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Severe plastic deformation of 6061 aluminum alloy tube with pre and post heat treatments

机译：热处理前后6061铝合金管的严重塑性变形

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摘要

In this work, the 6061 aluminum alloy tubes are severely deformed through a novel method called Tube Channel Pressing (TCP). The ability of this process in improving mechanical properties, grain refinement and microstructural changes of the alloy with different heat treatments before and after TCP process is investigated. Results show that TCP has notable effect on grain refinement and decreases crystallite size of solid solution treated aluminum 6061 material to 52 nm after equivalent strain of 3.09 which is comparable with the measured data from other SPD processes. The strength of the specimens aged before TCP is higher than that of those aged after TCP. The specimens artificially aged after TCP show more sharp grain boundaries than those of others and lower dislocation density in grain interiors. Also, aging before TCP leads to finer precipitations than those formed in aging after TCP.
机译：在这项工作中，6061铝合金管通过一种称为管通道压制（TCP）的新方法而严重变形。研究了此工艺在TCP加工前后，通过不同热处理改善合金的机械性能，晶粒细化和显微组织变化的能力。结果表明，TCP对晶粒细化具有显着影响，在等效应变为3.09之后，固溶处理的铝6061材料的微晶尺寸减小至52 nm，这与其他SPD工艺的测量数据相当。 TCP之前老化的试样的强度高于TCP之后老化的试样的强度。经过TCP人工老化的样品比其他样品具有更清晰的晶界和较低的位错密度。而且，TCP之前的老化比TCP之后的老化产生的沉淀要细。

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