Effect of homogenization on microstructure and properties of extruded bars of medium-high strength Al-1.1Mg-1.2Si-0.7Mn alloy
The influence of homogenization process on the microstructure and properties of medium-high strength Al-1.1Mg-1.2Si-0.7Mn alloy extruded bars was studied with SEM,tensile test,hardness analysis,conductivity measurement and other instruments and meth-ods.The results indicate that the low-melting-point eutectic of the test alloy begins to melt at 587℃.As temperature increases in single-stage homogenization,the Mg2Si eutectic phase in the ingots and extruded products gradually decreases,and surface roughness of the extru-ded bars gradually decreases,while the thickness of the coarse grain ring significantly in-creases(more significant when it exceeds 525℃).In addition,to investigate the effect of low-temperature homogenization on the precipitation of Mn containing phases,two-stage homogenization was conducted at low temperature(430℃3 h)+high temperature(550℃8 h)and high temperature(550℃8 h)+low temperature(430℃3 h).Two-stage homog-enization doesn't play a great role in controlling the precipitation of Mn-containing phase or suppressing coarse grain.Different homogenization processes for the ingots have little effect on the properties of T6 extruded bars.
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