The Experts below are selected from a list of 147 Experts worldwide ranked by ideXlab platform
J Gjonnes - One of the best experts on this subject based on the ideXlab platform.
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precipitates zones and transitions during aging of al zn mg zr 7000 Series Alloy
Materials Science and Technology, 2004Co-Authors: V Hansen, O Karlsen, Y Langsrud, J GjonnesAbstract:AbstractAge hardening of an industrial 7000 Series Alloy in the temperature range 70-150° C has been followed by mechanical testing, electrical conductivity measurement, differential scanning calorimetry and extensive electron microscopy (TEM). The property changes during aging are interpreted in terms of structural transformations that involve two types of Guinier-Preston (GP) zones (I and II), the metastable hardening precipitate η′ and the stable phase η-MgZn2, as well as coarsening, changes of composition and internal order within zones and precipitates. Time-temperature ranges of the transformations during aging, and its dependence on quenching temperature, are estimated from TEM observations. The role of the GP(II) zones in the aging of Alloys quenched from temperatures above 450°C is emphasized.
Qi Xiao-gang - One of the best experts on this subject based on the ideXlab platform.
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Effect of Melting Heat Treatment on Microstructure and Properties of Zn-Al Series Alloy and ZAS35 Alloy
Heat Treatment of Metals, 2020Co-Authors: Qi Xiao-gangAbstract:A new melting heat treatment process was designed for Zn-Al Series Alloy and ZAS 35 Alloy, and the process test was carried out. The results show that the most suitable temperature range for melting-Alloy is 810℃～830℃. After melting heat-treatment, the microstructures of Zn-Al Series Alloy are refined and uniformed, the quantity of rich-Zn β phase is increased, and the dendritic crystal is passivated.While for ZAS35 Alloy, the strength is increased greatly, the elongation is increased by 100%, and the toughness is increased by 50%.
Huang Xiaofeng - One of the best experts on this subject based on the ideXlab platform.
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Research Status and Development of Mg-Zn-Al Series Mg Alloy
Hot Working Technology, 2020Co-Authors: Huang XiaofengAbstract:The research status of Mg-Zn-Al Alloy in China and abroad was stated.The future development of ZA Series Alloy was looked forward.
Koen Van Den Abeele - One of the best experts on this subject based on the ideXlab platform.
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Non-destructive ultrasonic examination of root defects in friction stir welded butt-joints
NDT and E International, 2016Co-Authors: Morteza Tabatabaeipour, Steven Delrue, Jessica Hettler, Koen Van Den AbeeleAbstract:As a solid-state welding process, Friction Stir Welding (FSW) offers a variety of advantages over traditional welding processes. Problems that are typically occurring due to the cooling of the liquid phase, such as solidification cracking and formation of porosity, generally do not occur in FSW. Nevertheless, as a result of suboptimal settings of the welding process parameters and certain uncontrollable conditions, FSWs are still associated with a number of specific flaws, e.g. root flaws and wormholes. Ultrasonic non-destructive testing and evaluation techniques (NDT&E) can be used for quality assessment of friction stir welded joints. In this paper, a novel approach for the detection of root flaws is proposed using an immersion ultrasonic testing method in oblique incidence and backscatter mode. The backscattered energy C-scan images obtained after an empirical positioning and proper time gating can be straightforwardly interpreted by direct comparison with typical â€'flaw' patterns, allowing for identification and localization of the root flaws in the weld. The method is illustrated for FSW butt joints of the AlZnMgCu (7XXX Series) Alloy.
Zhang Juan - One of the best experts on this subject based on the ideXlab platform.
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Research of Strengthening of Al-Si Series Alloy on the Basis of Grain Refining caused by Rapid Cooling and Modification and its Application
Journal of Shandong Institute of Light Industry, 2020Co-Authors: Zhang JuanAbstract:Al Alloy is one kind of light Alloy materials which is used most extensively at present,and Al-Si Series Alloy is used the earliest and most comprehensively.In this paper,the researches on the microstructure and properties of Al-Si Series Alloy are introduced on the basis of lightweight of automobile.The microstructure is the most important factor influencing its properties.Moreover,cooling rate and modification have a far-reaching influence on microstructure of Al-Si Series Alloy,and then influence the mechanical properties of Al Alloy parts.At last,the ways to strengthen Alloys are discussed,and the future trends and performance optimization of cast Al Alloy are previewed.
