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Microstructure evolution and micro/nano mechanical properties of AZ91 magnesium alloy tube by spinning
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1.Taiyuan University of Technology

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    Abstract:

    In this study, multi-pass spinning of AZ91 magnesium alloy tube was conducted by power forward spinning. The microstructural evolution, phaseStransformation and micro mechanical properties were examined by opticalSmicroscope, SEM-EBSD-EDS, and nano-indentation tests. The results show that when the wall thickness of AZ91 magnesium alloy tube reduced by 88.33%, the surface was well formed without cracks or folds. In the initial stage of spinning, plastic deformation mainly occurred on the outer surface of magnesium alloy. With the spinning deformation increased, the deformation of inner and outer surface tended to be consistent. The brittle phase Mg17Al12 broke down and distributed with a streamline shape in magnesium alloy. At the same time, the grain of magnesium alloy refined and dynamic recrystallization occurred. With the increase of deformation, the strength of tubular parts increased, and the hardness was up to 1.036 GPa. The strengthening modes mainly include second phase dispersion strengthening and fine grain strengthening.

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[Zhang Yuanqi, Wang Wenxian, Chen Hongsheng, Cao Xiaoqing, Zhang Tingting, Zhang Yuyang. Microstructure evolution and micro/nano mechanical properties of AZ91 magnesium alloy tube by spinning[J]. Rare Metal Materials and Engineering,2019,48(2):580~586.]
DOI:10.12442/j. issn.1002-185X.20170600

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History
  • Received:July 07,2017
  • Revised:September 05,2017
  • Adopted:September 12,2017
  • Online: March 15,2019
  • Published: