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

机译:COTi和Cr添加对磁热静脉岩Gd-Ge-Si合金微观结构磁性和耐腐蚀的影响

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摘要

The paper presents studies of microstructure, magnetic and corrosion properties of the Gd58Ge20Si22, Gd56Ge20Si22Co2, Gd56Ge20Si22Ti2 and Gd56Ge20Si22Cr2 (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 Gd5Ge2Si2-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 M(T) characteristics, it was found that the lowest Curie point (TC = 268 K) was estimated for the Gd58Ge20Si22 sample, whereas the highest value of the Curie temperature (TC = 308 K) was for the Gd56Ge20Si22Cr2 alloys. Moreover, the GdGeSi alloy without alloying additions shows the highest magnetic entropy change |ΔSM| = 15.07 J⋅kg−1⋅K−1 for the maximum magnetic field of 2 T. The maximum |ΔSM| measured for the Gd56Ge20Si22 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−1⋅K−1, 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.
机译:本文介绍了在1450k的等温热处理后,Gd58Ge20Si22,Gd56Ge20Si22,Gd56ge20Si22,Gd56ge20Si22Ti2和Gd56Ge20Si2222Cr2和Gd56ge20Si222Cr2(at。%)合金的研究。由X射线衍射进行的所生产的材料的结构研究显示所有研究中的GD5Ge2SI2型相的存在。 DC和AC磁测量证实居里温度取决于所生产的合金的化学成分。从M(t)特性,发现Gd58Ge20Si22样品估计最低居里点(Tc = 268k),而居里温度(Tc = 308k)的最高值是Gd56Ge20Si222Cr2合金。此外,没有合金化添加的Gdgesi合金表示最高磁熵变化|ΔSm| = 15.07j⋅kg-1⋅k-1,用于2t的最大磁场。最大|Δsm|在居里点附近获得具有用于相同磁场的CO,Ti或Cr的Gd56Ge20Si22,分别等于2.92,2.73和2.95J⋅kg-1⋅k-1。在3%NaCl溶液中曝光60分钟和55天的电化学研究表明,稳定性最高和耐腐蚀性呈添加,添加了Ti的添加。

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