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Journal of Materials Science & Technology 2022年第14期109卷 186-196页

作者： H.R.peng z.y.Jian C.X.Liu L.K.Huang y.M.Ren F.Liu School of Materials and Chemical Engineering Xi’an Technological UniversityXi’an 710021China State Key Laboratory of Solidification processing Northwestern Polytechnical UniversityXi’an 710072China

The strength of polycrystalline metals increases with decreasing grain size,following the classical Hallpetch ***,this relationship fails when softening occurs at very small grain sizes(typically less than 10 to 20 nm),which limits the development of ultrahigh-strength *** this work,using columnar-grained nanocrystalline Cu-Ag‘samples’,molecular dynamics simulations were performed to investigate the softening mechanism and explore the strengthening strategies(e.g.,formation of solid solution or grain boundary(GB)segregation)in extremely fine nanograined ***,the softening of pure metals is induced by atomic sliding in the GB layer,rather than dislocation activities in the grain interior,although both occur during *** solid solution lowers the stacking fault energy and increases the GB energy,which leads to the softening of NC *** segregation stabilizes GB structures,which causes a notable improvement in strength,and this improvement can be further enhanced by optimizing the solute concentration and GB *** work deepens the understanding of the softening mechanism due to atomic sliding in the GB layer and the strengthening mechanism arising from tailoring the GB stability of immiscible alloys and provides insights into the design of ultrahighstrength materials.

关键词： Softening Strengthening Cu-Ag alloy Molecular dynamics Nanocrystalline

Unusually high corrosion resistance in Mo_(x)CrNiCo medium entropy alloy enhanced by acidity in aqueous solution

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Journal of Materials Science & Technology 2023年第8期139卷 59-68页

作者： S.Shuang G.J.Lyu D.Chung X.z.Wang X.Gao H.H.Mao W.p.Li Q.F.He B.S.Guo X.y.zhong y.J.Wang y.yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 101408China State Key Laboratory of Solidification processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Unit of Structures Department of Materials Science and EngineeringKTHStockholm SE-10044Sweden Thermo-Calc Software Råsundav.18SolnaSE-16767Sweden Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhou 510632China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina

High corrosion resistance of alloys is essential for their structural applications;however,most alloys suffer from degradation of their corrosion resistance with the increasing acidity of their ***,we developed a series of medium-entropy alloys(MEAs)in this work,which ex-hibit high strength,superior fracture toughness and ultra-high corrosion resistance,outperforming the variety of corrosion resistant alloys hitherto *** interestingly,our MEAs exhibit an unusual anti-corrosion behavior and their corrosion resistance increases with acidity in Cl−containing *** extensive thermodynamic calculations,density functional theory(DFT)simulations and experi-ments,we reveal that the unusual anti-corrosion behavior of our MEAs can be attributed to their surface chemical complexity,which facilitates the physio-chemical-absorption of H_(2)O and O_(2)and thus the rapid formation of metastable medium entropy passive films that contain the lowest amount of defects,as compared to the passive films on conventional alloys reported in the literature.

关键词： Corrosion passivation Alloy design Multi-principal element alloys Medium-entropy alloys

High throughput synthesis enabled exploration of CoCrFeNi-based high entropy alloys

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Journal of Materials Science & Technology 2022年第15期110卷 269-282页

作者： L.zhao L.Jiang L.X.yang H.Wang W.y.zhang G.y.Ji X.zhou W.A.Curtin X.B.Chen p.K.Liaw S.y.Chen H.z.Wang Beijing Advanced innovation Center for Materials Genome Engineering Beijing Key Laboratory of Metal Materials CharacterizationCentral Iron and Steel Research InstituteBeijing 100081China institute for Advance Studies in precision Materials Yantai UniversityYantai 264005China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Laboratory for Multiscale Mechanics Modeling Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland School of Engineering RMIT UniversityMelbourne 3046Australia Department of Materials Science and Engineering The University of Tennessee37996USA

