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

doi:10.1016/j.scriptamat.2020.05.051

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

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

15 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 language	English (US)
Pages (from-to)	326-330
Number of pages	5
Journal	Scripta Materialia
Volume	186
DOIs	https://doi.org/10.1016/j.scriptamat.2020.05.051
State	Published - 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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10.1016/j.scriptamat.2020.05.051

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

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).",

keywords = "Friction extrusion, High-strength aluminum powder, Thermal stability, Ultra-fine grain",

author = "Croteau, {Joseph R.} and Jung, {Jae Gil} and Whalen, {Scott A.} and Jens Darsell and Austin Mello and Dallas Holstine and Kylee Lay and Michael Hansen and Dunand, {David C.} and Vo, {Nhon Q.}",

note = "Funding Information: JGJ acknowledges KIMS for the award of a scholarship to carry out part of this work at Northwestern University. This research did not receive financial support from funding agencies in the public, commercial, or not-for-profit sectors. Publisher Copyright: {\textcopyright} 2020 Acta Materialia Inc.",

year = "2020",

month = sep,

doi = "10.1016/j.scriptamat.2020.05.051",

language = "English (US)",

volume = "186",

pages = "326--330",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Ultrafine-grained Al-Mg-Zr alloy processed by shear-assisted extrusion with high thermal stability

AU - Croteau, Joseph R.

AU - Jung, Jae Gil

AU - Whalen, Scott A.

AU - Darsell, Jens

AU - Mello, Austin

AU - Holstine, Dallas

AU - Lay, Kylee

AU - Hansen, Michael

AU - Dunand, David C.

AU - Vo, Nhon Q.

N1 - Funding Information: JGJ acknowledges KIMS for the award of a scholarship to carry out part of this work at Northwestern University. This research did not receive financial support from funding agencies in the public, commercial, or not-for-profit sectors. Publisher Copyright: © 2020 Acta Materialia Inc.

PY - 2020/9

Y1 - 2020/9

N2 - 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).

AB - 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).

KW - Friction extrusion

KW - High-strength aluminum powder

KW - Thermal stability

KW - Ultra-fine grain

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DO - 10.1016/j.scriptamat.2020.05.051

M3 - Article

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VL - 186

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EP - 330

JO - Scripta Materialia

JF - Scripta Materialia

ER -

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

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ASJC Scopus subject areas

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