STRUCTUREAND PROPERTY OF DIRECTIONALLY SOLIDIFIED EUTECTIC Bi/MnBi ALLOY

Eutectic Bi/MnBi magnetic alloy was prepared by directional solidification.When thegrowth rate,R>2 cm/h,the MnBi fibre spacing,λ,distributed homogeneously inBi matrix,follows λ~2R=constant.The thermal gradient.G_L,does not influenceλ.The magnetic property,B_r of Bi/MnBi alloy decreases with the increase of R andincreases with the increase of G_L.