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Journal of Materials Science & Technology 2009年第5期25卷 645-648页

作者： Hojat Ahmadi d.y.li Meisam Nouri Faculty of Biosystems Engineering University of TehranIran department of Chemical and Materials Engineering University of AlbertaEdmontonCanada department of Materials Engineering Tarbiat Modares UniversityTehranIran

TiNi alloy has a high resistance to wear and could be an excellent candidate for various tribological applications. But studies show that oxygen active elements can improve properties of some alloys, markedly. yttrium is one of the oxygen active elements. In this paper, the effects of yttria addition on properties of TiNi have been studied via micro-indentation, hardness, wear and corrosive wear tests. It is demonstrated that by addition of yttria to 5%, TiNi alloy can own improved mechanical properties and resistance to wear and corrosive wear.

关键词： yttria TiNi Mechanical behavior Wear corrosive Wear

Potential application of electron work function in analyzing fracture toughness of materials

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Journal of Materials Science & Technology 2017年第10期33卷 1128-1133页

作者： Hao Lu Chenxin Ouyang Xianguo yan Jian Wang Guomin Hua Reinaldo Chung d.y.li department of Chemical and Materials Engineering University of Alberta Edmonton. Alberta T6G 1H9 Canada College of Materials Science and Engineering Donghua University Shanghai 201620 China School of Mechanical Engineering Taiyuan University of Science and Technology Taiyuan 030024 China Extraction Reliability Engineering Suncor Energy Inc. Fort McMurray Alberta Canada

Fracture toughness determines materials＇ resistance to fracture, which is measured often using impact or bending tests. However, it is difficult to evaluate fracture toughness of coatings and small *** this article, using white irons as sample materials, we explore a possible approach of using electron work function（EWF） as an indicator in evaluating fracture toughness of hard metallic materials. This parameter is promising for being utilized to analyze toughness of protective coatings and small objects as well as bulk materials. Through comparison with results obtained from impact tests and elastic modulus measurement, effectiveness of this EWF approach is demonstrated.

关键词： Fracture toughness Elastic modulus Electron work function

Hot deformation and Work Hardening Behavior of an Extruded Mg–Zn–Mn–y Alloy

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Journal of Materials Science & Technology 2015年第12期31卷 1161-1170页

作者： N.Tahreen d.F.Zhang F.S.Pan X.Q.Jiang d.y.li d.L.Chen department of Mechanical and Industrial Engineering Ryerson University College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Advanced Materials Research Center Chongqing Academy of Science and Technology Faculty of Materials and Energy Southwest University department of Chemical and Materials Engineering University of Alberta

The aim of this study was to evaluate the strain hardening and hot deformation behavior of asextruded Mg-Zn-Mn （ZM31） magnesium alloy with varying y contents （0.3, 3.2, and 6 wt%） via compression testing along the extrusion direction at room temperature, 200℃ and 300 ℃. Texture and phases were identified by X-ray diffraction. Alloy ZM31 ＋ 0.3y consisted of a mixture of fine equiaxed grains and elon- gated grains with 1-phase （Mg3yZno）; alloy ZM31 ＋ 3.2y contained 1-phase and W-phase （Mg3y2Zn3）; alloy ZM31 ＋ 6y had long-period stacking-ordered （LPSO） X-phase （Mg12yZn） and Mg24y5 particles. With increasing y content the basal texture became weakened significantly. While alloys ZM31 ＋ 0.3y and ZM31 ＋ 3.2y exhibited a skewed true stress-true stain curve with a three-stage strain hardening feature caused by the occurrence of {1072} extension twinning, the true stress-true stain curve of alloy ZM31 ＋ 6y was normal due to the dislocation slip during compression. With increasing temperature the extent of skewness decreased. While the compressive yield stress, ultimate compressive stress, strain hardening exponent, and hardening capacity all decreased as the temperature increased, the retention of the high- temperature deformation resistance increased with increasing y content mainly due to the presence of thermally-stable LPSO X-ohase.

