[en] A bibliography of the scientific information originating in the Metals and Ceramics Division of ORNL during the period 1970 through 1974 is presented. The master listing contains 925 references, for which both subject and author indexes are provided

[en] The identification by ⁵⁷Fe internal field nuclear magnetic resonance (NMR) of hyperfine fields at four Fe sites in the (average) tetragonal unit cell of vacancy-ordered γ-Fe₂O₃ (maghemite) is reported. The effects of vacancy redistribution due to annealing the partially vacancy-ordered form has been observed in the ⁵⁷Fe lineshape. In addition, the reduction of the particle size of the vacancy-ordered form has been observed to gradually eliminate the vacancy ordering and then to cause a transition from ferrimagnetism to superparamagnetism.

[en] Intense research is currently directed towards realising metal-organic frameworks (MOFs) for industrially-applied gas separation and storage due to their unique structural properties, including: robustness; thermal and chemical stability; unprecedented internal surface area; and high void volume. A particular focus of current research is the development of MOFs for the separation of CO, from the other components of flue gas in fossil-fuelled power plants. The use of NPD to study gas adsorption in framework materials is a relatively new but growing field. Structural measurements, which show the arrangement of both the host and guest, allow derivation of the nature of the host-guest interaction, and the host's response to the guest. The capability to perform these measurements, with accurate gas dosing and temperature control, has recently been realised at ANSTO's Bragg Institute. Using these techniques, we have investigated the adsorption mechanisms of a number of gases in selected new and established MOFs that display impressive selectivity for specific gases. The location and orientation of industrially-relevant gases including D₂, 0₂, CO₂, and CD₄, within their crystal structures provide insights into the modes of binding, which will help to tune the materials' performance and benefit the design and development process for the next generation of materials.

[en] Spatial variations of residual stresses were determined through the thickness of 70 mm thick ferritic steel welds created using low (1.7 kJ mm⁻¹) and high (56 kJ mm⁻¹) heat inputs. Two-dimensional maps of the longitudinal residual stress were obtained by using the contour method. The results were compared to neutron diffraction measurements through the thickness at different locations from the weld centerline. The deep hole drilling technique was utilized to confirm the maximum stress locations and magnitudes. The results show that significant tensile stresses (∼90% of yield strength) occur along the weld centerline near the top surface (within 10% of the depth) in the low heat-input specimen. Meanwhile, in the high heat-input weld, the peak stress moved towards the heat-affected zone at a depth of ∼40% of the thickness. Finally, the influence of residual stresses on potential fracture behavior of the welded joints is discussed

[en] Highlights: • Cold-rolling leads to increased amounts of grain boundaries and dislocations. • Cold-rolling increases the susceptibly of 316L alloy to corrosion in molten salt. • Grain boundaries and dislocations govern corrosion resistance. • Alloying elements diffuse to grain boundaries and dislocations. • Alloying elements react with molten salt to form Cr, Mo corrosion products. - Abstract: The effect of cold-rolling on the microstructure and molten salt corrosion behaviour of 316L alloy was investigated. Corrosion tests were performed in FLiNaK salt at 600 °C for 300 h. The present results indicate that cold-rolling leads to enhanced corrosion in molten salt despite its beneficial effect on the alloys mechanical properties. It is shown that the corrosion resistance of cold-rolled 316L alloy is largely governed by the presence of high-angle grain boundaries (HAGBs) and geometrically-necessary dislocations (GNDs). Exacerbated corrosion is thus directly related to the increased prevalence of grain boundaries and dislocations within the microstructure.

[en] Highlights: • Accurate density information is required to estimate many soft magnetic properties. • Gas pycnometer well suited for amorphous and nanocrystalline density estimation. • Many amorphous alloy densities are well described by a single regression function. • Density change of amorphous alloys after nanocrystallization is between 0.5 and 3%. • Density change of fully crystalline precursor ingot to amorphous ribbon is 2–3%. -- Abstract: The density of amorphous and nanocrystalline soft magnetic alloys is often vital to accurately estimate the saturation magnetic polarization and other properties. However, this information is often missing from the literature of amorphous and nanocrystalline alloys, possibly due to the challenges associated with using the Archimedes buoyancy method with high specific surface area melt-spun ribbons. In this work, a review of the literature has been conducted to determine the density (ρ in 10³ kg/m³) of alloys in an amorphous state and, in combination with our experimental observations, is found to be well described by the following regression function: ρ = 7.751 + 0.010C^Co + 0.010C^Ni + 0.027C^Nb + 0.017C^Cu – 0.020C^B – 0.039C^Si – 0.032C^P, where Cⁱ is the content of i element in at.% and the fitting error is within approximately 1%. Unlike previous works in this area, this study estimated the change in density upon amorphization and subsequent nanocrystallization for melt-spun Fe-B alloys using a He gas pycnometer. A selection of other common soft magnetic alloy systems including FINEMET, NANOPERM, NANOMET and HiB-NANOPERM are also tested. The change in density upon nanocrystallization is seen to vary between 0.5 and 3%, depending on the alloy composition. This change in density is well described by the volume-weighted average densities of the residual amorphous and crystalline phases. The difference in density between a crystalline precursor ingot and after amorphization by melt spinning was observed to vary between 2 and 3%.