Effect of Sr additions on the microstructure and mechanical properties of Mg-Al-Ca alloys

Akane Suzuki, Nicholas D. Saddock, Laura Riester, Edgar Lara-Curzio, J. Wayne Jones, Tresa M. Pollock

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The effect of Sr additions on the microstructure and mechanical properties of Mg-Al-Ca alloys was investigated using Mg-5Al-3(Ca, Sr) and Mg-4Al-4(Ca, Sr) quaternary alloys (wt%). The Mg-5Al-3(Ca, Sr) quaternary alloys consist of dendritic α-Mg phase and intermetallic phases, C36-(Mg, Al)2Ca and Mg17Sr2, along the grain boundaries. The formation of the Mg17Sr2 phase was observed in alloys containing more than 0.25wt% Sr. The mechanical properties of these alloys were tested in compression at room temperature and 448 K. At both temperatures, the flow stress decreased with Sr content up to 0.5wt%, and then increased with Sr concentration. The composition of the α-Mg phase measured by EPMA and the hardness and elastic modulus of the α-Mg phase measured by nanoindentation indicate that the latter increase in the flow stress is caused by solid solution strengthening of the α-Mg phase by Al.

Original languageEnglish
Title of host publicationMagnesium Technology
Pages523-528
Number of pages6
StatePublished - 2006
EventTMS 2006 Annual Meeting - Magnesium Technology - San Antonio, TX, United States
Duration: Mar 12 2006Mar 16 2006

Publication series

NameMagnesium Technology
Volume2006
ISSN (Print)1545-4150

Conference

ConferenceTMS 2006 Annual Meeting - Magnesium Technology
Country/TerritoryUnited States
CitySan Antonio, TX
Period03/12/0603/16/06

Keywords

  • Compression test
  • Nanoindentation
  • Phase identification

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