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  1. ; ; (, Scripta Materialia)
    Direct evidence is provided for the existence of the tetragonal L1’ phase, first predicted by Shockley in 1938, in bulk Fe - 62 at% Pd alloys aged at 525 deg C. L1’ existence as the dominant phase is supported by quantitative x-ray diffraction analysis. This is combined with transmission electron microscopy of the polytwinned microstructure, examining the diffracted intensities in specific superlattice reflections where the complete extinction in L10 is relaxed in L1’. Ordering to L1’ appears to occur directly from the A1 parent phase at 525 deg C, while aging at 650 deg C only produces L10. The possibility of L1’ ordering may have consequences for the ferromagnetic properties of classic and important binary alloy systems where L10 is the assumed equilibrium phase. 
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