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Influence of cumulative strain on microstructure and mechanical properties of multi-directional forged 2A14 aluminum alloy

机译：累积应变对多向锻造2A14铝合金组织和力学性能的影响

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摘要

2A14 aluminum alloy was subjected to multidirectional forging (MDF) with a constant strain rate at 350 ℃, to different cumulative strain. The effects of cumulative strain on microstructure and mechanical properties of 2A14 aluminum alloy were investigated. The inhomogeneity of deformation during MDF was improved and grains of the alloy were gradually refined by increasing cumulative strain, while dislocation density first increased and then decreased with increasing cumulative strain in the range 0.4-7.2. After subsequent T6 aging, fine and equiaxed recrystallization grains with large-angle grain boundaries were more easily formed at relatively higher cumulative strain, and the optimized mechanical properties were achieved when cumulative strain was up to 3.6, with ultimate tensile strength of 505 MPa, yield strength of 435 MPa, Vickers hardness of 178 Hv and elongation of 16.8% at room temperature. The improvement in mechanical properties of the alloy was attributed to the presence of fine recrystallized grains which are uniformly distributed and high dislocation density, as well as precipitation strengthening.
机译：2A14铝合金在350℃下以恒定的应变速率进行多向锻造（MDF），以产生不同的累积应变。研究了累积应变对2A14铝合金组织和力学性能的影响。随着累积应变的增加，MDF变形的不均匀性得到改善，合金晶粒逐渐细化，而位错密度在0.4-7.2范围内随着累积应变的增加而先增大然后减小。在随后的T6时效处理之后，在相对较高的累积应变下，更容易形成具有大角度晶界的细小和等轴重结晶晶粒，当累积应变高达3.6时，具有505 MPa的极限抗拉强度，从而获得了最佳的机械性能。室温下的强度为435 MPa，维氏硬度为178 Hv，伸长率为16.8％。合金机械性能的改善归因于细小再结晶晶粒的存在，这些晶粒均匀分布且位错密度高，并且析出强化。

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