锻压技术

ECAP对Al-3Fe-0.3Sc合金组织性能的影响规律

英文标题：Influence laws of ECAP on microstructure and properties for Al-3Fe-0.3Sc alloy

作者：赖昀昊钟明古文丽马乾康邓同生

分类号：TG376

出版年,卷(期):页码：2023,48(8):158-163

摘要：

在自制的等通道转角挤压（ECAP）模具中按Bc路径对Al-3Fe-0.3Sc合金方形棒料进行了不同道次的挤压变形，分析了挤压道次对合金微观组织、力学性能和电导率的影响规律。研究发现：ECAP变形后合金晶粒发生明显细化，晶粒呈现特定取向，长杆状铝铁相在剧烈的剪切变形条件下发生明显的破碎。合金经第1道次ECAP变形后抗拉强度由原始铸态的105 MPa升高至121 MPa，伸长率由5.7%大幅提升至25.7%，第2道次后抗拉强度和伸长率上升不明显。第1道次ECAP变形后合金的硬度由38.7 HV上升至53.5 HV，第4道次后上升至60.4 HV。电导率由铸态的42.9%IACS上升至第1道次的46.4%IACS，后续继续增加挤压道次，电导率基本保持不变。强度和电导率的提升主要是由于晶粒得到细化，发生的动态回复有利于变形过程中产生的高密度位错向亚晶界转变，减少了晶体中的空位缺陷。研究结果为铝铁合金的性能优化及实际应用提供了参考。

Al-3Fe-0.3Sc alloy square bars were extruded and deformed with different passes by a self-made equal channel angular pressing(ECAP) mold in the Bc route, and the influence laws of extrusion passes on microstructure, mechanical properties and electrical conductivity of alloy were analyzed. The research finds that after ECAP deformation, the alloy grains are obviously refined, the grains present a specific orientation, and the long rod-shaped aluminum-iron phases are obviously broken under severe shear deformation the conditions. After the first pass of ECAP deformation, the tensile strength of alloy increases from 105 MPa in the original as-cast state to 121 MPa, and the elongation increases significantly from 5.7% to 25.7%. After the second pass, the increasing of tensile strength and elongation is not obvious. The hardness of alloy increases from 38.7 HV to 53.5 HV after the first pass of ECAP deformation, and increases to 60.4 HV after the fourth pass. The electrical conductivity increases from 42.9%IACS in the as-cast state to 46.4%IACS in the first pass, and the electrical conductivity remains basically unchanged with the continuously increasing of extrusion pass. The increase of strength and electrical conductivity is mainly due to the grain refinement, and the dynamic recovery occurs that is conducive to the transformation of high-density dislocations generated during the deformation process to the sub-grain boundaries, which reduces the vacancy defects in the crystal. Thus, the research results provide a reference for the performance optimization and practical application of Al-Fe alloy.

基金项目：

江西省大学生创新创业训练计划项目（S202210407008，S202110407012）

作者简介：赖昀昊（2002-），男，本科生,E-mail：1347796687@qq.com;通信作者：邓同生（1987-），男，博士，副教授,E-mail：dts115@jxust.edu.cn

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