Masato Sagawa1, Masanori Okada1 and Zenzo Henmi1
1Fujitsu Laboratories, Ltd., Kawasaki
The relationship between the coercive force and the precipitation sequence in a Co-12Fe-3Nb alloy which was cold-rolled by a 10% reduction in area and then annealed at 700 and 800°C for 1 ∼ 100 hr was investigated through measurements of hysteresis loop and electron microscopic observations.
The results obtained are summarized as follows:
(1) The precipitate phase in the fully heat-treated alloy is a hexagonal Laves phase Co3Nb in the form of platelets.
(2) This platelet interface is parallel to the (111) planes of the fcc matrix and the orientation relationship between the matrix and the precipitate of Co3Nb may be described as
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