The Magnetic Property Re-based Bulk Metallic Glasses

This work focused on analysis and studying of the Pr-based bulk metallic glasses(BMGs) under different annealing temperatures and different annealing time.The magneticincluded the saturation magnetization (Ms), the intrinsic coercivity (Hc), the Curietemperature (Tc) and so on. The microstructure of crystallization phase was investigatedby optical microscope and scanning electron microscopy (SEM).The magnetic property of the Pr-based BMGs was paramagnetic, Pr₆₀Cu₁₇Al₁₅Ni₈showed superparamagnetic, especially. The Ms of the Pr₆₀Cu₁₇Al₁₅Ni₈,Pr₅₅Cu_13.3Al₂₅Ni_6.7,Pr₅₅Cu₁₇Al₂₀Ni₈BMG was32.24emu/g,27.30emu/g,30.97emu/g,respectively, the highest Tc (K) was15.5K,18.0K,21.5K, respectively. Theparamagnetic property of the Pr-based BMGs was improved by the glass transitiontemperature annealing, the annealed temperature was373K. Pr₆₀Cu₁₇Al₁₅Ni₈still showedsuperparamagnetic, especially. Under the glass transition temperature, the Ms and thehighest Tc (K) of the Pr₆₀Cu₁₇Al₁₅Ni₈,Pr₅₅Cu_13.3Al₂₅Ni_6.7,Pr₅₅Cu₁₇Al₂₀Ni₈BMG washigher than the untreated sample. Under the supercooled liquid region annealing, thesample was crystallized. The annealed temperature of Pr60Cu17Al15Ni8alloy was467K,The annealed temperature of Pr₅₅Cu_13.3Al₂₅Ni_6.7alloy was501K, The annealedtemperature of Pr₅₅Cu₁₇Al₂₀Ni₈alloy was494K. It can be seen that the crystalline shapesof Pr₆₀Cu₁₇Al₁₅Ni₈was "maple leaf type" and "dendritic crystal" for Pr₅₅Cu_13.3Al₂₅Ni_6.7,Pr₅₅Cu17Al₂₀Ni₈. The magnetic property of the Pr-alloy was changed from paramagnetic tohard magnetic. The maximum Ms of Pr₆₀Cu₁₇Al₁₅Ni₈was39.8emu/g,the maximum Hcachieved119.4KA/m. The maximum Ms of Pr₅₅Cu_13.3Al₂5Ni_6.7was29.8emu/g, themaximum Hc achieved270KA/m. The maximum Ms of Pr55Cu17Al20Ni8was33.2emu/g,themaximum Hc achieved206.2KA/m.