A new face-centered-cubic superlattice structure in rapidly solidified Cu-4 Wt Pct Ti alloy and its relevance to the ord
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Fig. 8— -phase modulated structure, after 10 h at 700 ⬚C (AFM).
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Ordering processes in alloys showing short-range order (SRO) intensity maxima at {1 1/2 0} and equivalent positions in the fcc reciprocal space exhibit several intriguing characteristics and therefore have been the subject of numerous theoretical and experimental investigations. The binary NiMo[1–8] and some of its ternary derivatives[9,10] are classic examples of such alloys. In alloys with composition close to Ni80Mo20, for instance, ordering initiates by the appearance of SRO intensity maxima at {1 1/2 0}fcc and equivalent positions (Figure 1(a)) in selected area diffraction patterns (SADPs). On aging, there is initially an increase in the intensity of the SRO maxima.[7,8] This is followed by a continuous transformation to the equilibrium long-range ordered (LRO) Ni4Mo (strukturbericht symbol D1a) phase. Wing-shaped streaks of intensity extending from the SRO maxima to the superlattice posi
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