Age hardening in die-cast Mg-Al-RE alloys due to minor Mn additions

S.M. Zhu, Trevor Abbott, M.A. Gibson, J.F. Nie, M. A. Easton

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35 Citations (Scopus)

Abstract

Die-cast Mg-Al-rare earth (RE) alloys are normally used in the as-cast condition without the application of heat treatment because it is a common perception that heat treatment will not provide benefit to these alloys. This paper reports, for the first time, that enhanced age hardenability can be achieved in die-cast Mg-Al-RE alloys with minor Mn additions. For example, the yield strength of Mg-4. wt%Al-3. wt%La alloy with 0.32. wt% Mn is increased by ~34. MPa (~26%) after ageing at 200. °C for 32. h (T5). The enhanced age hardenability is associated with the precipitation of nanoscale Al-Mn particles during ageing.

Original languageEnglish
Pages (from-to)34-38
Number of pages5
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume656
DOIs
Publication statusPublished - 22 Feb 2016

Keywords

  • Ageing
  • Die-casting
  • Magnesium alloys
  • Mn additions
  • Precipitation

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