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研究了挤压铸造工艺对铝合金组织和性能的影响。结果表明,随着比压的增加,铝合金抗拉强度逐渐升高。比压较低时,主要表现为消除铸件缺陷;比压较高时,主要表现为提高合金液结晶性能,铸件晶粒得到细化,最佳比压强度150 MPa。铝合金铸件抗拉强度随铸型温度升高先增加后减小,最佳铸型温度220℃。随浇注温度升高,铝合金抗拉强度升高,最佳浇注温度770℃。铝合金抗拉强度随保压时间增加先增加后减小,保压时间25 s达到最大值。
The effects of squeeze casting process on microstructure and properties of aluminum alloy were studied. The results show that with the increase of specific pressure, the tensile strength of aluminum alloy gradually increases. When the specific pressure is lower, the main defect is to eliminate the defects of the castings. When the specific pressure is higher, the main performance is to improve the crystallization properties of the alloy liquid. The grain size of the castings is refined and the optimum specific compressive strength is 150 MPa. The tensile strength of aluminum alloy castings increases first and then decreases with the increase of mold temperature, and the best mold temperature is 220 ℃. With the pouring temperature increases, the tensile strength of aluminum alloy increases, the best pouring temperature 770 ℃. The tensile strength of aluminum alloy first increases and then decreases with the increase of dwell time, and the dwell time reaches its maximum at 25 s.