固溶温度对6013铝合金组织和性能的影响,Materials Chemistry and Physics

详细研究了Al-Mg-Si-Cu铝合金的成分、形成和热处理过程。然而，只有少数报道考虑了固溶处理对时效过程中6013铝合金组织和性能的影响。本研究通过力学性能测试、晶间腐蚀测试、电化学测试以及扫描和透射电子显微镜研究了固溶温度对6013铝合金组织和性能的影响。结果表明，当合金的固溶温度从 530 ℃增加到 570 ℃时，残余 Mg 2Si相逐渐减少，残留Al(FeMn)Si相的数量没有明显变化。随着固溶温度的升高，T6时效后合金的抗拉强度、显微硬度和耐腐蚀性能逐渐提高，而延伸率和电导率依次逐渐降低。透射电子显微镜显示观察到合金在 T6 状态下的 GP 区和 L 相。随着固溶温度的升高，GP区和L相的数量增加，从而提高了材料强度。晶界析出物数量逐渐减少，分布距离逐渐增大，从而减弱了晶间腐蚀。

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The components as well as the formation and heat treatment processes of the Al–Mg–Si–Cu aluminum alloy have been investigated in detail. However, only a few reports have considered the effects of solid solution treatment on the microstructure and properties of 6013 aluminum alloy during the aging process. In this study, the effects of solid solution temperature on the microstructure and properties of the 6013 aluminum alloy were studied via mechanical property testing, intergranular corrosion testing, electrochemical testing, and scanning and transmission electron microscopy. The results indicated that when the solid solution temperature of the alloy increased from 530 to 570 °C, the residual Mg2Si phase gradually decreased and the quantity of residual Al(FeMn)Si phase did not significantly change. As the solid solution temperature increased, the tensile strength, micro-hardness, and corrosion resistance of the alloy after T6 aging gradually increased, and the elongation and electrical conductivity, in turn, gradually decreased. Transmission electron microscopy depicted that the GP Zones and L phases of the alloy in the T6 state were observed. As the solid solution temperature increased, the quantity of the GP Zones and L phases increased, thereby increasing the material strength. The number of precipitates in the grain boundary gradually decreased, and the distribution distance gradually increased, which attenuated intergranular corrosion.