Improving the microstructure and mechanical properties of a cast Mg-9AL-1Zn alloy using friction stir processing

Wai Hoe Loke, Raafat Ibrahim, Sri Lathabai

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Friction stir processing (FSP) is a novel thermo-mechanical technique for modifying the microstructure of metals and alloys at targeted locations. In the present study, the microstructures and mechanical properties of friction stir processed Mg-9Al-1Zn (AZ91) alloy were evaluated. 4 mm thick sand cast AZ91 plates with a coarse dendritic microstructure and visible intermetallic phase were processed using single-pass FSP with different combinations of tool rotational and traverse speeds. Significant grain refinement (<10 μm), elimination of casting defects and the dissolution of intermetallic phase were observed at the stir zone (SZ) of all tested specimens. Microhardness tests showed increased microhardness along the SZ with a more uniform microhardness profile as compared to the regions outside the SZ. Mechanical properties evaluation using shear punch testing and subsequent microstructure analysis performed using scanning electron microscopy and microchemical analysis using Energy Dispersive Spectroscopy are discussed in this paper.

Original languageEnglish
Title of host publicationSuperplasticity in Advanced Materials
Subtitle of host publicationICSAM 2015
EditorsEiichi Sato, Goroh Itoh, Yoshimasa Takayama, Koichi Kitazono, Koji Morita, Takaomi Itoi, Junya Kobayashi
Place of PublicationPfaffikon Switzerland
PublisherTrans Tech Publications
Number of pages6
ISBN (Electronic)9783035701531
ISBN (Print)9783038356721
Publication statusPublished - 2016
EventInternational Conference on Superplasticity in Advanced Materials (ICSAM 2015) - Ito International Research Center, Tokyo, Japan
Duration: 7 Sep 201511 Sep 2015
Conference number: 12th

Publication series

NameMaterials Science Forum
PublisherTrans Tech Publications
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


ConferenceInternational Conference on Superplasticity in Advanced Materials (ICSAM 2015)
Abbreviated titleICSAM 2015
Internet address


  • Friction stir processing
  • Grain refinement
  • Magnesium alloy

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