SAP-like ultrafine-grained Al composites dispersion strengthened with nanometric AlN

Balog M., Krizik P., Yan M., Simancik F., Schaffer G.B. and Qian M. (2013) SAP-like ultrafine-grained Al composites dispersion strengthened with nanometric AlN. Materials Science and Engineering A, 588 181-187. doi:10.1016/j.msea.2013.09.027


Author Balog M.
Krizik P.
Yan M.
Simancik F.
Schaffer G.B.
Qian M.
Title SAP-like ultrafine-grained Al composites dispersion strengthened with nanometric AlN
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2013-12-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.msea.2013.09.027
Open Access Status
Volume 588
Start page 181
End page 187
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Language eng
Subject 2500 Materials Science
3104 Condensed Matter Physics
2211 Mechanics of Materials
2210 Mechanical Engineering
Abstract This paper reports the development of novel Sinter-Aluminum-Pulver (SAP)-like Al-AlN nanocomposites via replacing the native AlO thin films on fine Al powder with a large volume fraction of in situ formed nanometric AlN dispersoids. Fine gas-atomized Al powder (d=1.3μm) compacts were first partially nitrided at 590°C in flowing nitrogen, controlled by a small addition of Sn (0.3-0.4wt%), and subsequently consolidated by hot direct extrusion. The resulting Al-AlN composites consisted of submicrometric Al grains reinforced with nanometric AlN dispersoids together with some nanometric AlO dispersoids. An Al-13vol% AlN nanocomposite fabricated this way achieved exceptional ultimate tensile strength of 227MPa, yield strength of 195MPa and Young's modulus of 66GPa at 300°C, superior to typical SAP materials and coarse grained Al-AlN composites. In addition, the Al-13vol% AlN nanocomposite exhibited good thermal stability up to 500°C. The strengthening mechanism is discussed.
Formatted abstract
This paper reports the development of novel Sinter-Aluminum-Pulver (SAP)-like Al-AlN nanocomposites via replacing the native Al2O3 thin films on fine Al powder with a large volume fraction of in situ formed nanometric AlN dispersoids. Fine gas-atomized Al powder (d50=1.3μm) compacts were first partially nitrided at 590°C in flowing nitrogen, controlled by a small addition of Sn (0.3-0.4wt%), and subsequently consolidated by hot direct extrusion. The resulting Al-AlN composites consisted of submicrometric Al grains reinforced with nanometric AlN dispersoids together with some nanometric Al2O3 dispersoids. An Al-13vol% AlN nanocomposite fabricated this way achieved exceptional ultimate tensile strength of 227MPa, yield strength of 195MPa and Young's modulus of 66GPa at 300°C, superior to typical SAP materials and coarse grained Al-AlN composites. In addition, the Al-13vol% AlN nanocomposite exhibited good thermal stability up to 500°C. The strengthening mechanism is discussed.
Keyword Aluminum alloys
Composites
Electron microscopy
Mechanical characterization
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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