In situ high-energy X-ray diffraction study of tensile deformation of neutron-irradiated polycrystalline Fe-9%Cr alloy

Abstract

2017-08-30T02:06:37

In situ synchrotron tensile investigations on ultrasonic additive manufactured (UAM) zirconium

“…Using in situ synchrotron wide-angle X-ray scattering (WAXS), a series of microstructure evolution information related to both elastic and plastic deformation can be unveiled by interpreting the diffraction information collected from a strain specimen. In the past decade, in situ synchrotron tensile tests have been successfully applied to a series of different advanced structural materials [10][11][12][13][14][15][16][17].…”

In situ high-energy X-ray diffraction mapping of Lüders band propagation in medium-Mn transformation-induced plasticity steels

“…Generally, the FWHM values increase with the applied strain, indicating a high level of subgrain-scale activities during plastic deformation [24]. The FWHM of facecentred-cubic (FCC) γ peaks were evaluated by modified Williamson-Hall (W-H) plot.…”

“…Values for C hkl for edge type {111} < 110 > and screw type {111} dislocations in γ can be calculated using the ANIZC software [25], with elastic constants inputs of c 11 = 164 GPa, c 12 = 113 GPa, c 44 = 133 GPa [26]. To find the optimum C hkl , the modified W-H fitting using the C hkl with the screw/edge ratio ranging from 0 to 1 was performed with a 0.01 step size, and the C hkl that gave the highest R-square value was selected [24]. The analysis of the modified W-H plots of the two selected points located in front of and behind the Lüders band are shown in Figure 5(a) and Figure 5(b), respectively, and the location of the two points are marked in Figure 5(c).…”

Mechanical Properties and Deformation Behavior of Additively Manufactured 316L Stainless Steel (FY2020)

“…The area detector signals were first converted to 1-dimensional (1D) diffraction profiles in the loading direction by summing up the intensities of each Debye-Scherrer ring from ±10° around the loading direction, and the peaks were fitted for peak positions to obtain the lattice strain as a function of tensile strain in the loading direction. The entire area's detector signals were then processed and fitted to obtain the full-width at half-maximum (FWHM) using a method detailed in Zhang et al [16]. The FWHM data were analyzed using the modified Williamson-Hall (W-H) method [17] to obtain the evolution of dislocations and the coherently scattering domain sizes with deformation,.…”

“…The FWHM data were analyzed using the modified Williamson-Hall (W-H) method [17] to obtain the evolution of dislocations and the coherently scattering domain sizes with deformation,. Details of the FWHM data analysis method can also be found in Zhang et al [16]. The x-ray radiographs taken from the gage center of AM316L (Figure 4-22) reveal the sample's internal porosity.…”