Abstract
The as-quenched omega zones in Ti-20%Mo alloy, showed incommensurate X-ray diffuse scattering (XDS). Dark field images obtained with a high resolution electron microscope (HREM) showed that the omega zone was a chain-like array of 3 ~ 5 white dots, and each dot (~6 nm in size) was considered to be a 3 atom molecule estimated from the results of EXAFS. The omega zones were observed as weak modulated fringes on lattice images micrographs. The variants ( ω 1 and ω 3, 5 ~ 10 nm in size) of isothermal commensurate omega phase formed after an incubation period showed the lattice fringe spacings of 0.28 and 0.40 nm corresponding to (222) 3 and ( 1 ̄ 1 ̄ 2) 3 points, respectively. During the incubation period, we observed some morphologically unidentified products (5 ~ 20 nm in size), which were discerned as the precursors of omega variants ( ω 2 and ω 4).
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