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Introduction of nanotwins into nanoprecipitations strengthened CoCrNiMo_(0.2) alloy to achieve strength and ductility trade-off:A comparative research

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Journal of Materials Science & Technology 2023年第25期156卷 172-182页

作者： Hao Zhang Ziyi Ren Yonggang Tong Yongle Hu Xixi Ji Lingwei Yang Kaiming Wang Jingzhong Fang Hui Chen Xiubing Liang College of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China School of Civil Engineering Changsha University of Science and TechnologyChangsha 410111China National Institute of Defense Technology Innovation Academy of Military Science PLA ChinaBeijing 100072China

Normal strengthening methods through precipitations and deformation obviously enhance the strength of metallic materials while resulting in the sacrifice of ductility,and synergistic improvement of strength and ductility is currently an urgent *** we developed a cryogenic deformation combined with an annealing method to fabricate CoCrNiMo_(0.2) medium entropy alloy,which achieved an ultrahigh strength of 1.8 GPa with synergistic improvement in strength and ***,mechanical performance,and strengthening mechanisms of the developed alloys were investigated compared with that prepared by the regular room temperature deformation *** was found that high-density nanotwins were produced in CoCrNiMo_(0.2) MEA via cryogenic *** grains,hard precipitations,and high volume fraction of nanotwins greatly strengthened the alloy,obtaining a yield and ultimate tensile strength of 1400 MPa and 1800 *** improvement of the developed alloy was mainly attributed to the production of deformation nanotwins due to the lower stacking fault energy,which greatly increases the dislocation storage ability,and thus,the ductility of the alloy was enhanced.

关键词： Nanotwins Mechanical properties Deformation behavior strengthening mechanisms

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Magnesium-based nanocomposites:A review from mechanical,creep and fatigue properties

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Journal of Magnesium and Alloys 2023年第8期11卷 2655-2687页

作者： S.Abazari A.Shamsipur H.R.Bakhsheshi-Rad J.W.Drelich J.Goldman S.Sharif A.F.Ismail M.Razzaghi Department of Materials and Metallurgical Engineering Amirkabir University of TechnologyTehranIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials Science and Engineering Michigan Technological UniversityHoughtonMI 49931USA Department of Biomedical Engineering Michigan Technological UniversityHoughtonMI 49931USA Advanced Manufacturing Research Group Faculty of Mechanical EngineeringUniversiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia Advanced Membrane Technology Research Center(AMTEC) Universiti Teknologi MalaysiaJohor Bahru 81310JohorMalaysia

The addition of nanoscale additions to magnesium(Mg)based alloys can boost mechanical characteristics without noticeably decreasing *** Mg is the lightest structural material,the Mg-based nanocomposites(NCs)with improved mechanical properties are appealing materials for lightweight structural *** contrast to conventional Mg-based composites,the incorporation of nano-sized reinforcing particles noticeably boosts the strength of Mg-based nanocomposites without significantly reducing the *** present article reviews Mg-based metal matrix nanocomposites(MMNCs)with metallic and ceramic additions,fabricated via both solid-based(sintering and powder metallurgy)and liquid-based(disintegrated melt deposition)*** also reviews strengthening models and mechanisms that have been proposed to explain the improved mechanical characteristics of Mg-based alloys and ***,synergistic strengthening mecha-nisms in Mg matrix nanocomposites and the dominant equations for quantitatively predicting mechanical properties are ***,this study offers an overview of the creep and fatigue behavior of Mg-based alloys and nanocomposites using both traditional(uniaxial)and depth-sensing indentation *** potential applications of magnesium-based alloys and nanocomposites are also surveyed.

