Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803609 | Journal of Alloys and Compounds | 2005 | 6 Pages |
Abstract
La(Fe0.88Co0.12)13âxSixalloys were produced by arc-melting and melt spinning with various wheel speeds. The phase formation and microstructure were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The rapid quenching and the increase in Si content greatly facilitated the formation of the cubic NaZn13-type La(Fe, Co, Si)13 (1:13) in La(Fe0.88Co0.12)13âxSix alloys. Rietveld fitting results indicate that the amount of the 1:13 phase is 61, 82 and 100âwt.% in the rapidly quenched (RQ) alloys with x=1.5, 1.8 and 2.2, respectively. A single phase of 1:13 structure is formed in the rapidly quenched alloy with x=1.5 and 1.8 after a short annealing process (1273âK/20âmin) compared to several weeks for attaining an almost single phase with the 1:13 structure for the arc-melted (AM) alloy. Microstructural analyses (TEM) indicate that the 1:13 phase with submicron grain size is the matrix phase while α-Fe is nano-size precipitate phase within the matrix in the rapidly quenched La(Fe0.88Co0.12)11.5Si1.5 alloy prepared with a wheel speed of 40âm/s. The fine microstructure of the rapidly quenched alloy is responsible for the rapid formation of the 1:13 phase during the annealing process.
Keywords
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Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
X.B. Liu, X.D. Liu, Z. Altounian, G.H. Tu,