Example 7

A composition including iron foil, 2 wt. % Boron, 3 wt. % copper, and 25 wt % urea was annealed by heating at 700° C. for 0.5 hours and about 10 hours, followed by quenching at room temperature in cold water. The composition was then annealed in a urea environment at 160° C., followed by a second quenching to promote phase transformation from Fe3-4N to Fe8N. Finally, the composition was stress annealed at 160° C. for periodic intervals of 5 hours.

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