Dislocation density can be measured from the profile analysis of X-ray diffraction. Measuring the dislocation density in materials helps in the analysis of material strength.
◆The Significance of Measuring Dislocation Density in Materials There are several methods for strengthening metallic materials: 1. Work hardening, 2. Precipitation strengthening, 3. Solid solution strengthening, and 4. Refinement of grain size, all of which enhance strength by suppressing the movement of dislocations. Dislocations are defects that occur within the metal when it is deformed, and their movement within the crystal facilitates further deformation. The factors that inhibit the movement of dislocations for each of the aforementioned strengthening methods are as follows: 1. Increase in the number of dislocations 2. Fine precipitates 3. Strain caused by the mixing of elements of different sizes 4. Increase in the proportion of grain boundaries Therefore, measuring the dislocation density in materials is useful for analyzing material strength.
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basic information
◆Overview of Dislocation Density Measurement X-ray diffraction (XRD) is one method for evaluating crystalline materials. The X-ray diffraction profile is influenced by lattice defects such as dislocations, allowing for the measurement of dislocation density. However, our company has adopted a computational method (DF/mWH method) developed by the Kyushu University laboratory, which specializes in steel materials, enabling accurate evaluation of dislocation density. ◆Overview of Measurement Principle Since the position of the diffraction peaks in XRD represents interatomic distances, variations in interatomic distances caused by dislocations (shifts in atomic positions) result in broader peak widths in XRD measurements. Therefore, by theoretically calculating the peak widths obtained from XRD measurements, it is possible to determine the dislocation density.
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Applications/Examples of results
◆Measurement Example Various nominal strains were applied to SUS316L, and as a result of measuring the dislocation density, a correlation with the nominal strain was confirmed.
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Daitō Analysis Research has been advancing the establishment of an advanced think tank based on highly reliable analysis and analytical techniques accumulated in various material fields, as well as the challenges received from a wide range of industry customers. We aim to solve our customers' various issues with the least cost and the shortest delivery time. Moving forward, we would like to support our customers' research and development using the latest equipment and advanced manpower, and assist in creating products that enrich the future.
