热处理参数对5052铝合金板材力学性能的影响研究

Research on the effect of heat treatment parameters on mechanical properties of 5052 aluminum alloy

摘要:

铝合金具有密度低、重量轻、耐腐蚀、比强度高等优点,是结构轻量化设计的首选材料,但是其力学性能受铝合金的最终热处理状态和变形条件的影响很大。以5052-H32铝合金冷轧板为研究对象,借助于单向拉伸试验、硬度测试对不同热处理参数条件下的力学性能进行研究,分析不同热处理工艺参数对5052铝合金力学性能参数的影响机制,结果表明：对5052-H32铝合金进行再次热处理时,可以显著的降低其变形抗力,提高塑性变形能力；在热处理过程中的加热温度起主要作用,在合理的热处理温度和保温时间条件下,冷却方式对5052铝合金的强度、硬度的影响不大。在此基础上,借助Johnson-Cook模型建立了再次热处理后5052铝合金板材的本构模型。

Abstract:

Aluminum alloy has the advantages of low density, light weight, corrosion resistance and high specific strength, so it is the first choice material for structural lightweight design. However, its mechanical properties are greatly affected on the final heat treatment state and deformation conditions of aluminum alloy. Take the 5052-H32 as the research object, the mechanical properties was studied under the condition of different heat treatment parameters by uniaxial tensile test and hardness test, and the influence mechanism of different heat treatment parameters on mechanical properties of 5052 aluminum alloy was analyzed, the results showed that, The deformation resistance of 5052-H32 aluminum alloy can be significantly reduced and its plastic deformation ability can be improved during re-heat treatment. The heating temperature plays a major role in the process of heat treatment, the cooling mode has little influence on the strength and hardness of 5052 aluminum alloy under the reasonable heat treatment temperature and holding time. On this basis, the constitutive model of 5052 aluminum alloy after re-heat treatment was established by johnson-cook model.