Local structure of NiAl compounds investigated by extended X-ray absorption fine-structure spectroscopy

被引：0

作者：

Tian, J. S. ^{[1
,2
]}

Han, G. M. ^{[1
]}

Wei, H. ^{[1
]}

Jin, T. ^{[1
]}

Dargusch, M. S. ^{[3
]}

机构：

[1] Chinese Acad Sci, Superalloys Div, Inst Met Res, Shenyang 110016, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

[3] Univ Queensland, CAST, CRC, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2012年 / 19卷

基金：

中国国家自然科学基金;

关键词：

NiAl compounds; EXAFS; local structure; site preference; alpha-Cr precipitation; NICKEL-ALUMINUM SYSTEM; SITE PREFERENCE; MECHANICAL-PROPERTIES; INTERMETALLIC ALLOYS; TERNARY ADDITIONS; FE; CO; OCCUPANCIES; ELEMENTS; TENSILE;

D O I：

10.1107/S0909049512015646

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The local structures of pure NiAl and Ti-, Co-doped NiAl compounds have been obtained utilizing extended X-ray absorption fine-structure (EXAFS) spectroscopy. The results provide experimental evidence that Ni antisite defects exist in the Ni-rich NiAl compounds. The site preference of Ti and Co has been confirmed. Ti occupies the Al sublattice, while Co occupies the Ni sublattice. The structure parameters obtained by EXAFS were consistent with the X-ray diffraction results. Owing to the precipitation of alpha-Cr, the local structure of NiAl-Cr has not been obtained, making the site preference of Cr unclear.

引用

页码：503 / 507

页数：5

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