METALS AND METAL MATRIX COMPOSITES |
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Study on the Microstructure and Properties of Pt-Co-Mn Alloy |
LUO Yuan, WANG Xian, ZHAO Jun, HU Changyi, ZHANG Dawei, WEI Yan*, ZHANG Xuxiang, CAI Hongzhong*
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State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, China |
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Abstract Four kinds of Pt-Co-Mn alloys were prepared by vacuum arc smelting. The microstructure, mechanical properties, magnetism, reflectivity and corrosion resistance of Pt-Co-Mn alloys were studied by X-ray diffractometer (XRD), metallographic microscope, microhardness tester, magnetism measuring instrument, spectrophotometer and electrochemical workstation. The results showed that the Pt-Co-Mn alloys were single phase solid solution with an average grain size of 200—300 μm. Co and Mn in solid solution were found to give a considerably higher strengthening effect than Co. The Vickers hardness of Pt-Co-Mn alloys varied from 162HV to 179HV, which was higher than that of Pt-5Co alloy. The magnetism of Pt-Co-Mn alloys could be eliminated by adding Mn to Pt-Co alloy at room temperature. In addition, Pt-2.0Co-2.0Mn alloy exhibited the lowest average susceptibility value of 1.45×10-5 and the smoothest hysteresis loop, which showed the best degaussing effect. The average reflectance of Pt-Co-Mn alloy in the visible spectrum ranged from 54.5% to 57.8%, which indicated that the proportion of Co and Mn elements had little influence on the reflectance of the alloy. The proportion of Co and Mn had little influence on the reflectance of the alloy. The analyzed alloys exhibited a good corrosion resistance in artificial sweat. Furthermore, Pt-2.6Co-1.4Mn alloy had higher corrosion potential value of -0.032 V and lower corrosion current density value of 2.01 μA/cm2. The obtained corrosion potential and corrosion current density led to the best corrosion resistance of Pt-2.6Co-1.4Mn alloy.
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Published: 25 May 2023
Online: 2023-05-23
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Fund:Key Projects of Basic Research Plan of Yunnan Province (2019FA048), and the Materials Genetic Engineering Project of Yunnan Province (2019ZE001,202002AB080001-1-4). |
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