X Ray Diffraction

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J L Lebrun - One of the best experts on this subject based on the ideXlab platform.

  • surface hardness measurment and microstructural characterisation of steel by X Ray Diffraction profile analysis
    International Journal of Engineering, 1995
    Co-Authors: G H Farrahi, J L Lebrun
    Abstract:

    An X-Ray Diffraction line will broaden considerably when steels change into martensitic structure on quenching. The results presented in this paper show that X-Ray Diffraction technique can be employed for a rapid and nondestructive measurement of hardness of hardened steel. Measurement on various quenched and tempered steels showed that the breadth of its Diffraction peak increased with increasing hardness. Some empirical equations are derived to correlate the width of the Diffraction line with the hardness. The Diffraction profile analysis can offer good indication about the material's characteristics and the microstructural evolution caused by heat treatment or by mechanical loading.

C V Shank - One of the best experts on this subject based on the ideXlab platform.

Nan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • in situ high temperature X Ray Diffraction study of illite
    Applied Clay Science, 2017
    Co-Authors: Guanyu Wang, Hejing Wang, Nan Zhang
    Abstract:

    Abstract Despite eXtensive researches, many aspects of the structural transformation that occur in illite on heating remain unclear. This study concentrates on samples from a mine located in Wenzhou, Zhejiang Province, China to supplement data obtained by previous investigators. In situ high temperature X-Ray Diffraction (HTXRD), infrared spectroscopy (IR), field emission scanning electron microscope (FESEM) and electron microprobe (EMP) analysis were used to record the characterization of the raw material. XRD pattern showed the illite sample was primarily in 2M 1 polytype. The phase transition from illite into dehydroXylated phase started at about 525 °C in static air and at about 550 °C in vacuum, and from dehydroXylated phase into mullite occurred at above 1100 °C. These lattice parameters of illite (RT – 1100 °C) and mullite (1125–1150 °C) both in static air and in vacuum were refined. The variations of illite lattice parameters with temperature (°C) were therefore well described. Thermal eXpansion coefficients of illite (RT – 1100 °C) were determined. In situ high temperature X-Ray Diffraction study revealed four stages during heating: eXpansion, dehydroXylation, post-dehydroXylation and mullite stages.

G H Farrahi - One of the best experts on this subject based on the ideXlab platform.

  • surface hardness measurment and microstructural characterisation of steel by X Ray Diffraction profile analysis
    International Journal of Engineering, 1995
    Co-Authors: G H Farrahi, J L Lebrun
    Abstract:

    An X-Ray Diffraction line will broaden considerably when steels change into martensitic structure on quenching. The results presented in this paper show that X-Ray Diffraction technique can be employed for a rapid and nondestructive measurement of hardness of hardened steel. Measurement on various quenched and tempered steels showed that the breadth of its Diffraction peak increased with increasing hardness. Some empirical equations are derived to correlate the width of the Diffraction line with the hardness. The Diffraction profile analysis can offer good indication about the material's characteristics and the microstructural evolution caused by heat treatment or by mechanical loading.

Russell J Hemley - One of the best experts on this subject based on the ideXlab platform.

  • in situ high pressure X Ray Diffraction study of h2o ice vii
    Journal of Chemical Physics, 2008
    Co-Authors: Maddury Somayazulu, Jinfu Shu, Changsheng Zha, Alexander F Goncharov, Oliver Tschauner, Hokwang Mao, Russell J Hemley
    Abstract:

    Ice VII was eXamined over the entire range of its pressure stability by a suite of X-Ray Diffraction techniques in order to understand a number of uneXplained characteristics of its high-pressure behavior. AXial and radial polycrystalline (diamond anvil cell) X-Ray Diffraction measurements reveal a splitting of Diffraction lines accompanied by changes in sample teXture and elastic anisotropy. In situ laser heating of polycrystalline samples resulted in the sharpening of Diffraction peaks due to release of nonhydrostatic stresses but did not remove the splitting. Radial Diffraction measurements indicate changes in strength of the material at this pressure. Taken together, these observations provide evidence for a transition in ice VII near 14 GPa involving changes in the character of the proton order/disorder. The results are consistent with previous reports of changes in phase boundaries and equation of state at this pressure. The transition can be interpreted as ferroelastic with the appearance of spontaneous strain that vanishes at the hydrogen bond symmetrization transition near 60 GPa.