摘要
利用扩展x射线吸收精细结构和x射线衍射研究了机械合金化制备的体心立方(bcc)的亚稳态Fe80Cu20合金固溶体的结构随退火温度的变化特点.结果表明,在300—873K温度范围内,随着退火温度的升高,bcc结构物相的晶格常数近于线性降低,这主要是由于Cu原子从bcc结构Fe80Cu20合金固溶体中逐渐偏析出来,生成面心立方(fcc)结构的Cu物相所致.经603K退火后,Cu原子的平均键长RCu—Cu增加了0.003nm左右,大约有50%的Cu原子从bcc结构的Fe80Cu20合金固溶体中偏析出来.在773K退火后,bcc结构Fe80Cu20合金固溶体近于完全相分离,生成了bcc结构的α-Fe与fcc结构的Cu物相.
The extended x-ray absorption fine structure （EXAFS） and x-ray diffraction （XRD） techniques have been used to study the dependence of structural changes on annealing temperature for metastable body centered cubic （bee） Fe80Cu20 alloy synthesized by mechanical alloying. In the temperature range from 300 to 873 K, the lattice constant of the bcc-structured phase exhibits a nearly linear decrease with the increase of annealing temperature. This is mainly due to the segregation of Cu atoms from the bcc FesoCu20 alloy to form the face centered cubic （fcc） Cu phase. Annealing at 603 K results in an increase of the average Cu-Cu distance RCu-Cu by about 0.003 nm, and about 50% Cu atoms are segregated from the bcc Fe80Cu20 alloy. After annealing at 773 K, two phases of bcc α-Fe and fcc-Cu are almost completely separated from the as-milled bcc Fe80Cu20 alloy.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第12期5707-5712,共6页
Acta Physica Sinica
基金
国家自然科学基金(批准号:10275061
10274077)
中国科学院王宽诚博士后工作奖励基金(批准号:200448)资助的课题.~~
