TY - GEN
T1 - Ti-based quasicrystal layers produced by plasma thermal spraying
AU - Takasaki, Akito
AU - Uematsu, Susumu
AU - Kelton, K. F.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2007
Y1 - 2007
N2 - Ti45Zr38Ni17 powders were thermally sprayed onto mild steel substrates in air and under a reduced pressure of argon. Two kinds of powder samples were used in this study. For one type the elemental powders were gently (manually) mixed in a vial, and for the other type they were mechanically alloyed by a planetary ball mill. Several kinds of oxides were formed after thermally-spraying the mechanically-alloyed powders in air. After spraying in a reduced pressure of argon, on the other hand, the coating layers obtained from the gently mixed powders consisted of the three elemental metals (Ti, Zr, Ni), but an amorphous phase primarily appeared in the thermallysprayed mechanically-alloyed powders. This amorphous phase transformed into the icosahedral quasicrystal phase and a minor Ti2Ni-type crystal phase after annealing in vacuum at 828 K. The Vickers hardness and the contact angle with pure water for the quasicrystal layers were about 7 GPa and 92° respectively.
AB - Ti45Zr38Ni17 powders were thermally sprayed onto mild steel substrates in air and under a reduced pressure of argon. Two kinds of powder samples were used in this study. For one type the elemental powders were gently (manually) mixed in a vial, and for the other type they were mechanically alloyed by a planetary ball mill. Several kinds of oxides were formed after thermally-spraying the mechanically-alloyed powders in air. After spraying in a reduced pressure of argon, on the other hand, the coating layers obtained from the gently mixed powders consisted of the three elemental metals (Ti, Zr, Ni), but an amorphous phase primarily appeared in the thermallysprayed mechanically-alloyed powders. This amorphous phase transformed into the icosahedral quasicrystal phase and a minor Ti2Ni-type crystal phase after annealing in vacuum at 828 K. The Vickers hardness and the contact angle with pure water for the quasicrystal layers were about 7 GPa and 92° respectively.
KW - Mechanical alloying
KW - Quasicrystal
KW - Thermal spraying
KW - Ti-Zr-Ni
UR - http://www.scopus.com/inward/record.url?scp=38349127088&partnerID=8YFLogxK
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U2 - 10.4028/0-87849-419-7.449
DO - 10.4028/0-87849-419-7.449
M3 - Conference contribution
AN - SCOPUS:38349127088
SN - 0878494197
SN - 9780878494194
T3 - Materials Science Forum
SP - 449
EP - 452
BT - Progress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006)
PB - Trans Tech Publications Ltd
T2 - 2006 Powder Metallurgy World Congress and Exhibition, PM 2006
Y2 - 24 September 2006 through 28 September 2006
ER -