Ti-Al-V-Zr quaternary titanium alloys were designed followingα-{[Al-Ti12](AlTi2)}17-n+β-{[Al-Ti12Zr2](V3)}n,where n=1-7(the number ofβunits),on the basis of the dual-cluster formula of popular Ti-6Al-4V alloy.Such ...Ti-Al-V-Zr quaternary titanium alloys were designed followingα-{[Al-Ti12](AlTi2)}17-n+β-{[Al-Ti12Zr2](V3)}n,where n=1-7(the number ofβunits),on the basis of the dual-cluster formula of popular Ti-6Al-4V alloy.Such an alloying strategy aims at strengthening the alloy via Zr and V co-alloying in theβ-Ti unit,based on the originalβformula[Al-Ti14](V2Ti)of Ti-6Al-4V alloy.The microstructures of the as-cast alloys by copper-mold suction-casting change from pureα(n=1)toα+α’martensite(n=7).When n is 6,Ti-5.6Al-6.8V-8.1Zr alloy reaches the highest ultimate tensile strength of 1,293 MPa and yield strength of 1,097 MPa,at the expense of a low elongation of 2%,mainly due to the presence of a large amount of acicularα’martensite.Its specific strength far exceeds that of Ti-6Al-4V alloy by 35%.展开更多
Developing electrochemical energy storage devices with high energy and power densities,long cycling life,as well as low cost is of great significance.Hybrid metal-ion capacitors(MICs),commonly consisting of high energ...Developing electrochemical energy storage devices with high energy and power densities,long cycling life,as well as low cost is of great significance.Hybrid metal-ion capacitors(MICs),commonly consisting of high energy battery-type anodes and high power capacitor-type cathodes,have become a trade-off between batteries and supercapacitors.Tremendous efforts have been devoted to searching for high-performance electrode materials due to poor rate capability of anodes,low capacity of cathodes,and interior sluggish kinetic match.Carbon materials with large surface area,good electrical conductivity and stability have been considered to be ideal candidates for electrodes of MICs.In this review,the advanced carbon materials directly as cathodes and anodes of MICs are systematically summarized.Then,the key structural/chemical factors including the structure engineering,porous characteristics,and heteroatom incorporation for improving electrochemical performance of carbon materials are highlighted.Additionally,the challenges and opportunities for future research on carbon materials in MICs are also proposed.展开更多
In this paper,the seismic responses and resilience of a novel K-type superelastic shape memory alloy(SMA)self-centring(SC)eccentrically braced frame(EBF)are investigated.The simulation models of the SMA-based SC-EBF a...In this paper,the seismic responses and resilience of a novel K-type superelastic shape memory alloy(SMA)self-centring(SC)eccentrically braced frame(EBF)are investigated.The simulation models of the SMA-based SC-EBF and a corresponding equal-stiffness traditional EBF counterpart are first established based on some existing tests.Then twenty-four near-fault ground motions are used to examine the seismic responses of both EBFs under design basis earthquake(DBE)and maximum considered earthquake(MCE)levels.Structural fragility and loss analyses are subsequently conducted through incremental dynamic analyses(IDA),and the resilience of the two EBFs are eventually estimated.The resilience assessment basically follows the framework proposed by Federal Emergency and Management Agency(FEMA)with the additional consideration of the maximum residual inter-storey drift ratio(MRIDR).The novel SMA-based SC-EBF shows a much better resilience in the study and represents a promising attractive alternative for future applications.展开更多
基金supported by the Key Discipline and Major Project of Dalian Science and Technology Innovation Foundation,China(No.2020JJ25CY004)the National Basic Research Program of China(No.2020JCJQZD165)。
基金financially supported by the Key Discipline and Major Project of Dalian Science and Technology Innovation Foundation(Grant No.2020JJ25CY004)the National Basic Research Program of China(Grant No.2020JCJQZD165)。
文摘Ti-Al-V-Zr quaternary titanium alloys were designed followingα-{[Al-Ti12](AlTi2)}17-n+β-{[Al-Ti12Zr2](V3)}n,where n=1-7(the number ofβunits),on the basis of the dual-cluster formula of popular Ti-6Al-4V alloy.Such an alloying strategy aims at strengthening the alloy via Zr and V co-alloying in theβ-Ti unit,based on the originalβformula[Al-Ti14](V2Ti)of Ti-6Al-4V alloy.The microstructures of the as-cast alloys by copper-mold suction-casting change from pureα(n=1)toα+α’martensite(n=7).When n is 6,Ti-5.6Al-6.8V-8.1Zr alloy reaches the highest ultimate tensile strength of 1,293 MPa and yield strength of 1,097 MPa,at the expense of a low elongation of 2%,mainly due to the presence of a large amount of acicularα’martensite.Its specific strength far exceeds that of Ti-6Al-4V alloy by 35%.
基金financially supported by the National Natural Science Foundation of China(Nos.51872005,52072002 and 22108003)the Natural Science Foundation of Anhui Provincial Education Department(No.KJ2021A0401)+1 种基金WanJiang Scholar ProgramAnhui International Research Center of Energy Materials Green Manufacturing and Biotechnology。
文摘Developing electrochemical energy storage devices with high energy and power densities,long cycling life,as well as low cost is of great significance.Hybrid metal-ion capacitors(MICs),commonly consisting of high energy battery-type anodes and high power capacitor-type cathodes,have become a trade-off between batteries and supercapacitors.Tremendous efforts have been devoted to searching for high-performance electrode materials due to poor rate capability of anodes,low capacity of cathodes,and interior sluggish kinetic match.Carbon materials with large surface area,good electrical conductivity and stability have been considered to be ideal candidates for electrodes of MICs.In this review,the advanced carbon materials directly as cathodes and anodes of MICs are systematically summarized.Then,the key structural/chemical factors including the structure engineering,porous characteristics,and heteroatom incorporation for improving electrochemical performance of carbon materials are highlighted.Additionally,the challenges and opportunities for future research on carbon materials in MICs are also proposed.
基金The authors are grateful for the financial supports from the Research Grants Council of Hong Kong through the GRF Project(No.PolyU 152246/18E)the National Key Research and Development Program of China(No.2019YFB1600700)the Hong Kong Polytechnic University(Nos.ZE2L,ZVX6,and P0035787).The findings and opinions expressed in this paper are solely those of the authors and do not represent the view of the sponsors.
文摘In this paper,the seismic responses and resilience of a novel K-type superelastic shape memory alloy(SMA)self-centring(SC)eccentrically braced frame(EBF)are investigated.The simulation models of the SMA-based SC-EBF and a corresponding equal-stiffness traditional EBF counterpart are first established based on some existing tests.Then twenty-four near-fault ground motions are used to examine the seismic responses of both EBFs under design basis earthquake(DBE)and maximum considered earthquake(MCE)levels.Structural fragility and loss analyses are subsequently conducted through incremental dynamic analyses(IDA),and the resilience of the two EBFs are eventually estimated.The resilience assessment basically follows the framework proposed by Federal Emergency and Management Agency(FEMA)with the additional consideration of the maximum residual inter-storey drift ratio(MRIDR).The novel SMA-based SC-EBF shows a much better resilience in the study and represents a promising attractive alternative for future applications.