To accelerate the exploration,screening,and discovery of structural high-entropy alloys with targeted properties,the newly developed High-Throughput Hot-isostatic-pressing based Micro-Synthesis Approach(HT-Hip-MSA)is employed to efficiently synthesize and characterize 85 combinatorial alloys in a 13-principal element alloying *** Co Cr Fe Ni-based high entropy alloys span 1 quaternary,9 quinary,and 36 senary alloy systems,and their composition-structure-property relationships are characterized and analyzed experimentally and *** the single-phase FCC CoCrFeNi alloy base,with Mn,Cu,Ti,Nb,Ta,Mo,W,Al,and Si as principal element alloying additions,we find(1)the extended Mn solubility in the single-phase FCC CoCrFeNi-Mn_(x) alloys,(2)the destabilizing behavior for most of the quinary and senary alloys,and(3)the distinctive solid-solution-strengthening effects in the *** combining the computational methods,the HT-Hip-MSA can be systematic and economic to explore and refine the compositions,structures,and properties of structural high-entropy alloys.

关键词： High-entropy alloys High-throughput Composition-structure-property

Recent development of chemically complex metallic glasses: from accelerated compositional design, additive manufacturing to novel applications

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Materials Futures 2022年第1期1卷 9-31页

作者： J y zhang z Q zhou z B zhang M H park Q yu z Li J Ma A D Wang H G Huang M Song B S Guo Q Wang y yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Shenzhen Key Laboratory of High performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhenGuangdong 518060People’s Republic of China School of Materials Science and Engineering Dongguan University of TechnologyDongguanGuangdong 523808People’s Republic of China institute of Materials China Academy of Engineering PhysicsJiangyouSichuan 621907People’s Republic of China State Key Laboratory of powder Metallurgy Central South UniversityChangshaHunan 410083People’s Republic of China institute of Advanced Wear&Corrosion Resistant and Functional Materials Jinan UniversityGuangzhouGuangdong 510632People’s Republic of China institute of Materials Laboratory for MicrostructuresShanghai UniversityShanghai 200444People’s Republic of China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China

Metallic glasses(MGs)or amorphous alloys are an important engineering material that has a history of research of about 80–90 *** different fast cooling methods were developed for multi-component MGs between 1960s and 1980s,1990s witnessed a surge of research interest in the development of bulk metallic glasses(BGMs).Since then,one central theme of research in the metallic-glass community has been compositional design that aims to search for MGs with a better glass forming ability,a larger size and/or more interesting properties,which can hence meet the demands from more important *** this review article,we focus on the recent development of chemically complex MGs,such as high entropy MGs,with new tools that were not available or mature yet until recently,such as the state-of-the-art additive manufacturing technologies,high throughput materials design techniques and the methods for big data analyses(*** learning and artificial intelligence).We also discuss the recent use of MGs in a variety of novel and important applications,from personal healthcare,electric energy transfer to nuclear energy that plays a pivotal role in the battle against global warming.

关键词： metallic glasses amorphous alloys alloy design additive manufacturing machine learning high throughput materials design

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新一代基因编辑工具无须蛋白核酸酶参与

张江科技评论 2024年第1期 126-126页

作者： LiU z X zHANG S y zHU H z 戴川

创新点,基因承载着遗传信息,塑造了生命的多样性和复杂性。基因编辑作为一项关键技术,在生物学研究和生物医药产业的发展中具有至关重要的地位,是我们深入了解和改变生命的关键工具。历代基因编辑工具,zFNs、TALENs、CRiSpR-Cas均高度... 详细信息

创新点,基因承载着遗传信息,塑造了生命的多样性和复杂性。基因编辑作为一项关键技术,在生物学研究和生物医药产业的发展中具有至关重要的地位,是我们深入了解和改变生命的关键工具。历代基因编辑工具,zFNs、TALENs、CRiSpR-Cas均高度依赖蛋白质。

关键词：基因编辑生物医药产业遗传信息核酸酶深入了解生命多样性蛋白质

Surgical outcomes and quality of life following exercise-based prehabilitation for hepato-pancreatico-biliary surgery:A systematic review and meta-analysis

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Hepatobiliary & pancreatic Diseases international 2022年第3期21卷 207-217页

