7075铝合金高温挤压过程动态再结晶行为与织构控制

Dynamic Recrystallization Behavior and Texture Control in High-Temperature Extrusion of 7075 Aluminum Alloy

摘要

7075铝合金以其高比强度、优良的耐疲劳性能和良好的加工性，被广泛应用于航空航天、交通运输及高端装备制造领域。高温挤压成形是实现其复杂构件高性能制造的重要工艺，其中动态再结晶（DRX）行为及织构演化对组织均匀化和力学性能具有决定性作用。本文系统综述了7075铝合金在高温变形下的DRX机制，探讨温度、应变速率、合金成分及预处理工艺等因素对再结晶行为和织构形成的影响，分析晶粒细化、位错演变与亚结构演化的微观规律。研究结果表明，通过工艺参数与热力学条件的优化，可有效调控织构类型，提升材料强度与塑性，为高端铝合金构件的精密制造提供理论依据与工艺指导。

Abstract

7075 aluminum alloy, renowned for its high specific strength, excellent fatigue resistance, and superior processability, is extensively utilized in aerospace, transportation, and advanced equipment manufacturing. High-temperature extrusion molding serves as a critical process for producing high-performance complex components, where dynamic recrystallization (DRX) behavior and texture evolution play decisive roles in achieving uniform microstructure and enhanced mechanical properties. This paper systematically reviews the DRX mechanisms of 7075 aluminum alloy under high-temperature deformation, investigates the influence of temperature, strain rate, alloy composition, and pre-treatment processes on recrystallization behavior and texture formation, and analyzes the microscopic mechanisms of grain refinement, dislocation evolution, and substructure development. The research demonstrates that optimizing process parameters and thermodynamic conditions can effectively regulate texture types, improve material strength and ductility, and provide theoretical foundations and process guidance for precision manufacturing of advanced aluminum alloy components.

关键词

7075铝合金 / 高温挤压 / 动态再结晶

Key words

7075 aluminum alloy / high temperature extrusion / dynamic recrystallization

参考文献

[1] 徐沛. 7075铝合金热变形行为研究[D]. 哈尔滨理工大学, 2023.

[2] 张现亮. TiB₂颗粒增强7075铝基复合材料挤压型材组织与性能研究[D]. 山东大学, 2023.

[3] 熊盛开. 铝合金挤压铸造扭转复合成形过程的多尺度研究[D]. 湖南科技大学, 2023.

[4] 刘明材. 7075铝合金重复连续挤压组织与性能研究[D]. 湖南大学, 2022.