Nanoscaled Al-AlN composites consolidated by equal channel angular pressing (ECAP) of partially in situ nitrided Al powder

Balog, M., Yu, P., Qian, M., Behulova, M., Svec, P., Sr. and Cicka, R. (2013) Nanoscaled Al-AlN composites consolidated by equal channel angular pressing (ECAP) of partially in situ nitrided Al powder. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 562 190-195. doi:10.1016/j.msea.2012.11.040


Author Balog, M.
Yu, P.
Qian, M.
Behulova, M.
Svec, P., Sr.
Cicka, R.
Title Nanoscaled Al-AlN composites consolidated by equal channel angular pressing (ECAP) of partially in situ nitrided Al powder
Journal name Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2013-02
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.msea.2012.11.040
Volume 562
Start page 190
End page 195
Total pages 6
Place of publication Lausanne, Switzerland
Publisher Elsevier
Collection year 2014
Language eng
Abstract Nanoscaled aluminium nitride (AlN) reinforced aluminium matrix composites were fabricated using a novel approach where powder mixtures of Al+Mg+Sn were partially in situ nitrided in flowing nitrogen followed by consolidation through equal channel angular pressing (ECAP). The resulting composites contain up to 23.8. vol% of AlN with relative density >98%. The microstructure shows two distinctively different alternate lamellar regions. One is the Al matrix free of AlN and the other is composed of nanoscaled AlN embedded in the Al matrix. The Al-AlN composites fabricated this way exhibited attractive properties, including thermal stability up to 450 °C, high compressive strength, high Young's modulus and low coefficient of thermal expansion. The presence of nanoscaled AlN reduced the thermal conductivity of the composites compared to the high thermal conductivity of Al-AlN composites prepared by metal infiltration techniques.
Keyword Aluminium (Al)
Aluminium nitride (AlN)
Equal channel angular pressing (ECAP)
Metal matrix composite (MMC)
Powder metallurgy (PM)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 20 November 2012.

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