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Microstructure and tensile properties of solutionized Mg-3.52Sn-3.32Al alloy deformed by equal channel angular pressing
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1.Xi''an University of Technology;2.Guangdong Provincial Key Laboratory for Technology and Application of Metal Toughening, Guangdong Institute of Materials and Processing;3.Xi''an Technological University

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Shaanxi Provincial Science and Technology Plan Project (2010K10-08); the Scientific Research Project of Education Department of Shaanxi Province (2013JK0906); the fund of Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices (No.ZSKJ201302); Natural Science Foundation of Guangdong Province (2016A030313802); Project on Scientific Research of Guangzhou City (201707010393).

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    Abstract:

    The solutionized Mg-3.52Sn-3.32Al(wt.%) alloy was processed by equal channel angular pressing (ECAP) via route Bc for 1, 4, and 8 passes, respectively. The microstructure and phase composition of the alloy were analyzed by optical microscope, scanning electron microscopy, transmission electron microscopy and X-ray diffraction, and the room-temperature mechanical properties were measured. The results show that many fine Mg2Sn particles and a few Mg17Al12 phases precipitate in the alloy after ECAP. The mechanical properties of the alloy first increase and then decrease gradually with increasing extrusion passes. The alloy possesses better mechanical properties after ECAP for four passes, the ultimate tensile strength, elongation and hardness increase to 250 MPa, 20.5% and 61.3 HV9.8 respectively, which is increased by 43.7%, 105% and 26.9% compared with the solutionized alloy. The room temperature fractograph of the ECAP processed alloy is ductile-fractured morphology under tensile condition.The mechanical properties of the ECAP processed Mg alloy is dependent on the grain size, precipitate and texture.

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[zhang zhongming, HUANG Zhenghua, Ren Weiwei, Xu Chunjie, Xi Zengzhe. Microstructure and tensile properties of solutionized Mg-3.52Sn-3.32Al alloy deformed by equal channel angular pressing[J]. Rare Metal Materials and Engineering,2019,48(2):385~393.]
DOI:10.12442/j. issn.1002-185X.20170814

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History
  • Received:September 08,2017
  • Revised:February 15,2019
  • Adopted:September 14,2018
  • Online: March 15,2019
  • Published: