Transactions of Materials and Heat Treatment

Title：Influence of annealing temperature on tensile fracture performance at room temperature of AZ91D magnesium alloy sheets for car

Authors： Wang Liangjun She Yinzhu

Unit：（Department of Mechanical Engineering Taiyuan Institute of Technology Taiyuan 030008 China）

KeyWords： AZ91D magnesium alloy sheet annealing temperature grain size tensile fracture fracture mechanism

ClassificationCode：TG166

year,vol(issue):pagenumber：2019,44(2):155-158

Abstract：

Through metallographic microscopy tester and mechanical tensile test instrument, the tensile mechanical properties at room temperature and fracture structures of AZ91D magnesium alloy plate for car under annealing temperatures

of 500-700 ℃ were analyzed. The results show that the grain size of AZ91D magnesium alloy increases gradually and the tensile strength decreases gradually with the increase of annealing temperature. While the elongation increases first and then decreases，and the maximum value is obtained at 600 ℃. Furthermore, the average grain sizes of sample under annealing temperature of 500, 600 and 700 ℃ are 4.3, 8.5 and 15.6 μm respectively. With the increase of annealing temperature, the twinning structure in the microstructure near the tensile fracture increases, and the hole becomes smaller. The fracture zone of magnesium alloy plate obtained at 500 ℃ annealing has an obvious crack, and with the increase of annealing temperature, the tensile fracture mechanism of plate is a mixed fracture with microporous aggregate fracture and cleavage fracture.

Funds：

基金项目:山西省自然科学基金资助项目（20140321014-02）

作者简介：王亮军（1977-），男，硕士，讲师 Email：glott@126.com

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