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Phonon bottleneck effect due to finite shrinking gap revealed by high-pressure ultrafast dynamics 认领 引用
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作者 Yanling Wu Q.Wu +9 位作者 X.Yin Y.X.Huang Takeshi Nakagawa Z.Y.Tian Fei Sun Q.M.Zhang Jun Chang Ho-kwang Mao Yang Ding Jimin Zhao 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第3期137-142,共6页
High-pressure ultrafast dynamics has been recently developed,enabling the exploration of non-equilibrium properties of various quantum materials under high pressure.Particularly,by investigating the pressure dependenc... High-pressure ultrafast dynamics has been recently developed,enabling the exploration of non-equilibrium properties of various quantum materials under high pressure.Particularly,by investigating the pressure dependence of time-resolved ultrafast dynamics,we have discovered a pressure-induced phonon bottleneck effect(PBE).To date,all reported PBEs are due to fully closed gaps,which was reflected in the simultaneous characteristic changes in both amplitude and lifetime of the phonon-phonon scattering slow relaxation component.However,as reflected through its connection to Euler disk,incompletely closed gaps can also induce PBEs.In this work,we report the first PBE due to a finite shrinking gap.As is known,it is challenging to directly observe high-pressure-induced variations in electronic band gaps due to the diamond anvil cell.Here,by investigating Sr2IrO4in our previous work,we obtain an empirical formula for the pressure-induced energy gap variation at room temperature.Our quantitative analysis shows that the gap is finite shrinking rather than fully closed. 展开更多
关键词 phonon bottleneck effect ultrafast dynamics high pressure ultrafast spectroscopy finite gap
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Effect of Temperature on Material Transfer Behavior at Different Stages of Friction Stir Welded 7075-T6 Aluminum Alloy 认领 引用 被引量：16
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作者 S.D.Ji Y.Y.Jin +3 位作者 Y.M.Yue S.S.Gao Y.X.Huang L.Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2013年第10期955-960,共6页
In this work, the morphologies of weld of 7075-T6 aluminum alloy via friction stir welding （FSW） were analyzed by optical microscopy, the temperature field was attained by numerical simulation, and the effect of tem... In this work, the morphologies of weld of 7075-T6 aluminum alloy via friction stir welding （FSW） were analyzed by optical microscopy, the temperature field was attained by numerical simulation, and the effect of temperature on material transfer behavior in the thermal-mechanical affected zone （TMAZ） at different stages was mainly investigated. The FSW process consists of three stages. It is very interesting to find that the maximum transfer displacement of material appears at the final stage of welding process, then at the stable stage and at the initial stage, which results from the difference of peak temperatures at different stages. At any stage, the material in TMAZ near the surface of weld transfers downwards, the material in the middle of weld moves upwards and the material near the bottom of weld hardly moves. In any cross section of weld, the largest transfer displacement of material appears in the middle of weld. The increase of rotational velocity and the decrease of welding speed are both beneficial to the transfer displacement of material in the middle of weld. 展开更多
关键词 Friction stir welding 7075-T6 aluminum alloy Thermal-mechanical affected zone Material transfer Numerical simulation
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