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Showing 1 to 11 of 11 for “"Abnormal Grain Growth"”.
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ABNORMAL GRAIN GROWTH IN MAGNETOSTRICTIVE GALFENOL ROLLED SHEET
… NbC particles enhance the rollability of and abnormal grain growth (AGG) in polycrystalline Galfenol rolled sheet. Driving forces, due to grain boundary energy, surface energy, deformation energy and magnetic fields are generally considered to explain grain growth phenomena. In this …
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Abnormal Grain Growth of AA2195 Friction Stir Weld Nugget during Solution Heat Treatment
… is one option. Previous research has shown that Abnormal Grain Growth (AGG) usually occurs in the weld nugget during PWSHT due to nugget instability at elevated temperatures. The current investigation is conducted to understand AGG in AA2195 FSW nugget during PWSHT and to determine the effect of …
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Abnormal Grain Growth of Tungsten Carbide in Small Amount of Cobalt: Mechanism and Application
<P>CONSIDERABLE ABNORMAL GRAINS WERE OBSERVED IN LIQUID PHASE SINTERED CEMENTED WC WITH 0.2~0.9WT% COBALT. MICROSTRUCTURE EXAMINATIONS SHOWED GRAIN BOUNDARIES PARALLEL TO (0001) PLANES AND AGG WAS EXPLAINED BY GRAIN BOUNDARY RE-ENTRANT EDGE (GBRE) ASSISTED 2-D NUCLEATION PROCESS. GRAIN COALESCENCE …
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Modeling tin sulfide grain growth during post-processing
… further research is being done on the grain structure and how grain growth occurs under different annealing conditions. After thermal evaporation deposition, three different conditions were varied during annealing to affect grain growth: time, temperature, and annealing atmosphere. The …
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Phase Field Modeling of Grain Growth in Porous Polycrystalline Solids
The concurrent evolution of grain size and porosity in porous polycrystalline solids is a technically important problem. All the physical properties of such materials depend strongly on pore fraction and pore and grain sizes and distributions. Theoretical models for the pore-grain boundary …
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Friction stir welding of commercially available superplastic aluminium
… creates a wider weld region of fine equiaxed grains which are suitable for SPF. These original tools have been compared to tools which are already in mainstream FSW production. The welds created for this investigation also represent an evolution of friction stir welding by starting with a …
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The effects of dopants and complexions on grain boundary diffusion and fracture toughness in α-Al2O3
Grain boundaries often play a dominant role in determining material properties and processing, which originates from their distinct local structures, chemistry, and properties. Understanding and controlling grain boundary structure-property relationships has been an ongoing challenge that is …
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Centrifuge-aided Micromolding and Sintering of Micron- and Submicron-sized Ceramic Features
… sintering process destructs the ZnO features via abnormal grain growth and surface roughening. Destruction prediction of features using sintering time is established based on grain growth. Feature surface roughening is further analyzed with respect to thermodynamic fundamentals. Because of the …
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Sintering techniques for microstructure control in ceramics
… enhance densification while reducing the average grain size to as small as 1.4μm, lower than the starting powder size of 1.8μm. While a high flexural strength of 670MPa was observed, a strength dependence on the ZrC grain size indicative of CTE mismatch residual stresses was also seen. Finally, …
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Modification and Integration of Shape Memory Alloys Through Thermal Treatments and Dissimilar Metal Joining
… in achievable actuation frequency and the growth of micro-scale applications in medical devices, the anisotropy of the shape memory response at the grain level becomes an important consideration for optimizing device performance. The formation of crystallographic texture in NiTi thin films …
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The Chemistry and Crystallography of Doped Bixbyite, Braunite and Novel Anion-Deficient Fluorite Oxides
… sample characterisation. Flux free vapour aided abnormal grain growth (AGG) methods were developed to grow large neutron quality single crystals which were used to conduct the first low temperature single crystal Laue diffraction experiments to verify the magnetic structure. This was coupled with …