Transactions of Materials and Heat Treatment

Title：nfluence of T5 heat treatment on tension-compression asymmetry for Mg-Gd-Y-Zr-Ag alloy cylindrical parts

Authors： Li Mengyuan Liu Chuming Zhang Dongdong Wan Yingchun Jiang Shunong Chen Zhiyong

Unit： School of Materials Science and Engineering Central South University

KeyWords： heat treatment tension-compression asymmetry Mg-Gd-Y-Zr alloy mechanical properties β′ precipitate phase aging treatment

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2022,47(12):193-199

Abstract：

The inhomogeneity of microstructure and the properties and the tension-compression asymmetry for large-sized Mg-9.17Gd-1.98Y-0.43Zr-0.11Ag magnesium alloy cylindrical part were analyzed by mechanical property testing, backscattered electron diffraction, X-ray diffraction and transmission electron characterization, and the mechanical properties of material were improved by aging treatment to regulate the alloy microstructure. The results show that from the inside to the outside, the microstructure of cylinder part is unevenly distributed, the average grain size is coarsened from 12.9 μm to 20.1 μm, the tensile strength is reduced from 327 MPa to 280 MPa, and the yield strength is reduced from 223 MPa to 157 MPa. After peak aging at 225 °C×21 h, as the main precipitation phase, β′ phase inhibits the generation of twins under compression load, greatly increases the strength of cylinder part and reduces its elongation, and the ratio of compressive yield strength to tensile yield strength is 1.06, 1.17 and 1.02 from the inside to the outside, respectively. After T5 heat treatment, the internal mechanical properties of cylindrical part are the best with the tensile strength of 407 MPa, the yield strength of 293 MPa and the elongation of 12%.

Funds：

国家自然科学基金资助项目（51574291,51874367）

李梦媛（1997-），女，硕士研究生 E-mail：1015704955@qq.com 通信作者：刘楚明（1960-），男，博士，教授 E-mail：cmliu@csu.edu.cn

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