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Effect of dynamic plastic deformation on the microstructure and mechanical properties of an Al-Zn-Mg alloy

机译：动态塑性变形对Al-Zn-Mg合金微观结构和力学性能的影响

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摘要

A supersaturated Al-Zn-Mg alloy was processed by dynamic plastic deformation (DPD) using a Split-Hopkinson pressure bar (SHPB) facility with strain range from 0.5 to 1.5 and then subjected to compressive testing at strain rates of 1 × 10~(-3) -4 × 10~3 s~(-1). The results show that there is concurrent occurrence of grain refinement, increase in dislocation density and precipitation of fine precipitates in different morphologies during DPD at strain over 1. This enhances the yield strength of the Al alloy after DPD over the as-received material in peak-aging state (T6). Grains are refined through the formation of low angle grain boundaries (LAGBs) by rearrangement of dislocations which leads to the subdivision of original grains. Heterogeneous coarse precipitates mainly of T (Al_(20)Cu_2Mn_3) and E (Al_(18)Mg_3Cr_2) phases distribute along dislocations and grain boundaries after DPD. Dynamic precipitation of very fine η' and η during DPD occurs where the volume fraction of precipitates increases with increasing the number of presses. The influence of precipitates on the strain rate sensitivity is also discussed.
机译：通过动态塑性变形（DPD）使用分布式Hopkinson压力棒（SHPB）设施，应变范围为0.5至1.5，然后以1×10〜（ -3）-4×10〜3 s〜（-1）。结果表明，晶粒细化的同时发生，脱位密度增加，在菌株中的不同形貌中的脱位密度和细小沉淀沉淀的沉淀物。这提高了DPD在峰值上的AS接收物质之后Al合金的屈服强度 - 状态（T6）。通过重新排列脱位来通过形成低角度晶界（LAGBS）来精制晶粒，这导致原始晶粒细分。非均相粗沉淀，主要是T（Al_（20）Cu_2MN_3）和E（Al_（18）Mg_3Cr_2）相沿DPD后沿脱臼和晶界分布。在DPD期间非常细η'和η的动态沉淀发生，其中沉淀物的体积分数随着压力的数量而增加。还讨论了沉淀物对应变速率灵敏度的影响。

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  • 来源
    《Materials Science and Engineering》 |2020年第may15期|139287.1-139287.10|共10页
  • 作者

    Mohamed A. Afifi; Ying Chun Wang; Terence G. Langdon;

  • 作者单位

    School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China Brunei Centre for Advanced Solidification Technology (BCAST) Brunei University London Vxbridge UB8 3PH UK;

    School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China National Key Laboratory of Science and Technology on Materials Under Shock and Impact Beijing 100081 China;

    Materials Research Group Department of Mechanical Engineering University of Southampton Southampton SO17 1BJ UK;

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  • 正文语种 eng
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  • 关键词

    Al-Zn-Mg alloy; Dynamic plastic deformation; Precipitates; Split-Hopkinson pressure bar; Strain rate sensitivity;

    机译：Al-Zn-Mg合金;动态塑性变形;沉淀物;分裂霍普金森压力栏;应变率灵敏度;

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