Experimental determination of phase equilibria in the Y–Co–Ti system through diffusion couples and equilibrium alloys |
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| Affiliation: | 1. School of Materials Science and Engineering & Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, China;2. Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, Guilin University of Electronic Technology, Guilin, 541004, China;3. School of Materials Science and Engineering, Central South University, Changsha, 410083, China;1. Department of Chemical Engineering, National Tsing Hua University, Taiwan;2. High Entropy Materials Center, National Tsing Hua University, Taiwan;1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA;2. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;1. SRC Thermochemistry of Materials, NUST MISIS, Leninsky prosp. 4, 119049, Moscow, Russia;2. Department of Chemistry, Lomonosov Moscow State University, 1-3 LeninskiyeGory, 119991, Moscow, Russia;3. Hampton Thermodynamics Ltd, Hampton Hill, Hampton, UK;1. GERDAU COSIGUA, Santa Cruz, Brazil;2. EEIMVR-UFF, Volta Redonda, Brazil;1. School of Metallurgy, Northeastern University, Shenyang, 110819, China;2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China |
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| Abstract: | Two isothermal sections of the Y–Co–Ti system at 600 °C and 800 °C were constructed for the first time using the diffusion couple technique and the equilibrium alloy method in combination with scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), electron probe microanalysis (EPMA), and X-ray diffraction (XRD). The stable ternary intermetallic compound YCo12-xTix was detected and was confirmed to have a ThMn12-type structure. The composition range in this ternary compound was measured to be 8.3–18.2 at.% at 600 °C and 8.9–19.1 at.% at 800 °C, resulting in the stable formation of YCo12-xTix with x = 1.1–2.4 at 600 °C and x = 1.2–2.5 at 800 °C. The experimental results measured by EDS and EPMA demonstrate that the maximum solubilities of Ti in YCo2, YCo3, Y2Co7 and Y2Co17 compounds at 600 °C are 3.3, 5.6, 5.7 and 6.6 at.%, respectively, while the maximum solubilities of Y in Co3Ti, Co2Ti(h), Co2Ti(c) and CoTi compounds are 2.7, 2.1, 2.6, 3.8 and 1.1 at.%. Meanwhile, the maximum solubilities of Ti in YCo3, Y2Co7, YCo5 and Y2Co17 compounds at 800 °C were determined to be 5.4, 3.2, 2.5 and 5.4 at.%, respectively, while the maximum solubilities of Y in Co2Ti(c), Co2Ti(h) and Co3Ti compounds were measured to be 2.5, 2.1 and 3.8 at.%. The phase equilibria of the Y–Co–Ti system obtained in this work would provide the experimental information for phase stability of YCo12-xTix compound and then explore the design of Y–Co–Ti based magnetic alloys with good magnetic properties. |
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| Keywords: | Y-Co-Ti Intermetallic compounds Phase equilibria |
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