The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Y T Pei - One of the best experts on this subject based on the ideXlab platform.
-
friction stir welding of monel alloy at different heat input conditions microstructural mechanisms and tensile behavior
Materials Letters, 2019Co-Authors: Akba Heidarzadeh, Ali Chabok, Y T PeiAbstract:Abstract The mechanisms governing the microstructural evolution during friction stir welding of Monel at different heat inputs and the corresponding mechanical properties were investigated. In the low heat input condition, both continuous and discontinuous dynamic Recrystallizations caused the formation of fine grains with an average grain size of 1.7 μm and closely random texture. A high heat input condition resulted in larger average grain size of 23.5 μm with shear texture by only the continuous dynamic Recrystallization. Low heat input led to the simultaneous increase of strength and elongation. The origins of the tensile behavior of the joints have been discussed.
Akba Heidarzadeh - One of the best experts on this subject based on the ideXlab platform.
-
friction stir welding of monel alloy at different heat input conditions microstructural mechanisms and tensile behavior
Materials Letters, 2019Co-Authors: Akba Heidarzadeh, Ali Chabok, Y T PeiAbstract:Abstract The mechanisms governing the microstructural evolution during friction stir welding of Monel at different heat inputs and the corresponding mechanical properties were investigated. In the low heat input condition, both continuous and discontinuous dynamic Recrystallizations caused the formation of fine grains with an average grain size of 1.7 μm and closely random texture. A high heat input condition resulted in larger average grain size of 23.5 μm with shear texture by only the continuous dynamic Recrystallization. Low heat input led to the simultaneous increase of strength and elongation. The origins of the tensile behavior of the joints have been discussed.
Hossein Beladi - One of the best experts on this subject based on the ideXlab platform.
-
characterization on ferrite microstructure evolution during large strain warm torsion testing of plain low carbon steel
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: B Eghbali, A Abdollahzadeh, Hossein BeladiAbstract:Ferrite grain/subgrain structures evolution during the extended dynamic softening of a plain low carbon steel was investigated throughout the large strain warm deformation by hot torsion. Microstructural analysis with electron back-scattering diffraction (EBSD) scanning electron microscope (FEG/SEM) was carried out on the ferrite microstructural parameters. The results showed that the warm flow stress–strain curves are similar to those affected only by dynamic softening and an extended warm flow softening is seen during large strain deformation up to 30. Furthermore, with an increase in strain up to ~ vert, similar1 the grain size of ferrite, misorientation angle and fraction of high-angle boundaries gradually decrease and fraction of low-angle boundaries increases. With a further increase in the strain beyond ~, vert, similar2, these parameters remain approximately unchanged. No evidence of discontinuous dynamic recrystallisation involving nucleation and growth of new grains was found within ferrite. Therefore, the dynamic softening mechanism observed during large strain ferritic deformation is explained by continuous dynamic Recrystallization (CDRX).
Yeon Chul Ha - One of the best experts on this subject based on the ideXlab platform.
-
Recrystallization kinetics and glass transition of rice starch gel system
Journal of Agricultural and Food Chemistry, 1997Co-Authors: Moo-yeol Baik, Ki-cheol Cheon, Yeon Chul HaAbstract:The effect of storage temperature on Recrystallization and glass transition temperature (Tg) of nonwaxy and waxy rice starch gel systems containing 60% moisture content was investigated by differential scanning calorimetry to understand the relationship between them. The nucleation and propagation for the Recrystallization process were determined by Recrystallization degree obtained from crystallite melting enthalpy changes during storage. The Recrystallization rate for both rice starch gels within 3 days of storage and its temperature dependence were analyzed by Avrami and Arrhenius equations. The maximum nucleation and propagation for Recrystallization of both rice starch gel systems occurred at 4 °C and 30 °C, respectively. The Tg slightly increased with increasing Recrystallization degree, and the highest Tg was observed in the maximum Recrystallization temperature ranges. The Tg and Recrystallization rate of nonwaxy rice starch gel were changed more than those of the waxy one, while the higher activa...
Łukasz Szamyjer - One of the best experts on this subject based on the ideXlab platform.
-
Anodic alumina growth on Al substrates after multi-variant mechanical and heat treatment
Surface and Coatings Technology, 2019Co-Authors: Małgorzata Norek, Łukasz SzamyjerAbstract:Abstract A multi-variant process of cold rolling to different reductions of thickness (0–50%) and subsequent heating under different temperature was applied to Al substrates. Next, a comprehensive analysis of the influence of various microstructural, structural, and mechanical parameters of the Al substrates on the nanopore growth in anodic aluminum oxide (AAO), was performed. As an effect, new evidences concerning an important role of Al substrate state on the AAO growth were provided. The obtained results unambiguously show that the number of dislocations is the only parameter responsible for the regular pore formation is the AAO. Since the dislocation density is greatly reduced solely after Recrystallization process, a significant reduction of the percentage of defects in AAO occurs only when Al substrate is annealed at the Recrystallization temperature (483 °C), independent of percent cold work. All microstructural (elongation, circularity, and size of grains) or structural (texture, lattice strain) parameters are irrelevant for the pore formation, until the number of dislocations in the Al substrate remains high. Therefore, before anodization Al substrate should be annealed, at least for 1 h, under the temperature ≥ Recrystallization temperature, not lower. Stress-relief anneal at temperature
