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Overview on the microstructure and mechanical properties of ultrafine-grained Al-Li alloys produced by severe plastic deformation
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College of Mechanics and Materials,Hohai University

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the Fundamental Research Funds for the Central Universities (Grant No. HHU2016B10314);Qing Lan Project and Six Major Talent Peaks Project of Jiangsu Province of China (Grant No.2014-XCL-023);Public Science & Technology Service Platform Program of Suqian City of China(Grant No. M201614)

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    Abstract:

    In recent years, fabrication of bulk ultrafine-grained (UFG) Al-Li alloys via severe plastic deformation (SPD) techniques has been investigated to improve properties for expanding its applications as structural products. This review reveals microstructure and mechanical properties of Al-Li alloys produced by SPD techniques. It focuses on the microstructure evolution during SPD, with the influence of internal and external factors. The strengthening mechanism of Al-Li alloys mainly based on precipitation hardening is presented. It is demonstrated that UFG Al-Li may attain enhanced strength with relatively good ductility via grain refinement and multiple precipitates. Special attention is given to the superplasticity of UFG Al-Li alloys, especially to the high strain rate superplasticity (HSR SP). It suggests that UFG Al-Mg-Li alloy produced by SPD, particularly by equal-channel angular pressing (ECAP), is a promising candidate material for use in superplastic forming operations.

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[Yuan Ting, Jiang Jinghua, Wang Lisha, Ma Aibin. Overview on the microstructure and mechanical properties of ultrafine-grained Al-Li alloys produced by severe plastic deformation[J]. Rare Metal Materials and Engineering,2019,48(1):55~62.]
DOI:10.12442/j. issn.1002-185X.20170586

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History
  • Received:July 03,2017
  • Revised:August 18,2017
  • Adopted:September 11,2017
  • Online: February 18,2019
  • Published: