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Titolo:
Structural relaxation of residual amorphous matrix and modulus oscillationin nanocrystalline FeSiNbCuB ribbons
Autore:
Shek, CH; Hu, XD; Lin, GM; Lin, J;
Indirizzi:
City Univ Hong Kong, Dept Phys & Mat Sci, Hong Kong, Hong Kong, Peoples R China City Univ Hong Kong Hong Kong Hong Kong Peoples R China Peoples R China Zhongshan Univ, Dept Phys, Guangzhou 510275, Peoples R China Zhongshan Univ Guangzhou Peoples R China 510275 510275, Peoples R China
Titolo Testata:
NANOSTRUCTURED MATERIALS
fascicolo: 8, volume: 11, anno: 1999,
pagine: 1133 - 1140
SICI:
0965-9773(199911)11:8<1133:SRORAM>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRAFINE GRAIN-STRUCTURE; POSITRON-LIFETIME; ALLOYS; CRYSTALLIZATION; SPECTRA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Shek, CH City Univ Hong Kong, Dept Phys & Mat Sci, Tat Chee Ave, Hong Kong, Hong Kong, Peoples R China City Univ Hong Kong Tat Chee Ave Hong Kong Hong Kong Peoples R China
Citazione:
C.H. Shek et al., "Structural relaxation of residual amorphous matrix and modulus oscillationin nanocrystalline FeSiNbCuB ribbons", NANOSTR MAT, 11(8), 1999, pp. 1133-1140

Abstract

Amorphous Fe73.5Cu1Nb3Si13.5B9 ribbons prepared by melt-spinning were annealed at 500 degrees C for different periods. The dependence on annealing time (t) of the average grain size (d) and volume fraction (V-c) of alpha-Fe(Si) phase, as well as the Young's modulus (E) of the ribbons were investigated by X-ray diffraction (XRD) and tensile test, respectively. The grain size of the alpha-Fe(Si) phase grew in stages with annealing time, exhibitingplateaus between rapid growth periods. The Young's modulus oscillated withannealing time and the peaks in the E-t curve appeared at the times when grain growth slow down, i.e. the plateau region. The chemical compositions of the amorphous layer surrounding the growing alpha-Fe(Si) phase and that of the amorphous matrix were estimated. The time taken for the composition equilibration between the amorphous shell ahead of the crystallization frontand the amorphous matrix was calculated with Fick's diffusion equation. The calculated time had the same order of magnitude as that of the period of the staged-growth of the alpha-Fe(Si) phase. This staged-growth process, controlled by the diffusion of niobium, and the periodical structural relaxation of the amorphous matrix give rise to the oscillating behavior of the E vs, t relationship. (C) 2000 Acta Metallurgica Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 09:05:32