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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Hot deformation behavior and dynamic recrystallization constitutive modeling of Al-Cu-Mg powder compacts processed by extrusion at elevated temperatures
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Hot deformation behavior and dynamic recrystallization constitutive modeling of Al-Cu-Mg powder compacts processed by extrusion at elevated temperatures

机译：升高温度下挤出加工的铝铜粉粉块的热变形行为及动态再结晶本构建模

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摘要

The deformation behavior of Al-Cu-Mg sintered preforms has been investigated by extrusion in the temperature range of 450-550 degrees C and strain rate range of 0.1-0.3 s(-1), respectively. The aim of this study is to analyze the effect of initial preform relative density on the hot deformation behavior and to model and predict the flow stress of extruded samples using constitutive equations. The true stress-strain curves exhibit three stages of deformation, which represent work hardening, dynamic recovery, and dynamic recrystallization during deformation at different temperatures, strain rates, and initial preform relative densities of 70%, 80%, and 90%, respectively. The results show that the flow stress values are influenced by initial preform relative density, deformation temperature, and strain rate. Microstructural examination of extruded specimens has been performed by optical microscopy and scanning electron microscopy. Arrhenius-type constitutive equations are developed to predict the flow stress of hot-extruded powder metallurgy processed aluminum alloy (Al-4%Cu-0.5%Mg). Zener-Hollomon parameter is used to explain the relationship between peak flow stress, temperature, and strain rate in an exponential equation containing the deformation activation energy and material constants. Subsequently, the statistical indicators correlation coefficient (R) and the average absolute relative error are assessed to confirm the validity of constitutive equations. The results indicate the experimental and predicted peak flow stress values are in good agreement, which indicate the accuracy and reliability of the developed model for powder metallurgy processed Al-4%Cu-0.5%Mg preforms.
机译：通过在450-550℃的温度范围和0.1-0.3s（-1）的应变率范围内的挤出，研究了Al-Cu-Mg烧结预制件的变形行为。本研究的目的是分析初始预制件相对密度对热变形行为的影响和模型，并使用本构方程预测挤出样品的流量应力。真正的应力 - 应变曲线表现出三个变形阶段，其代表在不同温度，应变率，初始预制率和90％的初始预制率相对密度的变形期间的工作硬化，动态回收和动态重结晶。结果表明，流量应力值受初始预制件相对密度，变形温度和应变率的影响。通过光学显微镜和扫描电子显微镜进行挤出样品的微观结构检查。开发了Arhenius型本构方程以预测热挤出粉末冶金加工铝合金的流量应力（Al-4％Cu-0.5％Mg）。 Zener-Hollomon参数用于解释包含变形激活能量和材料常数的指数方程中峰值流量应力，温度和应变率之间的关系。随后，评估统计指标相关系数（R）和平均绝对相对误差以确认本构方程的有效性。结果表明实验和预测的峰值流量值良好一致，这表明粉末冶金加工型Al-4％Cu-0.5％Mg预成型件的开发模型的准确性和可靠性。

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