添加Co、Ti和Cr对磁热效应Gd-Ge-Si合金的微观结构、磁性能及耐腐蚀性的影响

Effect of Co, Ti and Cr Additions on Microstructure, Magnetic Properties and Corrosion Resistance of Magnetocaloric Gd-Ge-Si Alloys.

作者信息

Hasiak Mariusz, Chęcmanowski Jacek G, Kucharska Barbara, Łaszcz Amadeusz, Kolano-Burian Aleksandra, Kaleta Jerzy

机构信息

Department of Mechanics, Materials and Biomedical Engineering, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, Poland.

Department of Advanced Materials Technologies, Wrocław University of Science and Technology, 25 Smoluchowskiego, 50-370 Wrocław, Poland.

出版信息

Materials (Basel). 2020 Dec 17;13(24):5758. doi: 10.3390/ma13245758.

DOI:10.3390/ma13245758

PMID:33348588

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7767271/

Abstract

The paper presents studies of microstructure, magnetic and corrosion properties of the GdGeSi, GdGeSiCo, GdGeSiTi and GdGeSiCr (at.%) alloys after isothermal heat treatment at 1450 K for 2 h. The structure investigations of the produced materials performed by X-ray diffraction show the presence of GdGeSi-type phase in all investigated samples. DC and AC magnetic measurements confirmed that the Curie temperature depends on the chemical composition of the produced alloys. From () characteristics, it was found that the lowest Curie point ( = 268 K) was estimated for the GdGeSi sample, whereas the highest value of the Curie temperature ( = 308 K) was for the GdGeSiCr alloys. Moreover, the GdGeSi alloy without alloying additions shows the highest magnetic entropy change |ΔS| = 15.07 J⋅kg⋅K for the maximum magnetic field of 2 T. The maximum |ΔS| measured for the GdGeSi with the addition of Co, Ti or Cr for the same magnetic field was obtained in the vicinity of the Curie point and equals to 2.92, 2.73 and 2.95 J⋅kg⋅K, respectively. Electrochemical studies of the produced materials for 60 min and 55 days exposure in 3% NaCl solution show that the highest stability and corrosion resistance were exhibited the sample with added of Ti.

摘要

本文介绍了GdGeSi、GdGeSiCo、GdGeSiTi和GdGeSiCr（原子百分比）合金在1450 K等温热处理2小时后的微观结构、磁性和腐蚀性能研究。通过X射线衍射对所制备材料进行的结构研究表明，所有研究样品中均存在GdGeSi型相。直流和交流磁性测量证实居里温度取决于所制备合金的化学成分。从（）特性发现，GdGeSi样品的居里点最低（= 268 K），而GdGeSiCr合金的居里温度最高值（= 308 K）。此外，未添加合金元素的GdGeSi合金在2 T最大磁场下显示出最高的磁熵变|ΔS| = 15.07 J⋅kg⋅K。在相同磁场下，添加Co、Ti或Cr的GdGeSi合金测得的最大|ΔS|在居里点附近获得，分别等于2.92、2.73和2.95 J⋅kg⋅K。对所制备材料在3% NaCl溶液中暴露60分钟和55天的电化学研究表明，添加Ti的样品表现出最高的稳定性和耐腐蚀性。