关键词： Magnesium-based nanocomposites Nanoreinforcement strengthening mechanisms Creep properties Fatigue properties

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Combining gradient structure and supersaturated solid solution to achieve superior mechanical properties in WE43 magnesium alloy

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Journal of Materials Science & Technology 2022年第4期99卷 223-238页

作者： Wanting Sun Bo Wu Hui Fu Xu-Sheng Yang Xiaoguang Qiao Mingyi Zheng Yang He Jian Lu San-Qiang Shi State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HomHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute ShenzhenChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomHong KongChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Centre for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China Department of Mechanical Engineering City University of Hong KongKowloonHong KongChina

In this study,surface mechanical attrition treatment was employed to sucessfully produce a gradient nanostructured layer on WE43 magnesium alloy.X-ray diffraction,energy dispersive X-ray spectrometer,and high-resolution transmission electron microscope observations were mainly performed to uncover the microstructure evolution responsible for the refinement *** reveals that the grain refinement process consists of three transition stages along the depth direction from the core matrix to the topmost surface layer,i.e.,dislocation cells and pile-ups,ultrafine subgrains,and randomly orientated nanograins with the grain size of~40 ***,the original Mg;RE second phase is also experienced refinement and then re-dissolved into the α-Mg matrix phase,forming a supersaturated solid solution nanostructuredα-Mg phase in the gradient refined *** to the cooperative effects of grain refinement hardening,dislocation hardening,and supersaturated solid-solution hardening,the gradient nanostructured WE43 alloy contributes to the ultimate tensile strength of~435 MPa and ductility of~11.0%,showing an extraordinary strain hardening and mechanical properties among the reported severe plastic deformation-processed Mg *** work provides a new strategy for the optimization of mechanical properties of Mg alloys via combining the gradient structure and supersaturated solid solution.

关键词： Mg-RE alloy Surface mechanical attrition treatment Gradient nanostructure Supersaturated solid solution High strength and ductility strengthening mechanisms

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Effect of Mn content on microstructure and properties of AlCrCuFeMnx high-entropy alloy

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China Foundry 2024年第2期21卷 147-158页

作者： Ning Wang Kai Ma Qiu-da Li Yu-dong Yuan Yan-chun Zhao Li Feng School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Reuse of Nonferrous Metals Lanzhou 730050China CNNC Nuclear Power Operation and Management Co. Ltd.Haiyan 314300ZhejiangChina

AlCrCuFeMnx(x=0,0.5,1,1.5,and 2)high-entropy alloys were prepared using the vacuum arc melting *** microstructure and mechanical properties of AlCrCuFeMnxwere analyzed and tested by XRD,SEM,TEM,nanoindentation,and electronic universal *** results indicate that the AlCrCuFeMnxhigh-entropy alloy exhibits a dendritic structure,consisting of dendrites with a BCC structure,interdendrite regions with an FCC structure,and precipitates with an ordered BCC structure that form within the ***(Mn)has a strong affinity for dendritic,interdendritic,and precipitate structures,allowing it to easily enter these *** an increase in Mn content,the size of the precipitated nanoparticles in the dendritic region initially increases and then ***,the area fraction initially decreases and then ***,the alloy’s strength and wear resistance decrease,while its plasticity *** Al Cr Cu Fe Mn1.5alloy boasts excellent mechanical properties,including a hardness of 360 HV and a wear rate of 2.4×10^(-5)mm^(3)·N^(-1)·mm^(-1).It also exhibits impressive yield strength,compressive strength,and deformation rates of 960 MPa,1,700 MPa,and 27.5%,respectively.

关键词： high-entropy alloys microstructure mechanical properties wear resistance strengthening mechanisms

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Current progress of research on heat -resistant Mg alloys: A review

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1406-1425页

作者： Hong Yang Wenlong Xie Jiangfeng Song Zhihua Dong Yuyang Gao Bin Jiang Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

With the increasing attention received by lightweight metals,numerous essential fields have increased requirements for mag-nesium(Mg)alloys with good room-temperature and high-temperature mechanical ***,the high-temperature mechanic-al properties of commonly used commercial Mg alloys,such as AZ91D,deteriorate considerably with increasing *** the past several decades,extensive efforts have been devoted to developing heat-resistant Mg *** approaches either inhibit the gen-eration of thermally unstable phases or promote the formation of thermally stable precipitates/phases in matrices through solid solution or precipitation *** this review,numerous studies are systematically introduced and *** alloy systems,includ-ing those based on Mg–Al,Mg–Zn,and Mg–rare earth,are carefully classified and compared to reveal their mechanical properties and strengthening *** emphasis,limitations,and future prospects of these heat-resistant Mg alloys are also pointed out and dis-cussed to develop heat-resistant Mg alloys and broaden their potential application areas in the future.