关键词： Magnesium alloy yttrium effect Temperature effect Strain hardening I and W-phase LPSO X-phase

The strain rate sensitive and anisotropic behavior of rare-earth magnesium alloy ZEK100 sheet

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Journal of Magnesium and Alloys 2023年第3期11卷 882-891页

作者： H.Wang X.Sun S.Kurukuri M.J.Worswick d.y.li y.H.Peng P.d.Wu State Key Laboratory of Mechanical Systems and Vibration Shanghai Jiao Tong UniversityShanghai 200240China Materials Genome Initiative Center Shanghai Jiao Tong UniversityShanghai 200240China department of Mechanical and Mechatronics Engineering University of WaterlooWaterlooOntario N2L 3G1Canada department of Mechanical Engineering Mc Master UniversityHamiltonOntario L8S 4L7Canada

To overcome the limitation in formability at room temperature,manufacturers have developed magnesium alloys with remarkable properties by adding rare-earth *** rare-earth magnesium alloys behave differently from the conventional alloys,especially with respect to their coupled anisotropic and strain rate sensitive *** the current work,such behavior of the rare-earth Mg alloy ZEK100 sheet at room temperature is investigated with the aid of the elastic viscoplastic self-consistent polycrystal plasticity *** strain rate sensitivities(SRSs)for various deformation modes are employed by the model to simulate the strain rate sensitive behaviors under different loading directions and loading *** agreement between the experiments and simulations reveals the importance and necessity of using different SRSs for each deformation mode in hexagonal close-packed ***,the relative activities of each deformation mode and the texture evolution during different loadings are *** anisotropic and strain rate sensitive behavior is ascribed to the various operating deformation modes with different SRSs during loading along different directions.

关键词： Rare-earth magnesium alloy Strain rate sensitivity Twinning Crystal plasticity

Microstructure and mechanical properties of Mg-to-Al dissimilar welded joints with an Ag interlayer using ultrasonic spot welding

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Journal of Magnesium and Alloys 2020年第2期8卷 552-563页

作者： H.Peng d.L.Chen X.F.Bai P.Q.Wang d.y.li X.Q.Jiang College of Engineering and Technology Southwest UniversityTiansheng Road 2Beibei DistrictChongqing 400715China department of Mechanical and Industrial Engineering Ryerson University350 Victoria StreetTorontoOntario M5B 2K3Canada School of Materials and Energy Southwest UniversityTiansheng Road 2Beibei DistrictChongqing 400715China department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

lightweight ZEK100-0 Mg alloy and A16022-T43 Al alloy with an Ag interlayer were joined via ultrasonic spot welding(USW),focusing on the microstructural change and tensile lap shear strength of the welded joints in relation to welding ***/Al interface was superseded by Mg/Ag and Al/Ag interfaces,and unfavorable Mg门A-intermetallic compound was *** foil was observed to be intact in the nugget center,while it was broken or dissolved at the nugget edge at high welding energy *** diffusion layer at the Mg/Ag interface consisted of two distinctive sub-layers:Mg3Ag intermetallic compound adjoining Ag foil,and Mg3Ag-l-Mg eutectic structure adjacent to *** a thin diffusion layer consisting mainly of Ag3Al occurred al lhe Al/Ag *** tensile lap shear strength first increased,reached its peak value,and then decreased with increasing welding *** shear strength achieved in the present study was〜31%higher than that of the joint without *** failure occurred at all energy levels,with Ag foil particles or fragments being stuck on both Mg and Al sides due to its intense interaction with Mg and Al via accelerated diffusion during *** results obtained pave the way for the challenging dissimilar welding between Mg and Al alloys.

关键词： Magnesium alloy Aluminum alloy Ultrasonic spot welding Ag interlayer Microstructure Tensile lap shear strength

Variations in Wear Resistance of a Novel Triboalloy Pseudoelastic TiNi Alloy-with Respect to its Pseudoelasticity and Hardness

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Journal of Materials Science & Technology 2001年第1期17卷 45-46页

作者： d.y.li and X.Ma dept. of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6 Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 2G6 Canada

It has recently been found that TiNt shape memory alloy has another attractive property; high resistance to wear. The wear resistance of this alloy benefits from its pseudoelasticity (PE). It has, however, been noticed that other mechanical properties also affect the wear resistance, especially the hardness. Research was conducted to investigate the correlation between the wear resistance and both the PE and hardness. It has been demonstrated that when the PE is high, lower hardness leads to higher wear resistance.

