Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Liu, X. J.*; 徐 平光; 城 鮎美*; Zhang, S. Y.*; 菖蒲 敬久; 行武 栄太郎*; 秋田 貢一*; Zolotoyabko, E.*; Liss, K.-D.*
Journal of Materials Science, 57(46), p.21446 - 21459, 2022/12
被引用回数：0 パーセンタイル：0(Materials Science, Multidisciplinary)In situ time/temperature-resolved synchrotron high-energy X-ray diffraction is applied to study heat-mediated structural changes and phase transformations in rolled sheets of AZ91 and AZ31 magnesium alloys. Azimuthal diffraction intensities along the Debye-Scherrer rings (AT-plots) are used to obtain information on grain recovery and recrystallization temperatures as well as temperature-assisted grain rotations. The azimuthally integrated diffraction intensities, plotted as functions of the scattering vector (QT-plots), provide vital data on the temperature-dependent lattice parameters of the Mg/Al matrix and intermetallic precipitates, as well as on the evolution of the precipitates' volume fraction. It was found that in AZ31, the main precipitates are of the AlMn type, which is rather stable in the investigated temperature range (up to 773 K). In contrast, in AZ91, the major intermetallic precipitates, Al
Mg
, undergo complete dissolution above 600 K. It is caused by the enhanced diffusion of Al into the Mg/Al matrix, which according to the Al-Mg phase diagram, can adopt more Al at elevated temperatures. This diffusion is revealed by the proportional diminishing of the matrix lattice parameter (chemical strain), allowing us to quantify the Al content in the matrix. Fast temperature-dependent manipulation with intermetallic content in the Mg/Al alloy can, in principle, be used for controlling its mechanical properties.
徐 平光; 秋田 貢一; 鈴木 裕士; 盛合 敦; 鈴木 徹也*; 行武 栄太郎*
日本材料学会第46回X線材料強度に関するシンポジウム講演論文集, p.24 - 27, 2012/07
Conventional X-ray diffraction and recent electron backscattering diffraction are widely employed to investigate the surface texture information for a specific sample, but the neutron diffraction is well known to directly measure the bulk average texture information with high statistics. In order to increase the accessibility to neutron diffraction bulk texture measurement instruments, JAEA has upgraded two angle dispersive neutron diffractometer RESA-2 and MUSASI-L. In this paper, the bulk texture measurement environments based on the angle dispersive neutron diffraction were introduced, and the application research cases to the bulk texture changes during the isothermal annealing of ARBed IF steels and during the warm press deformation of a magnesium alloy were reported here to show the good texture evaluation reliability.
徐 平光; 鈴木 徹也*; 行武 栄太郎*; 諸岡 聡*
no journal, ,
For sheet/pipeline metallic materials, texture control is one of important technical fields in order to realize good formability. Though the X-ray diffraction and the electron backscattering diffraction are usually used in the texture researches, the neutron diffraction can directly measure the bulk textures of various materials and provide high statistical texture information for the material property simulation. In this paper, several research cases of bulk texture measurements based on MUSASI-L/RESA-2 neutron diffractometer were introduced, including IF steel, multilayered steel composite, magnesium alloy and titanium alloy, suggesting that the broad application of bulk texture evaluation technique has become available in Japan.
