Abstract
The effect of an applied stress on formation of Fe 16N 2 in a FeN alloy has been examined by use of a magnetic torque meter and a scanning electron microscope. Stress-assisted preferential nucleation of Fe 16N 2 and formation of metastable primary clusters have been detected by measuring magnetic anisotropy. It is found that uniaxial magnetization along the cube axis is not achieved in the early stage of precipitation, particularly during low temperature aging, but is achieved only after full aging at a higher temperature. On the basis of the analyses of magnetic torque curves, the possible structures of the primary clusters are proposed and compared with the microscopic observations of the precipitates.
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