TY - GEN
T1 - Novel in-situ formed Al-AlN ultrafine-grained composites prepared from fine nitrided Al powders
AU - Balog, Martin
AU - Qian, Ma
AU - Liu, De Shin
AU - Jeng, Yeau Ren
AU - Svantner, Tomas
AU - Simancik, Frantisek
PY - 2013/1/1
Y1 - 2013/1/1
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:85067747822
T3 - International Powder Metallurgy Congress and Exhibition, Euro PM 2013
BT - International Powder Metallurgy Congress and Exhibition, Euro PM 2013
PB - European Powder Metallurgy Association (EPMA)
T2 - International Powder Metallurgy Congress and Exhibition, Euro PM 2013
Y2 - 15 September 2013 through 18 September 2013
ER -