TY - JOUR
T1 - Phase equilibria and microstructural control in the Ni-Co-Al system
AU - Kainuma, R.
AU - Ise, M.
AU - Jia, C. C.
AU - Ohtani, H.
AU - Ishida, K.
N1 - Funding Information:
The authors H. Okaniwa for their out these by the the Ministry of Education, Japan . The authors would like to thank the Arai Foundation of Research for their support.
PY - 1996
Y1 - 1996
N2 - This paper is a report of the results of investigations on the phase equilibria among γ (Al), and γ′ (L12) and β(B2) phases, β → β′ (L10) martensitic transformation temperatures, and microstructural features of multi-phase alloys fabricated through various thermo-mechanical processes in the Ni-Co-Al system. The isothermal section diagrams and tie line configurations of 900, 1100 and 1300°C was determined by energy dispersion X-ray spectrometry (EDX) analysis. The Ms temperature was measured by differential scanning calorimetry (DSC) analysis and a contour of iso-Ms composition lines was determined. On the basis of this information, the various types of microstructure of β + γ, β + γ′ and β + γ + γ′ phases was obtained through thermo-mechanical treatment. Morphological features of the multi-phase alloys with fine blocky, plate, Widmanstätten and lamellar structures was discussed in connection with heat-treatment, phase diagram and martensitic transformation. Mechanical properties were also examined and a good combination of strength and ductility was obtained in the multi-phase alloys.
AB - This paper is a report of the results of investigations on the phase equilibria among γ (Al), and γ′ (L12) and β(B2) phases, β → β′ (L10) martensitic transformation temperatures, and microstructural features of multi-phase alloys fabricated through various thermo-mechanical processes in the Ni-Co-Al system. The isothermal section diagrams and tie line configurations of 900, 1100 and 1300°C was determined by energy dispersion X-ray spectrometry (EDX) analysis. The Ms temperature was measured by differential scanning calorimetry (DSC) analysis and a contour of iso-Ms composition lines was determined. On the basis of this information, the various types of microstructure of β + γ, β + γ′ and β + γ + γ′ phases was obtained through thermo-mechanical treatment. Morphological features of the multi-phase alloys with fine blocky, plate, Widmanstätten and lamellar structures was discussed in connection with heat-treatment, phase diagram and martensitic transformation. Mechanical properties were also examined and a good combination of strength and ductility was obtained in the multi-phase alloys.
KW - B. martensitic transformations
KW - C. thermomechanical treatment
KW - D. microstructure
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U2 - 10.1016/0966-9795(96)00034-9
DO - 10.1016/0966-9795(96)00034-9
M3 - Article
AN - SCOPUS:0000960517
SN - 0966-9795
VL - 4
SP - S151-S158
JO - Intermetallics
JF - Intermetallics
IS - SUPPL. 1
ER -