Transactions of Materials and Heat Treatment

Title：Influences of hot rolling pass on microstructure and mechanical properties for aged Mg-6Zn alloy car plate

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ClassificationCode：TG146

year,vol(issue):pagenumber：2020,45(11):44-48

Abstract：

In order to improve the comprehensive mechanical properties of plate used for vehicle lightweight, taking Mg-6Zn alloy as base test material, the influences of aging treatment and hot rolling pass on the microstructure and mechanical properties for alloy were analyzed by experiments. The results show that a large number of twin crystal are formed in the grain after one pass of hot rolling, and after three passes of hot rolling, the alloy has greater deformation and partially recrystallized grains. Furthermore, after five passes of hot rolling, the plates recrystallize to form many smaller grains, and after more passes of hot rolling, the Mg-6Zn alloy gains larger hardness. When the aging temperature reaches 175 ℃, many small-sized recrystallized grains are formed in the alloy, and the tensile strength is close to 250 MPa, and the elongation increases to 13.8%. However, after five passes of hot rolling, the fracture area produces many tearing edges and presents the characteristics of brittle fracture. As the temperature rises to 175 ℃, there are still a lot of tearing edges in the alloy, which are characterized by brittle fracture.

Funds：

重庆市教育委员会科学技术研究计划项目（KJZD-K201803201）

王亮亮（1982-），男，硕士，工程师 E-mail：duiju94ey@126.com

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