Novel in-situ formed Al-AlN ultrafine-grained composites prepared from fine nitrided Al powders

Martin Balog, Ma Qian, De Shin Liu, Yeau Ren Jeng, Tomas Svantner, Frantisek Simancik

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationInternational Powder Metallurgy Congress and Exhibition, Euro PM 2013
PublisherEuropean Powder Metallurgy Association (EPMA)
ISBN (Electronic)9781899072408
Publication statusPublished - 2013 Jan 1
EventInternational Powder Metallurgy Congress and Exhibition, Euro PM 2013 - Gothenburg, Sweden
Duration: 2013 Sep 152013 Sep 18

Publication series

NameInternational Powder Metallurgy Congress and Exhibition, Euro PM 2013

Conference

ConferenceInternational Powder Metallurgy Congress and Exhibition, Euro PM 2013
CountrySweden
CityGothenburg
Period13-09-1513-09-18

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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