The Experts below are selected from a list of 14796 Experts worldwide ranked by ideXlab platform
Deng Pan - One of the best experts on this subject based on the ideXlab platform.
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enlarging Heat Treatment processing windows of fe si b p cu m nanocrystalline alloys by doping transition metal elements
Journal of Alloys and Compounds, 2021Co-Authors: Chuntao Chang, Zheng Xiang, Chengliang Zhao, Anding Wang, Ruirui Song, Deng PanAbstract:Abstract The crystallization behavior, Heat-Treatment Condition dependences of soft-magnetic properties and microstructural evolution in Fe83-xSi4B10P2Cu1Mx (M = V, Cr, Nb, Mo, Ta and W; x = 0–2 at%) nanocrystalline alloys were systematically investigated. We found that these transition metals can enlarge the Heat-Treatment processing window and effectively improve the soft-magnetic properties. According to the results of comparative studies, Ta and Nb are the optimal elements in stabilizing and refining the nanocrystalline microstructure. The order of the alloying effect on the optimal Heat-Treatment Conditions is: Ta=Nb>Mo=W>V>Cr, which can be correlated to the negative mixing enthalpy and atomic size difference between transition element and other component elements. The minor Nb and Ta doped alloys (1 at%) can be annealed in a large window with a temperature range of 70 K and a time range of 60 min, which are readily accepted for the industry. Superior soft-magnetic properties containing high Bs of 1.73 T, Hc of 8.4 A/m and μe of 21 × 103 were obtained in the sample annealed at 743 K in 60 min. These high-performance alloys should be promising candidates for the mass production and the effects of transition metal alloying can be good references for the future development of high Bs alloys.
Sarcar Mohammed Moulana Mohiuddin - One of the best experts on this subject based on the ideXlab platform.
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mechanical and tribological properties of aa7075 tic metal matrix composites under Heat treated t6 and cast Conditions
Journal of materials research and technology, 2016Co-Authors: Ramakoteswara Rao Veeravalli, Ramanaiah Nallu, Sarcar Mohammed Moulana MohiuddinAbstract:Abstract The sliding friction and wear behavior of aluminum matrix composites (AA7075–TiC) have been investigated under dry sliding wear Conditions. The aluminum metal matrix composites (AMMCs) are produced as AA7075 matrix metal and TiC particulates of an average size of 2 μm as reinforced particles through stir casting. AMMCs studied are contained 2–10 wt.% of TiC particles in both as cast and Heat treated (T6) Conditions. All the composites exhibited better mechanical properties (hardness, tensile strength and percentage of elongation) than the matrix metal in both the Conditions. The wear tests were carried out at a sliding velocity of 2 m/s, sliding distance 2 km and at normal load of 20 N. The wear resistance of the composites increased with increasing weight percentage of TiC particles, and also the wear rate was notably less for the composite material compared to the matrix material. A detailed analysis in as-cast Condition and T6 Condition of the AMMCs was carried out using SEM in order to find out the influence of TiC particles in the AMMCs formed. It has been observed that under T6 Heat Treatment Condition, matrix as well as composite shown significant improvement in mechanical and tribological properties when compared in as cast Condition.
Guillermo Requena - One of the best experts on this subject based on the ideXlab platform.
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synchrotron based holotomography and x ray fluorescence study on the stress corrosion cracking behavior of the peak aged 7075 aluminum alloy
Journal of Alloys and Compounds, 2020Co-Authors: Christoph Altenbach, Christian Schnatterer, Ulises Alfaro Mercado, Jussipetteri Suuronen, Daniela Zander, Guillermo RequenaAbstract:Abstract The demand to reduce weight in the automobile industry necessitates an enhanced understanding of the stress corrosion cracking (SCC) mechanism of 7xxx series aluminum wrought alloys. Thus, the SCC susceptibility of 7075 aluminum wrought alloy wires, with respect to the Heat Treatment Condition, solution annealed, peak-aged and overaged, was investigated via slow strain rate testing in 3.5 wt % sodium chloride solution. The SCC crack, initiated in a notched tensile specimen of the peak-aged Condition, was investigated in detail by means of synchrotron-based high resolution holotomography and X-ray fluorescence as well as STEM in order to understand the correlation of microstructural features and cracking behavior. The local crack initiation and macroscopic crack propagation was found to be dependent on the stress fields, which were simulated by the finite element method. In the peak-aged Condition, the SCC crack propagated microscopically along the grain boundaries leading to a brittle intergranular fracture. The SCC mechanism in the peak-aged Condition was related to a combination of hydrogen embrittlement and an anodic-dissolution-induced notch effect that was attributed to a continuous seam of grain boundary (GB) precipitates.
Chuntao Chang - One of the best experts on this subject based on the ideXlab platform.
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enlarging Heat Treatment processing windows of fe si b p cu m nanocrystalline alloys by doping transition metal elements
Journal of Alloys and Compounds, 2021Co-Authors: Chuntao Chang, Zheng Xiang, Chengliang Zhao, Anding Wang, Ruirui Song, Deng PanAbstract:Abstract The crystallization behavior, Heat-Treatment Condition dependences of soft-magnetic properties and microstructural evolution in Fe83-xSi4B10P2Cu1Mx (M = V, Cr, Nb, Mo, Ta and W; x = 0–2 at%) nanocrystalline alloys were systematically investigated. We found that these transition metals can enlarge the Heat-Treatment processing window and effectively improve the soft-magnetic properties. According to the results of comparative studies, Ta and Nb are the optimal elements in stabilizing and refining the nanocrystalline microstructure. The order of the alloying effect on the optimal Heat-Treatment Conditions is: Ta=Nb>Mo=W>V>Cr, which can be correlated to the negative mixing enthalpy and atomic size difference between transition element and other component elements. The minor Nb and Ta doped alloys (1 at%) can be annealed in a large window with a temperature range of 70 K and a time range of 60 min, which are readily accepted for the industry. Superior soft-magnetic properties containing high Bs of 1.73 T, Hc of 8.4 A/m and μe of 21 × 103 were obtained in the sample annealed at 743 K in 60 min. These high-performance alloys should be promising candidates for the mass production and the effects of transition metal alloying can be good references for the future development of high Bs alloys.
M. J. Robinson - One of the best experts on this subject based on the ideXlab platform.
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corrosion product force measurements in the study of exfoliation and stress corrosion cracking in high strength aluminium alloys
Corrosion Science, 2003Co-Authors: D Mcnaughtan, M Worsfold, M. J. RobinsonAbstract:Abstract Exfoliation corrosion was assessed in three high strength aluminium alloys by measuring the force generated by voluminous corrosion products and their stress corrosion behaviour was studied in tests on double cantilever specimens. There was an inverse linear relationship between the corrosion product forces and the K ISCC values for stress corrosion cracking in these materials, providing further evidence for a common corrosion mechanism. Exfoliation and SCC were both dependent on the rate of intergranular corrosion, which is controlled in these alloys by the grain boundary precipitates and the resistance to both forms of corrosion was improved in alloys with an over-aged Heat Treatment Condition.