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采用Gleeble-3500热模拟实验机对轧制诱发熔化激活法制备的AZ91D镁合金半固态坯料在应变速率为0.001~10 s~(-1)、温度300~400℃的条件下进行了高温压缩行为研究,研究了应变速率与变形温度对试样显微组织的影响,分析了试样各变形区的显微组织特性。结果表明:应变速率与变形温度是影响试样显微组织的两个重要因素,应变速率越小,变形温度越高,晶粒平均尺寸越大,尺寸均匀性越好。经过热压缩,α-Mg固相颗粒沿垂直于压缩方向被压长,而“液相”则变化不明显,表明α-Mg固相颗粒有较好的塑性变形能力,“液相”的塑性变形能力较差。压缩试样不同变形区的显微组织特征明显不同:试样心部固相颗粒发生了明显变形,而其他部位固相颗粒变形程度不大;“液相”被挤压到了试样两侧,而固相没有发生明显偏聚,表明在压力加工中“液相”比固相颗粒更容易移动。
The compression behavior of AZ91D magnesium alloy semi-solid billet prepared by rolling-induced melt activation was investigated by Gleeble-3500 thermal simulator at a strain rate of 0.001-10 s -1 and a temperature of 300-400 ℃ The influence of strain rate and deformation temperature on the microstructure of the specimen was studied and studied. The microstructure and properties of the deformation zone were analyzed. The results show that the strain rate and deformation temperature are two important factors that affect the microstructure of the sample. The smaller the strain rate is, the higher the deformation temperature is. The larger the average grain size is, the better the size uniformity is. After thermal compression, α-Mg solid particles are compressed along the direction perpendicular to the compression, and the “liquid phase” does not change significantly, indicating that α-Mg solid particles have better plastic deformation ability, “liquid phase ”Plastic deformation ability is poor. The microstructural characteristics of compressive specimens in different deformation zones are obviously different: the solid particles in the heart of the sample have been obviously deformed, while the deformation of solid particles in other parts has not much deformation; the “liquid” is squeezed to the sample two Side, and the solid phase did not occur significant segregation, indicating that the pressure processing “liquid phase ” than the solid particles more easily move.