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首页> 外文期刊>Journal of Materials Engineering and Performance >Achieving Grain Refinement and Related Mechanical Property Improvement of an Al-Zn-Mg-Cu Alloy Through Severe Plastic Deformation
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Achieving Grain Refinement and Related Mechanical Property Improvement of an Al-Zn-Mg-Cu Alloy Through Severe Plastic Deformation

机译：通过严重塑性变形实现Al-Zn-Mg-Cu合金的晶粒细化和相关力学性能

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摘要

Microstructural features and mechanical properties of an Al-Zn-Mg-Cu alloy processed by equal-channel angular pressing (ECAP) have been investigated. The equivalent plastic strain obtained from the simulation agrees well with that from the analytical calculation in a way that both increase with an increase in deformation, but the strain distribution is non-uniform, appearing as a strain gradient along the norm direction. Microstructure investigation shows that grain refinement is achieved in frequency of low-angle grain boundaries fabricated by ECAP. The pole density is reduced by ECAP, during which the Brass and Goss type textures are introduced. TEM results show chain-like recrystallized grains formed at the grain boundaries and broken second-phase particles come into being due to the heavy shear force. After ECAP, the hardness and strength increase significantly while the elongation is reduced. Besides, an extreme strengthening is confirmed because of the balance between dynamic hardening and softening. The microstructure evolution mechanism is revealed in terms of grain refinement, precipitate phase breakage and texture evolution.
机译：研究了通过等通道角压（ECAP）处理的Al-Zn-Mg-Cu合金的微观结构特征和机械性能。从模拟中获得的等效塑性应变与来自分析计算的方式吻合良好，以便随着变形的增加而增加，但应变分布是不均匀的，出现为沿规范方向的应变梯度。微观结构研究表明，在ECAP制造的低角度晶界的频率下实现了晶粒细化。通过ENAP减少了极密度，在此期间介绍了黄铜和高级纹理。 TEM结果表明，在晶界形成的链状重结晶颗粒，并且由于重剪切力，破碎的第二相颗粒成面。在ECAP之后，硬度和强度在减少伸长率时显着增加。此外，由于动态硬化和软化之间的平衡，确认了极端的强化。在晶粒细化方面揭示了微观结构演化机制，沉淀相破裂和纹理演化。

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