关键词： TiNi Variations in Wear Resistance of a Novel Triboalloy Pseudoelastic TiNi Alloy-with Respect to its Pseudoelasticity and Hardness

A Study on Solid/Melt Interfaces and the Formation of<100> Texture in Solidified FCC Metals

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Journal of Materials Science & Technology 1997年第6期13卷 457-461页

作者： d.y.li(dept. of Mater. Sci & Eng., The Pennsylvania State University, University Park, PA 16802, USA )B.debray and J.A.Szpunar(dept. of Metall. Eng., McGill University, 3450 Uuiversity Street, Molitreal, PQ, Canada H3A 2A7) dept. of Mater. Sci and Eng. Pennsylvania State University University Park PA 16802 United States dept. of Metall. Eng. McGill University Montreal PQ H3A 2A7 3450 University Street Canada

The (100) texture of solidified fcc metals, caused by the preferential (100) dendrite growth, could be closeIy related to solid/melt interfaces which behave differently along different crystallographic orientation. The stability and roughness of {111} and {100} solid/melt interfaces of fcc metals were investigated using a modified Temkin multi-layer model. It is demonstrated that {100}crystal/melt interface is more unstable and rougher than {111} interface. The effect of the stability of crystal/melt interface on the (100) texture formation in solidified fcc metals has been analysed and discussed.

关键词： FCC A Study on Solid/Melt Interfaces and the Formation of<100 Texture in Solidified FCC Metals

SyNTHESIS,CHARACTERISATION ANd PROPERTIES OF PURE ANd EPOXy-MOdIFIEd Bi(Pb)SrCaCuO SUPERCONdUCTORS

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SYNTHESIS,CHARACTERISATION AND PROPERTIES OF PURE AND EPOXY-...

Proton beams from intense laser-solid interaction:Effects of the target materials

94'全国结构陶瓷、功能陶瓷、金属/陶瓷封接学术会议

作者： I.M.LOW d.y.li H.Wang C.W.MacKinnon R.d.Skala R.L.davis Materials Research Group School of Physical Science Curtin University of Technology Australian Nuclear Science and Technology Organisation

INTROdUCTION The discovery of high temperature super conducting phases in the（Bi,Pb）-Sr-Ca-Cu -O system,represented by the nominal ideal formula（Bi,Pb）SrCaCu_nO（n=2,3） has attracted considerable attention because of the occurrence of bulk superconductivity for the（Bi,Pb）SrCaCuOx（2223） phase at a Tc above 110 K[1-7],However,limited knowledge on the *** of the（2223） phase still prevails,which may be attributed to the difficulty of preparing a pure single phase,and also to the

关键词： Pb)SrCaCuO SUPERCONdUCTORS SyNTHESIS,CHARACTERISATION ANd PROPERTIES OF PURE ANd EPOXy-MOdIFIEd Bi

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Matter and Radiation at Extremes 2020年第6期5卷 42-47页

作者： y.X.Geng d.Wu W.yu Z.M.Sheng S.Fritzsche Q.liao M.J.Wu X.H.Xu d.y.li W.J.Ma H.y.Lu y.y.Zhao X.T.He J.E.Chen C.lin X.Q.yan Key Laboratory of HEdP of the Ministry of Education CAPTand State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China Institute for Fusion Theory and Simulation Department of PhysicsZhejiang University310058 HangzhouChina State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics201800 ShanghaiChina SUPA department of Physics University of StrathclydeGlasgow G40NGUnited Kingdom Key Laboratory for Laser Plasmas(Ministry of Education) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Helmholtz Institut-Jena and Friedrich-Schiller-University D-07743 JenaGermany

We report systematic studies of laser-driven proton beams produced with micrometer-thick solid targets made of aluminum and plastic,*** effects of the target materials are found on the total charge,cutoff energy,and beam spot of protons in the experiments,and these are described well by two-dimensional particle-in-cell simulations incorporating intrinsic material *** is found that with a laser intensity of 8×10^(19) W/cm^(2),target normal sheath acceleration is the dominant mechanism for both types of *** a plastic target,the higher charge and cutoff energy of the protons are due to the greater energy coupling efficiencies from the intense laser beams,and the larger divergence angle of the protons is due to the deflection of hot electrons during transport in the *** also find that the energy loss of hot electrons in targets of different thickness has a significant effect on the proton cutoff *** consistent results obtained here further narrow the gap between simulations and experiments.

