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Response to T6 heat treatment of extruded and thixoformed EN AW 2014 alloys

机译：挤压和触变EN AW 2014合金对T6热处理的响应

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摘要

Response to T6 heat treatment of extruded and thixoformed 2014 aluminium alloy was investigated in the present work. Peak hardness is attained after 16 h at an ageing temperature of 160℃ following a solution heat treatment at 500 ℃ in both alloys. While the time-to-peak hardness is the same in extruded and thixoformed 2014 alloys, the peak hardness obtained with the latter is higher, suggesting a superior age hardening capacity for the latter. The favourable impact of the thixoforming process is attributed to the change in grain boundary chemistry upon thixoforming. The segregation of Si, as well as of Cu, to the grain boundaries during soaking prior to thixoforming facilitates the formation of the ternary Al-Cu-Si eutectic with a relatively lower melting point at the grain boundaries. It is easier to dissolve the eutectic network at the grain boundaries and at triple junctions than coarse Al_2Cu particles entrapped inside the grains. The thixoformed alloy thus enjoys a higher amount of solute Cu after the solution heat treatment and a higher age hardening capacity.
机译：在本工作中，研究了挤压和触变2014铝合金对T6热处理的响应。在两种合金中，在500℃进行固溶热处理后，在160℃的时效温度下经过16小时后，都达到了峰值硬度。尽管挤压和触变2014合金的峰时硬度相同，但后者获得的峰值硬度更高，表明后者具有更高的时效硬化能力。触变成形过程的有利影响归因于触变成形时晶界化学的变化。在触变成形之前的浸泡过程中，Si和Cu偏析到晶界上，有利于在晶界处形成较低熔点的三元Al-Cu-Si共晶。与在晶粒内部和三重结处溶解的共晶网络相比，更容易溶解在晶粒内部的Al_2Cu粗颗粒。触变成形合金因此在固溶热处理后具有较高的固溶铜量和较高的时效硬化能力。

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