Effect of Co substitution on the glass forming ability and magnetocaloric effect of Fe88Zr8B4 amorphous alloys

As greater attention is paid to energy consumption and global warming,magnetic refrigeration(MR)technologies based on the magneto-caloric effect(MCE)have been developed.Systems based on MR are expected to be more compact。

具有宽过冷液相区的Fe_(62)Co_(8-x)(Cr,Mo)_xNb_4Zr_6B_(20)非晶态合金的热稳定性与磁性

根据制备块状非晶态合金的三条经验准则 ,选择了成分为Fe6 2 Co8-xCrxNb4 Zr6 B2 0 和Fe6 2 Co8-xMoxNb4 Zr6 B2 0 (x =0 ,2 ,4 )的合金系 .利用单辊急冷法制备出厚为 3 0 μm宽为 5mm左右的条带 ,并用差热分析、X射线衍射以及Faraday磁天平、静态磁性测量仪等研究了合金的热稳定性、非晶结构和磁性能 .发现含 2at%Cr的Fe6 2 Co6 Cr2 Nb4 Zr6 B2 0 非晶态合金的过冷液相区ΔTx 最宽 ,达到 85K ,但是合金系的饱和比磁化强度σs 随Cr或Mo含量的增加而急剧下降 .合金系经 973K真空退火 90 0s后 ,由于晶化相α Fe等晶相析出 ,使得各合金的σs 和Hc 都迅速升高 .