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

Metallurgical System Engineering

NanoAl LLC
Northwestern University
Korea Institute of Materials Science
Pacific Northwest National Laboratory
Boise State University

Research output: Contribution to journal › Journal article › peer-review

42 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
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 - 2020.09

Keywords

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

Access to Document

10.1016/j.scriptamat.2020.05.051

Cite this

@article{1d2790c86cb8455db909e126683dd70c,

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 (\textasciitilde{}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 = "Publisher Copyright: {\textcopyright} 2020 Acta Materialia Inc.",

year = "2020",

month = sep,

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

language = "English",

volume = "186",

pages = "326--330",

journal = "Scripta Materialia",

issn = "1359-6462",

}

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.

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

UR - https://www.scopus.com/pages/publications/85086633172

U2 - 10.1016/j.scriptamat.2020.05.051

DO - 10.1016/j.scriptamat.2020.05.051

M3 - Journal article

AN - SCOPUS:85086633172

SN - 1359-6462

VL - 186

SP - 326

EP - 330

JO - Scripta Materialia

JF - Scripta Materialia

ER -

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

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this