ECAP挤压对5083铝合金组织与力学性能的影响

Effect of Equal-channel Angular Pressing on Microstructure and Mechanical Properties of 5083 Al Alloy

研究了5083铝合金等通道转角挤压(ECAP)的室温拉伸性能。结果表明:5083铝合金经100℃、16道次ECAP挤压后,晶粒明显细化且第二相均匀弥散分布,合金的强度提高至480 MPa;200℃、16道次ECAP挤压后,合金强度有所下降(约380 MPa),但塑性显著改善(伸长率16%以上);降低ECAP挤压温度、增加挤压道次可获得更高的挤压硬化和细晶强化效果,在100℃ECAP挤压和200℃退火同样可提高该合金的抗拉强度和塑性变形能力。

The mechanical properties of equal-channel angular pressing （ECAP） 5083 A1 alloy were investigated under room-temperature tension. The results show that 5083 A1 alloy squeezed by ECAP process at 100℃ for 16 passes induces a remarkable grain refinement and a homogeneous dispersion distribution of second phases, and its tensile strength can reach as high as 480 MPa; the 5083 A1 alloy squeezed by ECAP process at 200℃ for 16 passes, its strength reduces （about 380 MPa） but plasticity markedly improves （elongation above 16%）;Reducing ECAP temperature and increasing ECAP passes can obtain the effect of higher extrusion hardening and fine-grain strengthening of the alloy. The combination of ECAP at 100 ℃ and subsequent annealing at 200℃ could simultaneously enhance its tensile strength and plastic deformation ability.