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首页> 外文会议>2006 BIMW >Investigation of Flow Stress Behavior and Microstructural Evolution of 7050 Al Alloy
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Investigation of Flow Stress Behavior and Microstructural Evolution of 7050 Al Alloy

机译：7050铝合金的流变应力行为与组织演变研究

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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：7050铝合金的塑性变形行为通过在250s〜450°C的温度范围内以0.01s〜（-1），1s〜（-1）和10s〜（-1）的恒定应变率进行压缩试验研究。结果表明，所有的流动曲线包括三个阶段，即应变硬化，应变软化和稳态应变。最初，应力在微应变变形时急剧上升，然后以减小的速率增加，然后应变软化直至稳态应力。应力水平随着变形温度的升高和应变速率的降低而减小，这可以通过指数型方程中的齐纳-霍尔洛门参数来表示，σ_r= 80.71·sinh〜（-1）[（1.64×10〜（-19） ·（Z）〜（-7）（r“ -Z）〜（-7.202）]观察到在晶界出现锯齿状的伸长晶粒;随着温度和位错密度的增加，动态再结晶（DRX）发生。晶粒在稳态时几乎是等轴的，可以得出结论，DRX现象对温度敏感，动态流软化主要是由于动态恢复和DRX的结果。

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