范俊锴,贾增辉,汪程鹏,刘伟

• 1:河南理工大学机械与动力工程学院
• 2:自然资源部天津海水淡化与综合利用研究所

摘要(Abstract)：

超细晶金属材料具有优异的综合性能，剧烈塑性变形(Severe plastic deformation, SPD)是制备块体金属超细晶材料的一种重要方法。目前国内外已经提出了多种SPD超细晶制备工艺，但要实现其工业化生产还有许多问题，这突出体现在材料损伤严重、变形均匀性差和模具结构复杂等多个方面。基于金属在挤压通道内的塑性变形特征，本文提出了一种新的块体金属超细晶制备方法-非对称梯度挤压(Asymmetric gradient extrusion, AGE)工艺。采用有限元方法结合挤压试验，探究了纯铜在AGE条件下的塑性变形特征。为了验证AGE方法在制备超细晶方法中的优势，对比分析了纯铜在等弯通道挤压(Equal-channel angular pressing, ECAP)和AGE多道次循环挤压条件下的等效应变累积特征和损伤演化规律。结果表明：AGE与ECAP的单道次应变均值基本相同，但AGE在变形均匀性和损伤累积方面均优于ECAP。AGE在制备金属超细晶材料方面表现出了明显的优势。

关键词(KeyWords)： 纯铜;非对称梯度挤压;超细晶;ECAP;剧烈塑性变形

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51405136);; 河南省科技厅科技攻关计划项目(212102210004);; 河南理工大学青年骨干教师资助计划(2020XQG-01);河南理工大学创新型科研团队资助(T2019-5)

作者(Author): 范俊锴,贾增辉,汪程鹏,刘伟

DOI: 10.13289/j.issn.1009-6264.2022-0168

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