X-ray diffraction analysis by Rietveld refinement of FeAl alloys doped with terbium and its correlation with magnetostriction  

作　　者：J.S.Uribe-Chavira G.Herrera-Pérez C.R.Santillán-Rodríguez R.J.Sáenz-Hernández J.A.Matutes-Aquino M.C.Grijalva-Castillo 

机构地区：[1]Materials Physics Department,Centro de Investigación en Materiales Avanzados,S.C.,Miguel de Cervantes 120,Chihuahua,31136,Chih,Mexico [2]CONACYT–Centro de Investigación en Materiales Avanzados,S.C.,Miguel de Cervantes 120,Chihuahua,31136,Chih,Mexico

出　　处：《Journal of Rare Earths》2023年第8期1217-1224,I0004,共9页稀土学报（英文版）

基　　金：Cátedra Grant No.2563 of CONACyT Mexico。

摘　　要：Fe_(81)Al_(19) polycrystalline alloys doped with Tb(0-0.25 at%) were obtained by arc melting.The introduction of Tb favors the formation of columnar grains in the micro structure of the alloys,which develops a texture in the [100]crystal direction.Microstructural examination shows that the alloys are composed in great proportion by the disordered body-centered cubic(bcc),A2 phase and by a small proportion of the ordered bcc,B2 phase.As a consequence of doping with Tb,the lattice parameter increases,so the calculated apparent crystallite size increases,indicating a decrease in dislocation density and therefore in microstrains.The change in the magnetostriction with the magnetic field,dλ_(T)/dH,is directly related to strain anisotropy that can favor the iron easy magnetization axis on the [100] direction.An increase in total magnetostriction is found in the doped alloys with a maximum of 90 × 10^(-6) at 300 K for the alloy containing 0.027 at% Tb.This enhancement is a threefold value of the undoped alloy,which is attributed to the smaller maximum strain value and the preferential orientation formation by the columnar grains.

关 键 词：FeAl alloy MAGNETOSTRICTION Rietveld refinement Microstrains Preferred orientation Rare earths 

分 类 号：TM27[一般工业技术—材料科学与工程]