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Investigation of Flow Stress Behavior and Microstructural Evolution of 7050 Al Alloy

机译：7050 Al合金的流量应力行为和微观结构演化研究

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摘要

The plastic deformation behaviors of 7050 Al alloy were investigated by compression tests at temperatures ranging of 250°C～450°C under constant strain rates of 0.01s~(-1), 1s~(-1) and 10s~(-1). The results showed that all the flow curves consisted of three stages, i.e. strain-hardening, strain-softening and steady state-strain. Initially, the stress rises steeply at microstrain deformation, and then increases at a decreased rate, followed by a strain-softening until a steady state stress. The stress level decreases with increasing deformation temperature and decreasing strain rate, which can be represented by a Zener-Hollomon parameter in an exponent-type equation, σ_r = 80.71·sinh ~(-1)[(1.64×10~(-19)·Z)~(-7)(r"-Z)~(-7.202)] Elongated grains with serrations developed in the grain boundaries were observed; the dynamic recrystallization (DRX) occurs with increasing temperature and dislocation density, and the shape of grain at steady state is nearly equiaxial. It can be concluded that the DRX phenomenon is sensitive to the temperature and the dynamic flow softening is mainly as the result of dynamic recovery and DRX.
机译：通过在0.01s〜（-1）的恒定应变率下的250℃〜450℃的温度下压缩试验来研究7050 al合金的塑性变形行为，1s〜（-1）和10s〜（-1） 。结果表明，所有流动曲线由三个阶段组成，即应变硬化，菌株软化和稳态 - 应变。最初，压力陡峭地升高在微纹状体变形下，然后以降低的速率增加，然后进行应变软化，直至稳态应力。压力水平随着变形温度的增加和应变速率降低，其可以通过指数型方程中的ZENER-HOLLOMON参数表示，σ_r= 80.71·sinh〜（-1）[（1.64×10〜（-19） ·Z）〜（-7）（R“-Z）〜（-7.202）〜（-7.202）]观察到在晶界中开发的锯齿的细长颗粒;动态再结晶（DRX）随着温度和位错密度的增加而发生稳定状态的谷物几乎是均匀的。可以得出结论，DRX现象对温度敏感，动态流动软化主要是动态回收和DRX的结果。

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