Mechanical properties and microstructure of extruded 6061 aluminum alloy

doi:10.13251/j.issn.0254-6051.2020.09.032

Abstract

Abstract: As-extruded 6061 aluminum alloy was subjected to solution treatment and aging treatment,respectively.The mechanical properties of the alloy were tested by universal testing machine,and the microstructure was characterized by means of SEM and TEM to investigate the microstructure evolution law of the alloy in different heat treatment states.The results show that the extruded 6061 aluminum alloy after solution treatment and aging treatment show obvious anisotropic mechanical properties,and aging treatment can effectively improve the strength of the alloy.At the same time,the extruded alloy after aging treatment shows strain rate sensitivity,however,the alloy after solution treatment has no obvious strain rate sensitivity.The extruded 6061 aluminum alloy after solution treatment and aging treatment are composed of equiaxed grains with two kinds of grain sizes,which the larger one being up to 200 μm and the smaller one being less than 10 μm.The types and strength of texture components of the extruded 6061 aluminum alloy solution-treated or as-aged are the same,both are composed of strong {001} <100>cubic texture and weak {011} <100>Goss texture.After tensile deformation,a large number of dislocations pile up,and the short rod like precipitates will be evenly distributed in the alloy after aging treatment,which can effectively block the movement of dislocations and improve the deformation resistance of materials.

Key words: extruded 6061 aluminum alloy, heat treatment, mechanical properties, microstructure

CLC Number:

TG146.2

Liu Wei, Wu Yuanzhi, Deng Bin, Liu Anmin, Liu Wei, Xu Ziyan, Ye Tuo. Mechanical properties and microstructure of extruded 6061 aluminum alloy[J]. Heat Treatment of Metals, 2020, 45(9): 172-177.

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