Paper Title:
Metastable Two-Phase Field(A2+B2) in Co-Al-Fe and Co-Al Alloy Systems
  Abstract

Precipitation of disordered bcc Co (A2) particles has been investigated in Co-rich B2 ordered Co-Al-Fe and Co-Al alloys by means of a macroscopic composition gradient method using a transmission electron microscope. When Co-Al-Fe ternary and Co-Al binary alloys were annealed at 823-1023K for a relatively short time, bcc disordered particles precipitated within B2 ordered matrix, followed by the formation of equilibrium fcc α-Co (A1) on the phase boundaries. The precipitation limit of metastable A2 phase was evaluated using the binary and ternary specimens with macroscopic compositional gradient. As a result, it was found that the limits are located within the equilibrium A1+B2 two-phase fields in both ternary and binary alloy systems, and that the limit curve on the isothermal section at 923K for Co-Al-Fe system successfully connects with the phase boundary of A2+B2 two-phase field at the Co-Fe binary side of the ternary system.

  Info
Periodical
Materials Science Forum (Volumes 449-452)
Edited by
S.-G. Kang and T. Kobayashi
Pages
61-64
DOI
10.4028/www.scientific.net/MSF.449-452.61
Citation
T. Kozakai, T. Shikama, T. Koyama, M. Doi, "Metastable Two-Phase Field(A2+B2) in Co-Al-Fe and Co-Al Alloy Systems", Materials Science Forum, Vols. 449-452, pp. 61-64, 2004
Online since
March 2004
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Price
$32.00
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