TY - JOUR
T1 - Synthesis, processing and properties of nanophase aluminide
AU - Chang, Hyuk
AU - Höfler, Jurgen
AU - Altstetter, Carl
AU - Averback, Robert
N1 - This researchw as supporteidn part by the Department of Energy, Basic Energy Science contract DEFG02-91ER45439O.n eof us (H.C.) acknowledges the support of the College of Engineeringa nd the Federationo f AdvancedM aterialsI ndustries(F AMI) of the Departmenotf MaterialsS ciencea ndEngineer-ing. We also wishto thankt hep ersonneolf the Center for Microanalysiosf MaterialsR esearchL aboratoryo f the Universityo f Illinois at Urbana-Champaigfonr theira ssistance.
PY - 1992/5/30
Y1 - 1992/5/30
N2 - This paper presents recent results on the production and properties of compacts of ultrafine powders of γ-TiAl. Metallic vapor was produced by magnetron sputtering of a TiAl target and inert gas-mediated condensation of nanometer sized particles. After collection, the particles were compacted in situ under ultrahigh vacuum conditions. The material was characterized by X-ray diffraction and hardness as a function of sintering time and temperature. Greater than 95% density was achieved in the compacts after sintering for 2 h at 450 °C at which time the average grain size was still less than 20 nm. Hardness was measured as a function of grain size, and normal Hall-Petch behavior was observed, but only at grain sizes above approximately 30 nm, at which point a hardness of 12 GPa was measured. At finer particle sizes the hardness decreased with decreasing grain size.
AB - This paper presents recent results on the production and properties of compacts of ultrafine powders of γ-TiAl. Metallic vapor was produced by magnetron sputtering of a TiAl target and inert gas-mediated condensation of nanometer sized particles. After collection, the particles were compacted in situ under ultrahigh vacuum conditions. The material was characterized by X-ray diffraction and hardness as a function of sintering time and temperature. Greater than 95% density was achieved in the compacts after sintering for 2 h at 450 °C at which time the average grain size was still less than 20 nm. Hardness was measured as a function of grain size, and normal Hall-Petch behavior was observed, but only at grain sizes above approximately 30 nm, at which point a hardness of 12 GPa was measured. At finer particle sizes the hardness decreased with decreasing grain size.
UR - http://www.scopus.com/inward/record.url?scp=50749135376&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=50749135376&partnerID=8YFLogxK
U2 - 10.1016/0921-5093(92)90269-7
DO - 10.1016/0921-5093(92)90269-7
M3 - Article
AN - SCOPUS:50749135376
SN - 0921-5093
VL - 153
SP - 676
EP - 678
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
IS - 1-2
ER -