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采用Gleeble-1500热模拟试验机对3003铝合金进行变形温度为300~500℃,应变速率为0.01~10.0 s-1高温等温压缩实验,利用Zener-Hollomon参数模型建立了合金热变形峰值流变应力本构模型。结合显微组织观察分析,3003铝合金热变形软化机制主要是动态再结晶,随着ln Z值的减小,动态再结晶进行得越充分;ln Z值较大时,3003铝合金热变形过程中的软化机制主要以动态回复为主,据此获得合金发生动态再结晶的临界条件为T≥400℃,ln Z≤31.98。由应变硬化速率计算合金发生动态再结晶的临界应变为ε>εc=0.00532ln Z-0.12452,其大小与Z参数成正比关系。
3003 aluminum alloy was subjected to high temperature isothermal compression test at 300-500 ℃ and strain rate of 0.01-10.0 s-1 using Gleeble-1500 thermal simulation tester. The peak flow stress of the alloy was established by Zener-Hollomon parameter model Constitutive model. According to the microstructure observation and analysis, the hot deformation softening mechanism of 3003 aluminum alloy is mainly dynamic recrystallization. The dynamic recrystallization proceeds more fully with the decrease of ln Z value. When the value of ln Z is large, the thermal deformation process of 3003 aluminum alloy The main softening mechanism in the main dynamic response, the resulting dynamic recrystallization alloy critical conditions for the T ≥ 400 ℃, ln Z ≤ 31.98. The critical strain for the dynamic recrystallization of the alloy calculated from strain hardening rate is ε> εc = 0.00532ln Z-0.12452, and its size is proportional to the Z parameter.