TY - JOUR
T1 - Phase stability of the L12 compound and microstructural changes in Co-(W or Mo)-Ta ternary alloys
AU - Chinen, Hibiki
AU - Omori, Toshihiro
AU - Oikawa, Katsunari
AU - Ohnuma, Ikuo
AU - Kainuma, Ryosuke
AU - Ishida, Kiyohito
PY - 2009
Y1 - 2009
N2 - Microstructural investigations of Co-5W-2.5Ta (at.%) and Co-4Mo-4.5Ta (at.%) ternary alloys were conducted. Fine coherent precipitates were observed in these alloys annealed at 800°C, and the crystal structures of precipitates (γ') and matrix (γ) phase were identified as the L12 and A1 structure, respectively, by transmission electron microscopy. Cellular precipitation with a γ+κ(D019) lamellar structure also proceeded at grain boundaries, and the alloys aged for a longer time only showed the γ+κ two-phase microstructure instead of the γ' phase. With aging at around 800°C, the peak hardness of these alloys with a γ+γ' two phase structure was about 580 Hv.
AB - Microstructural investigations of Co-5W-2.5Ta (at.%) and Co-4Mo-4.5Ta (at.%) ternary alloys were conducted. Fine coherent precipitates were observed in these alloys annealed at 800°C, and the crystal structures of precipitates (γ') and matrix (γ) phase were identified as the L12 and A1 structure, respectively, by transmission electron microscopy. Cellular precipitation with a γ+κ(D019) lamellar structure also proceeded at grain boundaries, and the alloys aged for a longer time only showed the γ+κ two-phase microstructure instead of the γ' phase. With aging at around 800°C, the peak hardness of these alloys with a γ+γ' two phase structure was about 580 Hv.
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M3 - Conference article
AN - SCOPUS:70449346274
SN - 0272-9172
VL - 1128
SP - 375
EP - 379
JO - Materials Research Society Symposium Proceedings
JF - Materials Research Society Symposium Proceedings
T2 - 2008 MRS Fall Meeting
Y2 - 2 December 2008 through 4 December 2008
ER -