4.7 Article

Study on the effects of manganese on the grain structure and mechanical properties of Mg-0.5Ce alloy

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141567

关键词

Mg alloy; Extrusion; Microstructure; Mechanical properties; Sandwich-like grain structure

资金

  1. National Natural Science Foundation of China [51531002, 51971042, 51901028]
  2. National Key Research and Development Program of China [2016YFB0301100]
  3. Youth Project of Science and Technology Research Program of Chongqing EducationCommission of China [KJ201903136636560]
  4. Chongqing Academician Special Fund [cstc2018jcyjyszxX0007, cstc2019yszxjcyjX0004, cstc2020yszxjcyjX0001, cstc2018jcyjAX0070]
  5. Sinoma Institute of Materials Research (Guang Zhou) Co., Ltd (SIMR)

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By controlling the Mn content in the alloy, a novel sandwich grain structure was achieved in Mg-Mn-Ce alloys, leading to improved mechanical properties.
A novel sandwich grain structure of an Mg-Mn-Ce alloy was achieved by controlling the content of Mn in the traditional extrusion process. The solid-state Mn was dynamically precipitated during the extrusion. These finely precipitated particles hindered the grain boundary migration and refined the dynamically recrystallized grains. A sandwich-like grain structure was formed in as-extruded Mg-Mn-Ce alloys with Mn content increasing from 0.3 wt% to 0.9 wt%. This sandwich-like grain structure induced a tensile yield stress (TYS) that was improved from 86.5 MPa to 166.7 MPa; the Mg-0.9Mn-0.5Ce alloy exhibited improved yield isotropy. Here we discuss the formation mechanism for the sandwich-like grain structure and the strengthening mechanism in detail.

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