Microstructure and tensile behavior of a friction stir processed magnesium alloy

Bilal Mansoor, A. K. Ghosh

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

In this work the effect of multi-pass friction stir processing (FSP) followed by warm pressing on an as-extruded ZK60 Mg plate was investigated. The microstructure, texture and resulting mechanical properties are reported here. Multi-pass FSP to partial depths on the top and bottom plate surfaces produced a novel, layered structure with three distinct microstructural zones associated with stirred, transition and core regions. In the stirred zone, FSP, followed by pressing at 200 °C, created a 0.8 μm ultrafine grain size which accounts for ∼55 vol.% of the material. The transition region (∼10 vol.%), showed extensively sheared coarse grains distributed in a matrix of finer grains. However, the core region (∼35 vol.%) showed extensive twinning inside coarse grains in an overall bimodal microstructure reminiscent of extrusion. The processed Mg with a strong basal texture exhibited high yield strength (>300 MPa) and retention of adequate tensile ductility (>10%). The enhancement in mechanical properties of processed Mg is found to be highly influenced by the layered microstructure: UFG grained stirred zone, finer precipitates and strong basal texture.

Original languageEnglish
Pages (from-to)5079-5088
Number of pages10
JournalActa Materialia
Volume60
Issue number13-14
DOIs
Publication statusPublished - Aug 2012
Externally publishedYes

Fingerprint

Magnesium alloys
Textures
Friction
Microstructure
Processing
Mechanical properties
Twinning
Extrusion
Yield stress
Ductility
Precipitates

Keywords

  • Friction stir processing
  • Mg
  • Texture
  • UFG
  • ZK60

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Cite this

Microstructure and tensile behavior of a friction stir processed magnesium alloy. / Mansoor, Bilal; Ghosh, A. K.

In: Acta Materialia, Vol. 60, No. 13-14, 08.2012, p. 5079-5088.

Research output: Contribution to journalArticle

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