关键词： properties. intense solid

The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite

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Research in Astronomy and Astrophysics 2023年第9期23卷 66-78页

作者： Z.X.ling X.J.Sun C.Zhang S.L.Sun G.Jin S.N.Zhang X.F.Zhang J.B.Chang F.S.Chen y.F.Chen Z.W.Cheng W.Fu y.X.Han H.li J.F.li y.li Z.d.li P.R.liu y.H.Lv X.H.Ma y.J.Tang C.B.Wang R.J.Xie y.L.Xue A.L.yan Q.Zhang C.y.Bao H.B.Cai H.Q.Cheng C.Z.Cui y.F.dai d.W.Fan H.B.Hu J.W.Hu M.H.Huang Z.Q.Jia C.C.Jin d.y.li J.Q.li H.y.liu M.J.liu y.liu H.W.Pan y.L.Qiu M.Sugizaki H.Sun W.X.Wang y.L.Wang Q.y.Wu X.P.Xu y.F.Xu H.N.yang X.yang B.Zhang M.Zhang W.d.Zhang Z.Zhang d.H.Zhao X.Q.Cong B.W.Jiang L.H.li X.B.Qiu J.N.Sun d.T.Su J.Wang C.Wu Z.Xu X.M.yang S.K.Zhang Z.Zhang N.Zhang y.F.Zhu H.y.Ban X.Z.Bi Z.M.Cai W.Chen X.Chen y.H.Chen y.Cui X.L.duan Z.G Feng y.Gao J.W.He T.He J.J.Huang F.li J.S.li T.J.li T.T.li H.Q.liu L.liu R.liu S.liu N.Meng Q.Shi A.T.Sun y.M.Wang y.B.Wang H.C.Wu d.X Xu y.Q yang y.yang X.S.yu K.X.Zhang y.L.Zhang y.H.Zhang y.T.Zhang H.Zhou X.C.Zhu J.S.Cheng L.Qin L.Wang Q.L.Wang M.Bai R.L.Gao Z.Ji y.R.liu F.L.Ma y.J.Shi J.Su y.y.Tan J.Z.Tong H.T.Xu C.B.Xue G.F.Xue W.yuan National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Shanghai Institute of Technical Physics Chinese Academy of SciencesShanghai 200083China North Night Vision Technology Co. LTDNanjing 211106China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Science and Technology on Low-light-Level Night Vision Laboratory Xi'an 710065China Innovation Academy for Microsatellites Chinese Academy of SciencesShanghai 201204China Institute of Electrical Engineering Chinese Academy of ScienceBeijing 100190China National Space Science Center Chinese Academy of ScienceBeijing 100190China

The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 July *** this paper,we introduce the design and on-ground test results of the LEIA *** stateof-the-art Micro-Pore Optics(MPO),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is *** optical assembly composed of 36 MPO chips is used to focus incident X-ray photons,and four large-format complementary metal-oxide semiconductor(CMOS)sensors,each of size 6 cm×6 cm,are used as the focal plane *** instrument has an angular resolution of 4’-8’(in terms of FWHM)for the central focal spot of the point-spread function,and an effective area of 2-3 cm^(2) at 1 keV in essentially all the directions within the field of *** detection passband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10^(-11) erg s^(-1) cm^(-2)(about 1 milliCrab)with a 1000 s *** total weight of LEIA is 56 kg and the power is 85 *** satellite,with a design lifetime of 2 yr,operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 *** is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation,and by optimizing the working setups of the instrumental *** addition,LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available.

关键词： instrumentation detectors-space vehicles instruments-telescopes-X-rays genera