Transactions of Materials and Heat Treatment

Title：Influence of Cr element and different processes on microstructure and properties of Al-Mg-Si alloy

Authors： Chi Rui1 2 Xu Zhiyuan1 Meng Shuang1 Li Tao1 Li Yancheng1 Xu Yangfan1 Liu Mingzhao1

Unit： 1. National Engineering Research Center for Plastic Working of Aluminum Alloys Shandong Nanshan Aluminum Co． Ltd． 2. School of Materials Science and Engineering Yantai Nanshan University

KeyWords： Cr element temperature mechanical properties second phase grain size

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2024,49(8):88-93

Abstract：

The influences of Cr elements and different processes on the mechanical properties and microstructure of Al-Mg-Si alloy were analyzed by universal tensile testing machine, metallographic microscope and scanning electron microscope. The results show that after adding Cr element, the tensile strength and yield strength increase, and the increase of tensile strength is more significant. By increasing the hot rolling coiling temperature (360 ℃380 ℃) and pre-aging temperature (70 ℃80 ℃), and changing the quenching method (air coolingwater cooling),the tensile strength and yield strength is increased significantly, by about 13 MPa. Cr element has little effect on the size of dispersed phase, but it increases the number of dispersed phases. When the hot rolling coiling temperature increases from 300 ℃ to 360 ℃, the average grain size decreases from 25.96 μm to 23 μm. When the hot rolling temperature rises to 380 ℃, the grain coarsening occurs. The addition of elements also has a significant impact on the type of second phase. After adding Cr element, AlFeMnSi phase transforms into Al(FeMnCr)Si phase,the black second phase is Mg2Si phase, and its quantity and size decrease with the increasing of Cr element.

Funds：

山东省重点研发计划（2021SFGC1001）

作者简介：迟蕊（1992-），女，硕士，中级工程师 E-mail：chirui@nanshan.com.cn

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