Acta Metallurgica Sinica (English Letters) ›› 2012, Vol. 25 ›› Issue (1): 65-75.DOI: 10.11890/1006-7191-121-65

• 研究论文 • 上一篇    下一篇

Processing of AZ31 magnesium alloy by accumulative roll-bonding at gradient temperature

詹美燕1,李春明2,张卫文3,张大童4   

  1. 1. 华南理工大学材料学院
    2. 华南理工大学材料科学与工程学院
    3.
    4. 华南理工大学机械工程学院
  • 收稿日期:2011-08-11 修回日期:2011-11-07 出版日期:2012-02-25 发布日期:2012-02-16
  • 通讯作者: 詹美燕

Processing of AZ31 magnesium alloy by accumulative roll-bonding at gradient temperature

Meiyan ZHAN1,Chunming LI1, Weiwen ZHANG2, Datong ZHANG2
   

  1. 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640,
    2. National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China
  • Received:2011-08-11 Revised:2011-11-07 Online:2012-02-25 Published:2012-02-16
  • Contact: Meiyan ZHAN

PDF (PC)

1036

摘要： In the present investigation a wrought magnesium alloy AZ31 was successfully processed by the accumulative roll-bonding (ARB) at gradient temperature up to six cycles with the lowest temperature of 250℃. This is performed through different thermomechanical processing routes (different ARB cycles at different temperatures of 350℃ - 200℃). The microstructures and mechanical properties were investigated. The results indicate that significant grain refinement is observed after the first two cycles at the highest ARB temperature as a result of dynamic recrystallization, which is necessary for the subsequently ARB cycles at relatively lower temperature with the aim to restrict grain growth. No significant finer grain size is observed through the fifth and sixth cycles while the microstructure homogeneity is further improved. The grain structure can be effectively refined at lower ARB processing temperature and higher cycles. The resulting material exhibited high strength and relatively high ductility at ambient temperature when ARBed above 250℃. The mechanical properties of the ARB deformed materials are strongly dependent on several main factors: the amount and the homogeneity of strain achieved, grain size and microstructure homogeneity, textures developed during ARB and interface bonding quality.

Abstract: In the present investigation a wrought magnesium alloy AZ31 was successfully processed by the accumulative roll-bonding (ARB) at gradient temperature up to six cycles with the lowest temperature of 250℃. This is performed through different thermomechanical processing routes (different ARB cycles at different temperatures of 350-200℃). The microstructures and mechanical properties were investigated. The results indicate  that significant grain refinement is observed after the first two cycles at the highest ARB temperature as a result of dynamic recrystallization, which is necessary for the subsequently ARB cycles at relatively lower temperature with the aim to restrict grain growth. No significant finer grain size was observed through the fifth and sixth cycles while the microstructure homogeneity is further improved. The grain structure can be effectively refined at lower ARB processing temperature and higher cycles. The resulting material exhibited high strength and relatively high ductility at ambient temperature when ARB deformed above 250℃. The mechanical properties of the ARB deformed materials are strongly dependent on several main factors: the amount and the homogeneity of strain achieved, grain size and microstructure homogeneity, textures developed during ARB and interface bonding quality.

Key words: Mg-Al-Zn magnesium alloy, Accumulative roll-bonding, Microstructure, Mechanical properties