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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

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Microstructures and mechanical properties of double hot-extruded AZ80+xSr wrought alloys
GUAN Shao-kang(关绍康), ZHU Shi-jie(朱世杰), WANG Li-guo(王利国),YANG Qing(杨 卿), CAO Wen-bo(曹文博)

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China

Abstract:The effects of Sr addition on microstructures and tensile properties of the as-cast and hot-extruded AZ80 alloys were studied by OM, SEM, EDS, XRD, DSC and Instron tester. The results show that the microstructures of as-cast alloys consist of α-Mg and β-Mg17Al12 phase. Sr gathers on the boundaries, and dissolves into β-Mg17Al12 phase or forms Mg17Sr2 phase. The grains of as-cast alloys are refined and discontinuous net-shaped structure is formed. The compound phases on the boundaries become thicker with increasing Sr content. The ultimate tensile stress(UTS) and elongation are improved compared with the corresponding Sr-free alloy. After preliminary hot-extruding, the UTS is up to 308−320 MPa and elongation reaches 8.0%−13.5%. After double hot-extrudtion, the dynamic recrystallization completes totally, and the UTS is up to 310−355 MPa, but the elongation does not change apparently. The alloy with 0.02%Sr (mass fraction) obtains the best comprehensive performance with the UTS of 355 MPa and elongation of 13.2%. The SEM morphology of fracture surface shows that the alloys with Sr present good ductility after double hot-extrution.

 

Key words: AZ80 magnesium alloy; Sr; double hot-extrution; ultimate tensile strength; elongation

ISSN 1672-7029
CN 43-1423/U

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