作者： Andy Deprato Kevin Verhoeff Kieran purich Janice y Kung David L Bigam Khaled z Dajani University of Alberta 116 St&85 AveEdmontonAlberta T6G 2R3Canada Department of Surgery University of Alberta Hospital8440112 Street NWEdmontonAlberta T6G 2B7Canada John W.Scott Health Sciences Library University of Alberta Hospital8440112 Street NWEdmontonAlberta T6G 2B7Canada Department of Surgery Division of General SurgeryHPB Transplant and OncologyUniversity of Alberta Hospital8440112 Street NWEdmontonAlberta T6G 2B7Canada

Background:Hepato-pancreatico-biliary(HpB)patients experience significant risk of preoperative *** assessing preventative prehabilitation in HpB populations are *** systematic review and meta-analysis evaluates outcomes for HpB patients treated with exercise *** sources:A comprehensive search of MEDLiNE(via Ovid),Embase(Ovid),Scopus,Web of Science Core Collection,Cochrane Library(Wiley),pro Quest Dissertations,Theses Global,and Google Scholar was conducted with review and extraction following pRiSMA *** studies evaluated more than 5 adult HpB patients undergoing≥7-day exercise *** primary outcome was postoperative length of stay(LOS);secondary outcomes included complications,mortality,physical performance,and quality of ***:We evaluated 1778 titles and abstracts and selected 6(randomized controlled trial,n=3;prospective cohort,n=1;retrospective cohort,n=2)that included 957 *** those,536 patients(56.0%)underwent exercise prehabilitation and 421(44.0%)received standard *** in both groups were similar with regards to important demographic *** was associated with a 5.20-day LOS reduction(p=0.03);when outliers were removed,LOS reduction decreased to 1.85 days and was non-statistically significant(p=0.34).postoperative complications(OR=0.70;95%Ci:0.39 to 1.26;p=0.23),major complications(OR=0.83;95%Ci:0.60 to 1.14;p=0.24),and mortality(OR=0.67;95%Ci:0.17 to 2.70;p=0.57)were *** was associated with improved strength,cardiopulmonary function,quality of life,and alleviated ***:Exercise prehabilitation may reduce LOS and morbidity following HpB *** with well-defined exercise regimens are needed to optimize exercise prehabilitation outcomes.

关键词： Exercise-based prehabilitation preoperative exercise Hepatobiliary pancreaticoduodenectomy Hepatic resection pancreatectomy

On ϕ-( n,N )-ideals of Commutative Rings

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代数集刊:英文版 2023年第3期30卷 481-492页

作者： Adam Anebri Najib Mahdou Ünsal Tekir Eda yıldız Laboratory of Modelling and Mathematical Structures Department of MathematicsFaculty of Science and Technology of FezBox 2202University S.M.Ben Abdellah FezMorocco Department of Mathematics Marmara UniversityIstanbulTurkey Department of Mathematics Yildiz Technical University34220IstanbulTurkey

Let R be a commutative ring with nonzero identity and n be a positive *** this paper,we introduce and investigate a new subclass ofϕ-n-absorbing primary ideals,which are calledϕ-(n,N)-***ϕ:i(R)→i(R)∪{∅}be a function,where i(R)denotes the set of all ideals of R.A proper ideal i of R is called aϕ-(n,N)-ideal if x1⋯xn+1∈i\ϕ(R)and x1⋯xn∉i imply that the product of xn+1 with(n−1)of x1,…,xn is in 0–√for all x1,…,xn+1∈*** addition to giving many properties ofϕ-(n,N)-ideals,we also use the concept ofϕ-(n,N)-ideals to characterize rings that have only finitely many minimal prime ideals.

