Partition behavior of alloying elements and phase transformation temperatures in Co–Al–W-base quaternary systems |
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| Affiliation: | 1. Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan;2. Metallurgy Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;1. Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Materials Science & Engineering, Institute I, Martensstr. 5, 91058 Erlangen, Germany;2. Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Rd, Cambridge CB3 0FS, UK;1. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, 21502 Geesthacht, Germany;2. Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science and Engineering, Institute I, Institute of General Materials Properties, Universität Erlangen-Nürnberg, Martensstrasse 5, 91058 Erlangen, Germany;3. Institute of Materials Technology, Helmut-Schmidt-Universität, Holstenhofweg 85, 22043 Hamburg, Germany;1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China;2. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, People’s Republic of China |
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| Abstract: | The phase equilibria among γ (A1), γ′ (L12), χ (D019), β (B2) and μ (D85) phases and the γ′ solvus and γ solidus temperatures were investigated in the Co–Al–W-based quaternary systems with alloying elements of Ti, V, Nb, Ta, Cr, Mo, Mn, Fe, Ni, Si, Zr, Hf, Ru and Ir by electron probe microanalysis (EPMA) using multiphase alloys and by differential scanning calorimetry (DSC). It was found that Ta, Nb, Ti, V, Mo and W are partitioned to the γ′ or χ phase rather than to the γ phase, while Cr, Mn and Fe tend to be distributed to the γ phase. The correlation between the partition coefficient of alloying elements between γ/γ′, γ/χ and γ/β phases and ab initio formation energy of Co3X (L12), Co3X (D019) and CoX (B2) was respectively obtained. It was also found that the γ′ solvus temperature increases by the addition of the γ′ former elements such as Ta, Nb and Ti, which decreases the γ solidus temperature. |
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