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Structural models of long-period out-of-phase superstructures are discussed on the basis of diffraction physics. The paper analyses the structural factors of one-dimensional out-of-phase superstructures of both constant periods and incommensurate arrangements, showing excellent agreement with experimentally observed diffraction patterns.
The microstructures of as-cast and heat-treated ingots and melt-spun and heat-treated ribbons of Nb-17at%Al-xat%Mo alloys (x = 20, 30, 40) were studied. The results show that Mo inhibits the A2 → B2 ordering transformation of the β phase and destabilises ω formation. A ternary ω * phase has been observed for the first time in the B2 matrix of the melt-spun ribbons after heat-treatment at...
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