【摘要】 研究了SIMA法制备的半固态Al 4Cu Mg合金在不同变形温度、变形程度和应变速率下压缩变形时的微观组织演变 ,并研究了半固态Al 4Cu Mg合金在高温变形条件下的微观组织形态。研究结果表明 ,在半固态条件下 ,晶粒平均尺寸随变形温度的升高而增大 :从 5 40℃到 5 60℃ ,晶粒平均尺寸增大了 2 %～ 9% ,而从 5 60℃到 5 80℃ ,晶粒平均尺寸增大了3 %～ 16% ,后者的增幅比前者大。变形程度增大 ,晶粒平均尺寸减小 ,同一试样大变形区的晶粒平均尺寸比小变形区的晶粒平均尺寸小 4%～ 15 %。应变速率减小 ,晶粒平均尺寸增大 ,晶粒变得圆整更多还原

【Abstract】 Microstructural evolution of the semi-solid Al-4Cu-Mg alloy prepared by SIMA at different deformation temperatures and deformation degree as well as strain rates during isothermal compression process was investigated. Microstructure of the semi-solid alloy under high temperature deformation condition was observed also. The results showed that the average grain size increased by 2%～9% with deformation temperature increase from 540 ℃ to 560 ℃ and increase by 3%～16% from 560 ℃ to 580 ℃ while decreased with deformation degree increase. The average grain size in large deformation area was smaller by 4%～15% than in small deformation area in same specimen. Average grain size increased and grain became round with strain rates reduction.更多还原