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首页> 外文期刊>Materials Science and Engineering >Effect of plastic deformation on the ageing behaviour of an Al-Cu-Mg alloywith a high Cu/Mg ratio
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Effect of plastic deformation on the ageing behaviour of an Al-Cu-Mg alloywith a high Cu/Mg ratio

机译：塑性变形对高Cu / Mg比Al-Cu-Mg合金时效行为的影响

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摘要

The effect of tensile strain ranging from 1% to 7% on the decomposition sequence and mechanical properties of an AA2519 alloy with low Si content is studied. Pre-straining promotes the precipitation of θ′- and Ω-phases at dislocations and suppresses the precipitation of GP-zones and θ″-phase. The aspect ratio (AR) of the homogeneously nucleated ΩΙ-phase is higher than that of the ΩΙΙ-phase nucleated on the θ′-phase/Al interfaces by a factor of ~ 4. Replacement of θ″-phase by a dispersion of θ′- and Ω-phases took place under peak-ageing condition and thus imparted only a minor hardening effect, despite a seven-fold increase in the volume fraction of the strengthening precipitates. An increase in the yield stress by 30% with increasing pre-strain from 1% to 7% is attributed to an increase in the lattice dislocation density. Over-ageing leads to replacement of the ΩΙΙ-phase by the θ′-phase.
机译：研究了1％至7％的拉伸应变对低Si含量的AA2519合金的分解顺序和力学性能的影响。预应变促进位错处的θ'相和Ω相的析出，并抑制GP区和θ''相的析出。均匀成核的Ω1相的长径比（AR）比在θ'相/ Al界面上成核的ΩII相的长宽比高约4倍。用θ的色散代替θ''相′相和Ω相发生在峰值时效条件下，尽管强化析出物的体积分数增加了7倍，但仅产生了很小的硬化作用。随着预应变从1％增加到7％，屈服应力增加30％，这归因于晶格位错密度的增加。过度老化导致以θ'相代替ΩIII相。

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