Thermal stability and magnetocaloric effect of the Gd65Fe20Al15−xBx (x=0–7) glassy ribbons
作者： Y. K. Fang , C. H. Lai , C. C. Hsieh , X. G. Zhao , H. W. Chang
DOI: 10.1063/1.3335498
关键词: Magnetic refrigeration 、 Metallurgy 、 Analytical chemistry 、 Glass structure 、 Amorphous metal 、 Iron alloys 、 Supercooling 、 Thermal stability 、 Glass forming 、 Glass transition 、 Materials science
摘要: The thermal stability, magnetocaloric effect, and refrigeration capacity (RC) of Gd-based Gd(65)Fe(20)Al(15-x)B(x) (x=0-7) glassy ribbons have been investigated. A relatively wide supercooled liquid region Delta T(x)(Delta T(x)=T(x)-T(g)) (50-80 K) large reduced glass transition temperature T(rg)(T(rg)=T(g)/T(m)) (>0.63) are found in ribbons. distinctive sharp crystalline events as well values T(x) T(rg) confirm the excellent forming ability these alloys. maximal magnetic entropy changes, -Delta S(M)(max), RC specimens about 4.80-5.21 J/kg K 700-800 under 50 kOe, respectively. These S(M)(max) comparable to or even higher than that some reported bulk metallic glasses. Moreover, larger due broad S(M) peak (similar 200 K), which is caused by structure. make attractive candidates for materials. (C) 2010 American Institute Physics. [doi: 10.1063/1.3335498]
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