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预时效6201铝合金重复连续挤压组织与力学性能
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Microstructure and Mechanical Property of Pre-aged 6201 Aluminum Alloy Processed by R-Conform Process
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    利用电子背散射衍射、透射电子显微镜、X射线衍射仪、偏光金相显微镜和拉伸试验对连铸连轧6201铝合金经预时效及随后重复连续挤压过程中组织和性能进行研究.结果表明: 6201铝合金的强塑积随着挤压道次的增加逐渐增加,从原始的2.93 GPa·%增加到第四道次的4.85 GPa·%,之后趋于平稳.预时效后合金析出了大量的β″相,随着重复连续挤压道次的增加,晶粒有效细化且组织变得更加均匀,晶粒平均尺寸从259 μm细化至60 μm;合金中高密度的位错逐渐缠结、塞积并向亚晶界转变,时效析出的针状β″相逐渐回溶到合金基体中.力学性能的变化是晶粒细化与均匀化、位错组态的变化以及弥散的β″相回溶的综合结果.

    Abstract:

    The repetitive continuous extrusion forming process(R-Conform process)was carried out on the pre-aged 6201 Al alloy produced by continuous casting and rolling.The microstructure characteristic and mechanical property evolution of the R-Conform processed alloy were investigated using electron back-scatter diffraction(EBSD),transmission electron microscopy(TEM),X-ray diffractometer,polarizing metallographic microscopy,and tensile testing. The results show that R-Conform can effectively refine grain size and homogenize alloy microstructure. With the increase of R-Conform pass numbers, the balance of strength-ductility(TS×EL) increased from 2.93 GPa·% to 4.85 GPa·% after fourth passes,and then stabilized.A large number of β″ phases precipitated in the pre-aged 6201 Al alloy after pre-aging. With the increase of R-Conform pass numbers, the grain was effectively refined and the homogenized alloy microstructure was formed, where the average size of the grain was refined from 259 μm to 60 μm.Meanwhile,high density of dislocations formed,gradually tangled with each other,and finally transformed to subgrain boundaries.A part of needle β″ phases dissolved into the Al alloy matrix. The evolution of the mechanical property was mainly attributed to the combined effect of grain refinement and homogenization,the synthetic effect of dislocation increase and the dissolution of β″ phases.

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傅定发?覮,张文刚,胡加敏,滕杰,张辉.预时效6201铝合金重复连续挤压组织与力学性能[J].湖南大学学报:自然科学版,2018,45(12):24~28

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  • 在线发布日期: 2019-01-11
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