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首页> 外文期刊>Materials Science and Engineering >Effect of heat treatments on the microstructure of an ultrafine-grained Al- Zn-Mg alloy produced by powder metallurgy
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Effect of heat treatments on the microstructure of an ultrafine-grained Al- Zn-Mg alloy produced by powder metallurgy

机译：热处理对粉末冶金超细晶Al-Zn-Mg合金组织的影响

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摘要

Previous study by Queudet et al. [1] showed that powder metallurgy allows to produce high strength ultrafine-grained (UFG) Al-Zn-Mg alloys which contains both η' and η phases. This present work investigates the effects of solid solution treatment followed by quenching (W temper) and subsequent ageing to obtain theoretical T6 tempered UFG material. TEM analyses revealed the presence of GP zones and metastable η phase in W tempered UFG material. Compared to as-fabricated material, quenching conferred to the alloy higher maximum stress of 785 MPa and stabilized plastic flow. Further ageing resulted in over-aged alloy containing the η phase, inducing lower hardness and compressive stress. TEM observations showed that variant η_2 which grows from η' is delimited by previous GP-Ⅱ zones.
机译：Queudet等人先前的研究。文献[1]表明，粉末冶金可生产出既包含η'相又包含η相的高强度超细晶粒（UFG）Al-Zn-Mg合金。本工作研究固溶处理，淬火（W回火）和随后的时效处理以获得理论上经过T6回火的UFG材料的效果。 TEM分析表明，在W回火的UFG材料中存在GP区和亚稳η相。与加工后的材料相比，淬火赋予合金更高的最大应力785 MPa，并稳定了塑性流动。进一步的时效导致含有η相的过时效合金，导致较低的硬度和压应力。 TEM观察表明，由η'生长的变体η_2被先前的GP-Ⅱ区划界。

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