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采用应变诱发熔化激活工艺 (SIMA)制备了半固态Al 4Cu Mg合金 ,并对其组织性能进行了研究。结果表明 :通过合理选择SIMA工艺参数 ,能够得到晶粒尺寸小且呈近球状的半固态组织 ;SIMA工艺参数对晶粒的大小和形状产生较大的影响。变形量越大、等温温度越低和保温时间越短 ,晶粒尺寸越小 ;变形量越大、等温温度越高和保温时间越长 ,分形维数越小 ,晶粒越圆整 ;采用变形量为 2 0 %～ 2 5 %、等温温度为 5 80～ 60 0℃和保温时间为 2～ 6min的合理SIMA工艺参数 ,可获得室温抗压强度和屈服强度分别为 3 5 8～ 3 87MPa和 2 46～ 2 65MPa的半固态材料。
Semi-solid Al 4Cu Mg alloy was prepared by strain-induced melting activation process (SIMA) and its microstructure and properties were studied. The results show that the SIMA process parameters can be used to obtain semi-solid microstructure with small grain size and almost spherical shape. SIMA process parameters have a great influence on the size and shape of the grains. The larger the deformation, the lower the isothermal temperature and the shorter the holding time, the smaller the grain size. The larger the deformation, the higher the isothermal temperature and the longer the holding time, the smaller the fractal dimension and the more rounded the grain. SIMA process parameters of 20% ~ 25%, isothermal temperature of 5 80 ~ 60 0 ℃ and holding time of 2 ~ 6min, the compressive strength and yield strength at room temperature are respectively 35.8 ~ 377MPa and 2 46 ~ 2 65MPa semi-solid material.