摘要
用中子衍射分析法研究了Cr,Mo,Ti,Ni,Mn,Si等代位合金元素在当量成分,DO_3结构Fe_3Al金属间化合物亚点阵中的原子占位及其对单胞中Fe原子磁矩,DO_3→B2转变行为的影响.结果表明,Cr,Mo和Ti都占据Al原子的次近邻位置,替代Fe原子;Ni和Mn占据Al原子的最近邻位置;(Si+Al)当量成分以内的Si原子替代占据Al原子的位置.合金元素的加入,不同程度地降低了DO_3结构Fe_3Al合金的有序度。
The site occupation of substitutional elements Cr, Mo, Ti, Ni, Mn, Si at sublattices in DO3 type stoichiometric Fe3Al intermetallics, and effects of the elements on magnetic momentum of unit cell and DO3→B2 transformation behaviour have been determined by means of neutron diffractometry. The experimental results indicate that Cr, Mo and Ti atoms all occupy the next nearest neighbour of Al atom, Ni and Mn atoms the nearest neighbour, while Si atoms occupy the positions of AI atoms. All the alloying elements investigated in the present work decrease order degree of DO3-type Fe3Al alloy, and modify the magnetic momentums of two type Fe atoms in the unit cell.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第8期799-804,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金及中国核工业总公司资助项目
关键词
中子衍射
原子占位
金属间化合物
Fe_3Al,neutron diffraction, site occupation, DO_3→B2 transformation, magnetic momentum