Subscribe to the EPMA Mailing List

Novel in-situ Formed Al-AlN Ultrafine-Grained Composites Prepared from Fine Nitrided Al Powders

  • : Martin Balog 1, 2, Ma Qian 2, De-Shin Liu 3, Yeau-Ren Jeng 3, Tomas Svantner 1, 4, Frantisek Simancik 1
  • : 1ISlovak Academy of Sciences, 2The University of Queensland, 3National Chung Cheng University, 4Slovak University of Technology 1ISlovak Academy of Sciences, 2The University of Queensland, 3National Chung Cheng University, 4Slovak University of Technology 1ISlovak Academy of Sciences, 2The University of Queensland, 3National Chung Cheng University, 4Slovak University of Technology 1ISlovak Academy of Sciences, 2The University of Queensland, 3National Chung Cheng University, 4Slovak University of Technology 1ISlovak Academy of Sciences, 2The University of Queensland, 3National Chung Cheng University, 4Slovak University of Technology
  • : 2013, Vol 3, p. 107-112
  • : PDF Download
  • : 2013

Abstract

This paper reports the development of novel Sintered Aluminium Powder (SAP)-like Al-AlN nanocomposites based on a concept of replacing the native Al2O3 thin films on fine Al powder with a large volume of in-situ formed nanometric AlN dispersoids. Fine gas-atomized Al powder (d50=1.3 µm) green compacts were first partially nitrided at 590 °C in flowing nitrogen, controlled by a small addition of Sn (0.3-0.4wt.%). The compacts were subsequently consolidated by hot working compaction techniques (direct extrusion and forging). The resulting Al-AlN composites consisted of sub-micrometric Al grains reinforced by nanometric AlN dispersoids, and a small presence of nanometric Al2O3 dispersoids. Al-13vol.% AlN nanocomposite exhibited attractive high temperature mechanical properties and thermal stability. The properties of in-situ Al-13vol.% AlN nanocomposite are compared to in-situ Al-2.3vol.% Al2O3 composites fabricated from the same fine Al powder and to the high Al2O3 content SAP materials.

Free

Other publications you may be interested in:

Go To Top