摘要
ThelocalstructuresoftheimmiscibleFe100-xCuxalloys(x=0,10,20,40,60,80and100)producedbymechanicalalloyinghavebeeninvestigatedbyXAFS.FortheFe100-xCux(x≥40)solidsolutions,thelocalstructuresaroundFeatomschangefrombccstructuretofcconeandtheCuatomsmaintaintheoriginalcoordinationgeometryaftermillingfor160hours.Onthecontrary,thelocalstructuresaroundCuatomsinbothofFe80Cu20andFe90Cu10alloysappearatransitionfromfcctobccstructure.WefoundthattheDebye-wallerfactorσoffccFe-CuphaseislargerthanthatofbccF-Cuphase,andtheσ(0.099A°)aroundFeatomsislargerthanthat(0.089A°)ofCuintheFe100-xCux(x≥40)solidsolutions,ThissuggeststhatthemechanicallyalloyedFe100-xCuxsupersaturatedsolidsolutionisnotahomogeneousalloy,andconsistsofFe-richandCu-richregionsforvariouscompositions.Apossiblemechanismforbcc-to-fccandfcc-to-bccchangesinFe100-xCuxsolidsolutionsisdiscussedinrelationtotheinterdiffusionandtransitioninducedbytheballmilling.
出版日期
2001年01月11日(中国期刊网平台首次上网日期,不代表论文的发表时间)