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利用自行研制的振动频率可调的倾斜冷却剪切实验装置制备半固态AlSi9Mg合金熔体,并与传统高压铸造工艺衔接,直接进行流变压铸,运用正交试验方法研究了固溶处理温度、保温时间、水淬介质温度对流变压铸试样抗拉强度的影响。结果表明:固溶处理温度为535℃,保温时间4 h,水温60℃,并经175℃×8 h人工时效后,流变压铸件的σb=277 MPa,δ=3.9%。流变压铸可实现低固相率半固态AlSi9Mg合金熔体的低气孔率压铸。与压力铸造相比,流变压铸可提高铸件的致密性和力学性能,伸长率提高尤为明显。
The semi-solid AlSi9Mg alloy melt was prepared by self-developed inclined cooling shear test device with adjustable vibration frequency. The melt was connected with the traditional high-pressure casting process and directly subjected to rheo-diecasting. The effects of solution treatment temperature, Time, the influence of water quenching medium temperature on the tensile strength of rheo - diecasting samples. The results show that the σb = 277 MPa and δ = 3.9% of the rheo - diecasting after the solution treatment at 535 ℃, holding time 4 h and water temperature 60 ℃, respectively, after 175 ℃ × 8 h artificial aging. Rheo-diecasting enables low porosity die-casting of semi-solid AlSi9Mg alloy melt with low solid fraction. Compared with the pressure casting, rheological die-casting can improve the density and mechanical properties of the casting, the increase in elongation is particularly evident.