通过热挤压和随后的径向剪切轧制加工的 Al-Zn-Mg-Ni-Fe 合金的微观结构和力学性能

Yu. V. Gamin, T. K. Akopyan, A. V. Skugorev, X. D. Nguyen, M. B. Savonkin, A. S. Prosviryakov, A. S. Fortuna, V. V. Cheverikin
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引用次数: 0

摘要

研究了通过热挤压(HE)、径向剪切轧制(RSR)和热处理(淬火 + 时效)生产的 Al-5.76Zn-1.77Mg-0.33Fe-0.45Ni(重量百分比)合金棒材的微观结构和机械性能的演变。研究结果表明,建议的热机械处理(TMT)可以产生特定类型的微观结构。HE 可使初始铸件结构发生无缺陷变形,而 RSR 则可在独特的温度-应变条件下形成精细的微观结构。在变形过程中,不溶解的 Al9NiFe 共晶相晶体被细化到约 100 纳米大小。这些晶体沿晶粒和亚晶粒边界分布,成为高角度和低角度晶粒边界迁移的有效障碍。因此,在所获得棒材的中心部分和近表面区域观察到了具有广泛低角度晶界网络的变形结构的形成(特别是在近表面区域,其等效应变约为 15)。平均特征亚晶粒尺寸(约 2 至 3 μm)与严重塑性变形过程中产生的晶粒尺寸相当,这种结构的形成提供了有利的机械性能组合(UTS ~ 416 MPa、YS ~ 293 MPa、δ ~ 8.4 pct),其机械性能可与等道角压制后类似合金的机械性能相媲美。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Microstructure and Mechanical Properties of Al–Zn–Mg–Ni–Fe Alloy Processed by Hot Extrusion and Subsequent Radial Shear Rolling

Microstructure and Mechanical Properties of Al–Zn–Mg–Ni–Fe Alloy Processed by Hot Extrusion and Subsequent Radial Shear Rolling

The evolution of the microstructure and mechanical properties of Al–5.76Zn–1.77Mg–0.33Fe−0.45Ni (wt pct) alloy bars produced by hot extrusion (HE) followed by radial shear rolling (RSR) and heat treatment (quenching + aging) has been studied. The results show that the suggested thermomechanical treatment (TMT) allows one to produce a specific type of microstructure. HE provides for defect-free deformation of the initial cast structure, while RSR leads to the formation of a fine microstructure due to unique temperature–strain conditions. During deformation, insoluble Al9NiFe eutectic phase crystals are refined to a size of about 100 nm. These crystals are localized along the grain and subgrain boundaries and act as effective barriers to the migration of high-angle and low-angle grain boundaries. As a result, the formation of a deformed structure with an extensive network of low-angle grain boundaries (especially in the near-surface region where the equivalent strain is about 15) is observed in the central part and in the near-surface region of the obtained bars. The formation of a structure with an average characteristic subgrain size (~ 2 to 3 μm) comparable to that of grains produced by severe plastic deformation processes provides for a favorable combination of mechanical properties (UTS ~ 416 MPa, YS ~ 293 MPa, δ ~ 8.4 pct), which are comparable to the mechanical properties of a similar alloy after equal channel angular pressing.

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