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Evolution of crystallographic texture in thin wires (1992)

Montesin, T. ; Heizmann, J. J.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 25 (1992), S. 665-673

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ISSN: 1600-5767

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Geosciences , Physics

Notes: An X-ray diffraction procedure has been developed to measure accurately the textures of thin wires so that the texture variation across the wire radius may be obtained. Since X-rays penetrate no further than the surface of most metals, X-ray examination can be considered to be superficial for large wires but by thinning the wire it is possible to obtain the texture variation across its radius. When the diameter is very small, X-rays can penetrate a significant proportion of the wire. In these cases a new technique using the texture changes between several thinning procedures allows a precise understanding of the texture variation between the surface and the core of the wire. To illustrate the application of this procedure, some examples are given for 175 μm steel cord.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0021889892004849

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Structural and morphological studies of the growth of MoO3 scales during high-temperature oxidation of molybdenum (1992)

Floquet, N. ; Bertrand, O. ; Heizmann, J. J.

Springer

Oxidation of metals 37 (1992), S. 253-280

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ISSN: 1573-4889

Keywords: molybdenum ; molybdenum trioxide ; oxidation ; oriented growth ; growth mechanism

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The oxidation of polycrystalline Mo plates and of Mo(100), Mo(110), and Mo(111) single-crystal plates in pure oxygen at 8 × 104 and 2.7 × 103 Pa, at 743–1023 K leads to the growth of orthorhombic MoO3 only, as shown by X-ray diffraction and SEM observations. The stable oxides MoO2 and Mo4O11 were not identified. At each side of the molybdenum plate, the oxide scale is a stacking of MoO3 crystals with their [100] axes oriented normal to the surface of the initial Mo plate. The MoO3 crystals are very thick in the [010] direction, compared with the well-known shape of the MoO3 crystals grown from the vapor phase. Two main factors determine the oriented growth of MoO3 crystals from Mo oxidation. A growth mechanism involving a structural rearrangement of the Mo atoms at the reactional interface and oxygen diffusion through the oxide is proposed.