the semi-solid magnesium alloys is, the better the roundness and uniformity of the α grains are.