Effect of Co-content on microstructure and phases of laser additive manufactured Cox(CrNi)100-x alloy

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Phase evolution and high temperature compressive strength of Ti-based alloy developed by micro-plasma powder additive manufacturing

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Effect of Stacking Fault Energy on Microstructure and Texture Evolution during the Rolling of Non-Equiatomic CrMnFeCoNi High-Entropy Alloys

The evolution of microstructure and texture in three non-equiatomic CrMnFeCoNi high-entropy alloys (HEAs) with varying stacking fault energy (SFE) has been studied in up to 90% rolling reductions at both room and cryogenic temperature. All the HEAs deform by dislocation slip and additional mechanical twinning at intermediate and shear banding at high rolling strains. The microstructure is quite heterogeneous and, with strain, becomes highly fragmented. During rolling, a characteristic brass-type texture develops. Its strength increases with a decreasing SFE and the lowering of the rolling temperature. The texture evolution is discussed with regard to planar slip, mechanical twinning, and shear banding. © 2020 by the authors. Licensee MDPI, Basel, Switzerland

Evolution of microstructure and texture during thermo-mechanical processing of a two phase Al0.5CoCrFeMnNi high entropy alloy

The evolution of microstructure and texture during thermo-mechanical processing of two phase (FCC + BCC) Al0.5CoCrFeMnNi was investigated. For this purpose, the fully recrystallized starting material having 17% of the BCC phase was warm-rolled to 75% reduction in thickness and annealed at temperatures ranging from 1000 degrees C to 1250 degrees C. The volume fractions of the two phases remained unaltered during warm-rolling. Development of a lamellar deformation structure was observed for the FCC phase which also showed presence of typical deformation components. In contrast, the BCC phase showed mechanical fragmentation indicating limited ductility and a deformation texture characterized by RD (//) and ND (//) fibers. Development of a finer recrystallized microstructure was observed after annealing at 1000 degrees C due to the grain boundary pinning exerted by the BCC phase, thus inhibiting grain growth. The BCC phase fraction decreased consistently with increasing annealing temperature. Considerable grain growth happened after annealing at 1250 degrees C due to the decrease in the BCC fraction, which greatly diminished the grain boundary pinning. The BCC phase also showed stronger ND-fiber in the primary recrystallization texture, which weakened with increasing annealing temperature due to the dissolution of this phase. Retention of the deformation texture components in the recrystallization texture of the FCC phase indicated absence of strong preferential nucleation or growth

Evolution of microstructure and texture in FeCoCr(Al, Mn)0.25 magnetic high entropy alloy during thermomechanical processing and its mechanical properties

PING 2019 is organized with the support of funds for specific university research project SVK1-2019-002.Since last decade, HEAs have gained tremendous importance due to its superior mechanical and functional properties when compared to conventional alloys. Among the different functional alloys FCC structured FeCoCr(Al, Mn)0.25 alloy possessing high magnetic saturation, high Curie temperature, low coercivity coupled with excellent tensile ductility is introduced recently. In this study, the cast and homogenized FeCoCr(Al, Mn)0.25 alloy is thermomechanically processed by cold rolling (93% reduction) and subsequent annealing at varying temperatures (800C, 900C, 1000C and 1100C for 1hr). The effect of thermomechanical processing conditions on the microstructural evolution is characterized by Electron backscattered diffraction (EBSD) studies and correlation is established between mechanical properties and evolution of microstructure and crystallographic texture

Lepidium Didymium Plant Extract as Eco-Friendly Corrosion Inhibitor for Steel in Acidic Medium

256-264The efficiency of Lepidium didymium’s aerial part for corrosion inhibition, has been explored by applying weight loss analysis, SEM, and spectroscopy technique on mild steel corrosion in 1 M H2SO4. These techniques have been used to investigate the corrosion features of the steel in the absence and existence of various quantities of Lepidium didymium’s extract. With the aid of weight-loss statistics, the ability of the plant extract to construct a defensive film on steel surfaces is investigated. The formation of a protective membrane on the steel surface by the extract has also been supported by a surface morphology analysis (SEM). At 2500 mg/L, plant extract has the best inhibitory efficiency for steel in 1 M H2SO4 is 91.16%. Lepidium didymium extract is thought to be an effective inhibitor because of the presence of heteroatoms and multiple bonds

Strengthening CoCrNi medium-entropy alloy by tuning lattice defects

National Natural Science Foundation of China; Innovation Driven Program of Central South Universit