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首页> 外文会议>2006 BIMW >Evolution of Flow Stress and Microstructure in an AI-Zn-MgSeries Alloy During Hot Deformation
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Evolution of Flow Stress and Microstructure in an AI-Zn-MgSeries Alloy During Hot Deformation

机译：热变形过程中AI-Zn-Mg系列合金流动应力和组织的演变

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Evolution of flow stress and microstructures of an Al-Zn-Mg series alloy during deformation at elevated temperatures and large ranges of strain rates have been investigated by isothermal compression testing on Gleeble 1500 thermomechanical simulator. The results showed that the flow stress exhibited a characteristic of peak stress followed by smoothing out in the imposed strain rate and temperature ranges. The hot deformation of the alloy is a thermally activated process, which is controlled by rate-controlling mechanisms of dislocation generation and dislocation annihilation. The flow stress decreases with the increase of true strain at higher temperature and lower strain rate, indicating that dynamic softening dominates instead of strain hardening during hot deformation of the alloy. Microstructure observation revealed that typical subgrain cluster structures obviously developed in the original elongated grains of the alloy during hot deformation. The subgrain size of the alloy increased with deformation temperature and downturn of strain rate, where the Zener-Hollomon parameter increased. Fine equiaxed recrystallized grains with large-angle grain boundaries developed significantly in the alloy during hot compression at low Z values, implying activation of dynamic recrystallization.
机译：通过在Gleeble 1500热力学模拟器上进行等温压缩试验，研究了高温变形和大应变速率范围内Al-Zn-Mg系列合金的流动应力和微观结构的演变。结果表明，流动应力表现出峰值应力的特征，随后在施加的应变速率和温度范围内趋于平滑。合金的热变形是热活化过程，其受位错产生和位错an灭的速率控制机制控制。在较高的温度和较低的应变速率下，流动应力随着真实应变的增加而减小，这表明在合金的热变形过程中，动态软化占主导地位，而不是应变硬化。显微组织观察表明，在热变形过程中，典型的亚晶粒簇结构明显地出现在合金的原始细长晶粒中。合金的亚晶粒尺寸随着变形温度和应变速率的下降而增加，其中Zener-Hollomon参数增加。在低Z值的热压缩过程中，合金中具有大角度晶界的细等轴重结晶晶粒显着发展，这意味着激活了动态重结晶。

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