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采用大挤压比热挤压预变形的SIMA法制备了5083铝合金半固态坯料,研究了在不同加热温度和保温时间条件下二次加热重熔组织的演变规律,以及不同工艺参数对一道次触变轧制后带材力学性能的影响。结果表明,在二次加热过程中,晶粒形状和液相率主要受加热温度影响,而受加热保温时间的影响不大。在一道次触变轧制中,当二次加热温度为600℃,轧制变形量为60%时,可以获得抗拉强度为260.93MPa,伸长率为26.81%的较好综合力学性能的带材。经40%变形量二次冷轧后,带材的抗拉强度提高了70MPa。结合拉伸断口的宏观和微观形貌分析,可知带材的断裂方式为微孔聚集型的韧性断裂。
5083 aluminum alloy semi-solid billet was prepared by SIMA method with large extrusion ratio and hot extrusion. The evolution of secondary remelted structure under different heating temperature and holding time was studied, and the effects of different process parameters on one pass Effect of thixotropic rolling strip mechanical properties. The results show that in the second heating process, the grain shape and the liquid phase rate are mainly affected by the heating temperature, but not by the heat holding time. In one-time thixotropic rolling, when the secondary heating temperature is 600 ° C and the amount of rolling deformation is 60%, a strip with better overall mechanical properties with a tensile strength of 260.93 MPa and an elongation of 26.81% can be obtained material. After 40% deformation of the second cold-rolled, the tensile strength of the strip increased by 70MPa. According to the macroscopic and microscopic morphological analysis of the tensile fracture, we can see that the fracture mode of the tapes is the ductile fracture of micropore aggregation type.