Ultrafine-grained Al-Mg-Zr alloy processed by shear-assisted extrusion with high thermal stability

Joseph R. Croteau*, Jae Gil Jung, Scott A. Whalen, Jens Darsell, Austin Mello, Dallas Holstine, Kylee Lay, Michael Hansen, David C. Dunand, Nhon Q. Vo

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Shear-assisted processing and extrusion (ShAPE) is used to consolidate Al-4.2Mg-1.6Zr-0.25Si-0.1Fe (wt.%) powders. The extruded alloy exhibits: (i) near-zero porosity; (ii) an attractive combination of tensile yield strength (~220 MPa), ultimate strength (330 MPa) and elongation (>20%); and (iii) excellent thermal stability at 400 °C. The ultra-fine grain size in the gas-atomized powders – created and stabilized by primary L12-Al3Zr submicron precipitates - is maintained after consolidation and subsequent exposure at 400 °C, contributing twice as much to strength as Mg in solid-solution. Electron microscopy reveals the microstructure of the L12-Al3Zr precipitates, and other precipitates (Mg2Si and Al3Fe) and dispersoids (oxides).

Original languageEnglish (US)
Pages (from-to)326-330
Number of pages5
JournalScripta Materialia
Volume186
DOIs
StatePublished - Sep 2020

Keywords

  • Friction extrusion
  • High-strength aluminum powder
  • Thermal stability
  • Ultra-fine grain

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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    Croteau, J. R., Jung, J. G., Whalen, S. A., Darsell, J., Mello, A., Holstine, D., Lay, K., Hansen, M., Dunand, D. C., & Vo, N. Q. (2020). Ultrafine-grained Al-Mg-Zr alloy processed by shear-assisted extrusion with high thermal stability. Scripta Materialia, 186, 326-330. https://doi.org/10.1016/j.scriptamat.2020.05.051