Open AccessAnnealed crystallization of ultrafine amorphous NiB alloy studied by XAFS
Author(s) -
Wei Shiqiang,
Li Zhongrui,
Yin Shilong,
Zhang Xinyi,
Liu Wenhan,
Wang Xiaoguang
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500018070
Subject(s) - materials science , devitrification , crystallization , amorphous solid , alloy , nanocrystalline material , x ray absorption fine structure , amorphous metal , annealing (glass) , metallurgy , chemical engineering , phase (matter) , crystallography , nanotechnology , chemistry , spectroscopy , organic chemistry , physics , quantum mechanics , engineering
XAFS has been used to investigate the local structure evolutions of ultrafine amorphous NiB alloy during the annealed crystal‐lization process. A nanocrystalline Ni phase with the local structure of crystalline Ni‐like and a crystalline Ni 3 B, have been produced for ultrafine amorphous NiB alloy under the annealed temperature of 573 K. The results rule out Rojo et al. 's devitrification mechanism of Ni 80 B 20 amorphous alloy in which they considered that an amorphous pure Ni phase is formed in the first exothermic process. However, our results are almost identical with Riveiro et al. 's conclusion in which the intermediate state is interpreted as two metastable crystalline phases of Ni 3 B and Ni‐rich NiB alloy. With the annealed temperature going onto 773 K, the ultrafine NiB sample is further decomposed and crystallized into crystalline Ni with long‐range order.