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
Publication date 2013-12-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.msea.2013.09.027
Volume 588
Start page 181
End page 187
Total pages 7
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Language eng
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
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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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
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