Transactions of Materials and Heat Treatment

Title：Influence of multi-directional die forging passes on microstructure and properties for Al-5Mg-0.3Mn alloy at room temperature

Authors： Zeng Chongyang Huang Hongfeng Chen Yuan Jiang Mai Wei Lili Liu Shuhui

Unit： Guilin University of Technology

KeyWords： Al-Mg alloy plastic deformation multi-directional die forging deformation strengthening fine grain strengthening

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2022,47(5):5-11

Abstract：

In order to improve the mechanical properties of Al-5Mg-0.3Mn alloy, the alloy ingot was subjected to the muli-directional die forging deformation with three passes (∑ε(3 pass)=2.34), six passes (∑ε(6 pass)=4.68) and nine passes (∑ε(9 pass)=7.02) at room temperature to achieve significant fine grain strengthening and deformation strengthening effects. The results of microstructure observation and mechanical properties testing for Al-5Mg-0.3Mn alloy forgings show that the multi-directional die forging can significantly refine alloy grain and improve the mechanical properties of alloy. Under the condition of low equivalent strain, matrix dislocations multiply rapidly and produce deformation strengthening, which greatly improves the mechanical properties of alloy. With the increasing of equivalent strain, the transformation of dislocations to grain boundaries makes the grains be refined remarkably, and the dislocations are consumed. However, the deformation strengthening is weaken, and the mechanical properties of alloy are slightly reduced. When the equivalent strain becomes 4.68, the Al-5Mg-0.3Mn alloy obtains the optimal mechanical properties, and the yield strength and tensile strength increase to 458 and 565 MPa, respectively.

Funds：

广西教育厅中青年教师基础能力提升计划基金(2019KY0265);桂林理工大学博士科研启动基金 (GLUTQD2016012、GLUTQD2016011)

作者简介：曾重阳（2000-），男，本科生，E-mail：1559490681@qq.com；通信作者：黄宏锋（1985-），男，博士，讲师，E-mail：csuworld@163.com

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