关键词： Φ-(n N)-ideal Φ-n-absorbing primary ideal Φ-n-absorbing ideal Φ-prime

Hardening and toughening effects of intermediate nanosized structures in a confined amorphous alloy film

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Journal of Materials Science & Technology 2022年第23期118卷 44-53页

作者： z.Q.Chen M.C.Li X.Tong y.zhao J.y.Xie S.W.Guo p.Huang F.Wang H.B.Ke B.A.Sun W.H.Wang Songshan Lake Materials Laboratory Dongguan 523808China institute of physics Chinese Academy of SciencesBeijing 100190China Xinjiang Key Laboratory of Solid State physics and Devices and School of physical Science and Technology Xinjiang UniversityXinjiangUrumqi 830046China Key Laboratory of LCR Materials and Devices of yunnan province School of Materials and EnergyYunnan UniversityKunming 650091China State-Key Laboratory for Mechanical Behavior of Material Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an 710049China National Demonstration Center for Experimental Mechanics Education Xi’an Jiaotong UniversityXi’an 710049China

The plastic deformation of amorphous alloys is well known to be localized into shear bands(SBs),which are believed to stem from the atomic-scale flow defects,i.e.,shear transformation zones(STzs).yet,the bridge between the mesoscopic SBs and the atomic-scale STzs remains poorly *** this work,through thermally activating pronouncedβrelaxations in the well-designed crystalline-layer confined amorphous(CLCA)Ni W alloy films,we experimentally captured and observed an intermediate nanosized structure termed as“nano shear bands”(NSBs)with a typical size of 1–2 nm in thickness and5–10 nm in *** influences of such NSB structures on the macroscale deformation behavior were systematically *** was found that NSBs lead to both hardening and toughening effects for the CLCA films,as they promote multiple and controlled shear banding deformation,which results in enhanced *** intermediate NSB structure could connect the microstructural characteristics and macroscopic plasticity in amorphous alloys and may provide new insights for understanding the microscopic deformation mechanism of amorphous alloys as well as tuning/designing their properties.

关键词： Amorphous alloys Nano shear band Hardening Toughening Crystallization

Achieving superior mechanical properties of selective laser melted AlSi10Mg via direct aging treatment

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Journal of Materials Science & Technology 2022年第13期108卷 226-235页

作者： H.zhang y.Wang J.J.Wang D.R.Ni D.Wang B.L.Xiao z.y.Ma Shi-changxu innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China College of Materials Science and Engineering Shenyang Aerospace University37 Daoyi South AvenueShenyang 110136China

For additive manufactured aluminum alloys,the inferior mechanical properties along the building direction have been a serious *** this study,an optimized heat treatment was developed as a simple and effective *** effects of direct aging on microstructure and mechanical properties along the building direction of AlSi10Mg samples produced via selective laser melting(SLM)were *** results showed that,compared with the conventional heat treatment at elevated temperatures,direct aging at temperatures of 130-190℃ could retain the fine grain microstructure of SLM samples and promote further precipitation of Si phase,however,the growth of pores occurred during direct *** increasing aging temperature,while finer cell structures were obtained,more and larger pores were developed,resulting in decreased density of the *** types of pore formation mechanisms were *** the balance between the refinement of cell structure and the growth of pores,aging at 130℃ was determined as the optimized heat treatment for SLM AlSi10Mg *** tensile strength along the building direction of the 130℃ aged sample was increased from 403 Mpa to 451 Mpa,with relatively high elongation of 6.5%.

关键词： Additive manufacturing Selective laser melting AlSi10Mg alloy,Heat treatment

Derimorphisms over Algebras and Applications

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代数集刊:英文版 2023年第2期30卷 193-204页

作者： X.Cao S.H.Liu X.S.Lu z.J.ye z.R.yu y.H.zhang School of Mathematical Sciences Shanghai Jiao Tong University 800 Dongchuan RoadShanghai 200240China MoE Key Lab of Scientific and Engineering Computing Shanghai Jiao Tong University 800 Dongchuan RoadShanghai 200240China

The new concept"derimorphism"generalizing both derivation and homomor-phism is *** a derimorphism is invertible,its inverse is a Rota-Baxter *** general theory of derimorphism is *** classification of all derimorphisms over an associative unital algebra is *** to the nonexistence of nontriv-ial positive derivations,it is shown that nontrivial positive derimorphisms do exist over any pair of opposite orderings over R[x],the lattice-ordered full matrix algebra and upper triangular matrix algebra over a totally ordered field.

关键词： derimorphism Rota-Baxter operator opposite orderings positive derimor-phism