高强铝合金热塑性变形本构关系研究现状及发展趋势

摘要/Abstract

摘要： 高强铝合金热成形工艺条件下的变形行为表征，需要在考虑温度、应变速率及应变影响的基础上结合微观演化行为建立热塑性本构关系。总结了高强铝合金热塑性变形本构关系相关研究成果。研究结果表明：广泛应用的唯象本构模型通过修正模型参数可以充分耦合应变、温度及应变速率作用，并准确地预测不同变形条件下的流动应力，然而缺乏对变形机制的明确解释，使得唯象本构模型对试验温度、应变速率变化范围较大以及试验条件范围外的变形行为预测精度难以得到保证；基于物理意义的本构模型能够模拟位错密度、晶粒尺寸及动态再结晶等微观演化过程，对流动应力进行精确计算，展现了强大的宏微观变形预测能力，是高强铝合金热塑性变形本构关系的研究趋势。

关键词: 高强铝合金, 热塑性变形, 本构关系, 本构模型

Abstract: In addition to temperature, strain rate and strain effects, microstructure evolution might be considered in hot plastic constitutive relation for deformation behavior characterization of high strength aluminum alloys in hot forming processes. Constitutive relation researches of high strength aluminum alloys in hot plastic deformation were summarized. The research results show that the widely applied phenomenal constitutive models may couple the effects of strain, temperature and strain rate by modifying model parameters and provide accurate prediction for the flow stresses. However, the phenomenal constitutive model prediction accuracy might not be guaranteed under the wide ranges of temperature and strain rate or out of the experimental scopes due to lacks of explanation on the deformation mechanism. The physical based constitutive models may calculate the flow stresses based on modeling the microstructural deformation behaviors such as dislocation density, grain size and dynamic recrystallization, which shows great ability in predicting both of macro and micro behaviors. Thus, this is the research trend of the constitutive relation for high strength aluminum alloys in hot plastic deformation.

Key words: high strength aluminum alloy, hot plastic deformation, constitutive relation； constitutive model

中图分类号:

TG146.2

陈明和;王宁. 高强铝合金热塑性变形本构关系研究现状及发展趋势[J]. 中国机械工程.

CHEN Minghe;WANG Ning. Current Research and Development Trends in Constitutive Relation for High Strength Aluminum Alloys in Hot Plastic Deformation[J]. China Mechanical Engineering.

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http://www.cmemo.org.cn/CN/Y2020/V31/I08/997

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