The Experts below are selected from a list of 4911 Experts worldwide ranked by ideXlab platform
Huibin Xu - One of the best experts on this subject based on the ideXlab platform.
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the microstructure and tensile Property Degradation of a gamma tial alloy during isothermal and cyclic high temperature exposures
Intermetallics, 2011Co-Authors: Wenyue Zhao, Danhua Zhang, Shengkai Gong, Huibin XuAbstract:The microstructure and tensile Property changes of a γTiAl-based alloy, Ti-47Al-2Cr-2Nb-0.15B, during isothermal and cyclic high temperature exposures have been investigated. Microstructure coarsening, including the fracture, dissolution and spheroidization of α2 lamellae, is considered to be the main cause of the evident tensile Property decreases of the alloy after isothermal and cyclic high temperature exposures. Dislocation emission near the broken lamellae is also an important phenomenon in the microstructure Degradation during cyclic high temperature exposure, which originated from the thermal mismatch between α2 and γ phases.
Stephen W Tsai - One of the best experts on this subject based on the ideXlab platform.
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modeling of mechanical Property Degradation by short term aging at high temperatures
Composites Part B-engineering, 2002Co-Authors: Stephen W TsaiAbstract:A study on the mechanical Property Degradation by short-term aging at high temperatures is performed. Samples are manufactured using a thermoplastic polymer (PEEK) and advanced polymer composite-2 (APC-2), and are aged at different temperatures for different times. The flexural properties of the aged samples are measured by 4-point bending tests. An appropriate mathematical equation is proposed to model the Degradation data as a function of time and temperature. Numerical techniques are employed to find the optimal values of the parameters using transient temperature profiles. The evaluated results are discussed in comparison with results from previous works to prove the validity of the model. Physical interpretations of the results are provided to support assumptions involved in the model. To illustrate the effectiveness of the model, it was applied to a simulated manufacturing process and a mathematically defined service condition. The model could successfully predict the Property loss during manufacturing and service, which could be utilized as a reference in determining the durability and the lifetime of the product.
Wenyue Zhao - One of the best experts on this subject based on the ideXlab platform.
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the microstructure and tensile Property Degradation of a gamma tial alloy during isothermal and cyclic high temperature exposures
Intermetallics, 2011Co-Authors: Wenyue Zhao, Danhua Zhang, Shengkai Gong, Huibin XuAbstract:The microstructure and tensile Property changes of a γTiAl-based alloy, Ti-47Al-2Cr-2Nb-0.15B, during isothermal and cyclic high temperature exposures have been investigated. Microstructure coarsening, including the fracture, dissolution and spheroidization of α2 lamellae, is considered to be the main cause of the evident tensile Property decreases of the alloy after isothermal and cyclic high temperature exposures. Dislocation emission near the broken lamellae is also an important phenomenon in the microstructure Degradation during cyclic high temperature exposure, which originated from the thermal mismatch between α2 and γ phases.
Peng Wang - One of the best experts on this subject based on the ideXlab platform.
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nonuniform transitions of heavy ion irradiated a c h films structure and antiwear Property Degradation analysis
Carbon, 2019Co-Authors: Jiao Xu, Zewen Duan, Li Qiao, Liqiang Chai, Zhang Chen, Peng WangAbstract:Abstract A study on hydrogenated amorphous carbon films (a-C:H) was performed to assess the heavy-ion radiation damage and the nature of defects produced by 1.0 MeV Ni ions of fluences varying between 1014-1015 ions/cm2. The morphology, chemical and optical structures, and mechanical and tribological properties of the films before and after irradiation were examined. Additionally, the effects of nonuniform structures throughout the films on their antiwear properties were discussed. Studies of the wear tracks have suggested that above the maximum damage depth, film wear rates are mainly related to surface roughness, while after that depth, a rapid failure occurs and wear rates change to be closely related to the irradiation fluence. By making steel pits on irradiated films at varied depths of 0–900 nm, visible/ultra violet Raman diagnostics in the depth direction in the definite penetration depth were achieved, and some striking observations were made that the local sp3-to-sp2 transition in the projected range is approximately 700 nm, accompanied by a bombardment-induced hydrogen release that is most severe on the topmost surface of a-C:H films. It is the combined effects of these two factors that contribute to the rapid failure of irradiated films, particularly at the depth of the projected range.
K Logesh - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation on radiation heat transfer Property Degradation of aluminium solar receiver tube material
International journal of ambient energy, 2018Co-Authors: K Logesh, R Ganesh, V RameshAbstract:ABSTRACTThe study of surface heat transfer Property Degradation is mandatory as the solar water heater receiver tubes operating temperature increases. In this study, investigation is carried out on the radiation heat transfer Property Degradation of aluminium material. The emissivity () and absorptivity (α) of aluminium surface has been measured before and after exposing to sunlight in four interval between 240 and 960 h. Moreover, these properties’ variations are also temperature dependent; hence temperature dependency of the above-said properties are measured at 10 equal intervals. Unlike those of stainless steel [Mageshwaran, G., S. Ramachandran, G. Iyappan, and R. B. Durairaj. 2016. Experimental Investigation on Surface Radiation Properties’ Degradation of Solar Collector Receiver Tube Material. International Journal of Ambient Energy doi:10.1080/01430750.2016.1202139], both the properties increases for aluminium, and temperature dependency is strong after 150°C. The absorptivity increases at lower ra...
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Experimental investigation on radiation heat transfer properties Degradation of (black nickel-coated aluminium) solar receiver tube material
International journal of ambient energy, 2017Co-Authors: A. Vasudevan, P. Muralinath, K. Subramani, K LogeshAbstract:In our previous research, we have studied the surface Property Degradation of the uncoated receiver tubes of solar water heater at elevated temperatures Logesh et al. [2017. “Experimental Investiga...