关键词： magnesium alloys mechanical properties heat resistance microstructures high temperatures strengthening mechanisms

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Microstructure and mechanical properties of Mg-3Sn-1Ca reinforced with AlN nano-particles

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Journal of Magnesium and Alloys 2023年第1期11卷 259-269页

作者： Shaozhu Wang Yuanding Huang Lixiang Yang Ying Zeng Yaozeng Hu Xiao Zhang Qiang Sun Shaojun Shi Guangyao Meng Norbert Hort School of Mechanical&Automotive Engineering Qingdao University of TechnologyTsingtao 266520PR China MagIC-Magnesium Innovation Center Helmholtz-Zentrum GeesthachtMax-Planck-Strasse 1Geesthacht 21502Germany Linyi Institute of Industrial Technology Linyi 276000PR China Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240PR China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031PR China Shandong Yinguang Yuyuan Light Metal Precise Forming Co. LtdShandong 273400PR China

Microstructural evolution and strengthening mechanisms of Mg-3Sn-1Ca based alloys with additions of different amounts of Al N nanoparticles were *** was found that with increasing the amount of AlN nano-particles the grain size decreases *** existence of AlN nano-particles could refine the primary crystal phases CaMgSn,which provided more heterogeneous nucleation sites for the formation of ***,such nano-particles could also restrict the grain growth during *** adding AlN nano-particles,both the tensile properties at room temperature and high temperature 250℃and the hardness are largely *** improvement of strength is attributed to grain refinement and second phase refinement.

关键词： Mg-Sn-Ca alloy AlN nano-particles Microstructure strengthening mechanisms Grain refinement

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Microstructure and Properties of Micro-Alloyed Mg-2.0Nd-0.2Sr by Heat Treatment and Extrusion

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 323-334页

作者： Zhenzhen Gui Fan Jiang Zhixin Kang Fan Zhang Zu Li Jianhui Zhang School of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou510006China Joint Institute of Guangzhou University and Institute of Corrosion Science and Technology Guangzhou UniversityGuangzhou510006China Guangdong Key Laboratory for Advanced Metallic Materials Processing School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640China

Magnesium(Mg)and its alloys have broad application prospects in the fields such as biomedical materials and automobile manufacturing.A micro-alloyed Mg-2.0Nd-0.2Sr(wt.%)magnesium alloy is designed and obtained through semicontinuous *** evolution of microstructures and tensile properties are investigated with different heat treatments and extrusion *** grain sizes decrease significantly after extrusion,thus changing the fracture mode during the tensile testing *** ultimate tensile strength(UTS),yield strength(YS)and elongation(EL)of the properly processed extrusion alloy(referred to as MNS-E2)reach to 247 MPa,228 MPa and 24%,*** dramatical improvement of mechanical properties results from the refined grains and interactions between dislocations and *** nanoparticle bands blocking the slippage and movement of dislocations are also found in the MNS-E2 *** above causes combined result in an integrated effect of grain boundary strengthening,dislocation strengthening,precipitation strengthening and nanoparticle band *** contribution of strengthening mechanisms of MNS-E2 alloy consists of grain boundary with around 96 MPa,dislocations with around 3.4 MPa,precipitation strengthening with around 45 MPa and the nanoparticle band with around 18 MPa,respectively.

关键词： Mg-Nd-Sr alloy Hot extrusion Mechanical properties strengthening mechanisms

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Designing ultrastrong maraging stainless steels with improved uniform plastic strain via controlled precipitation of coherent nanoparticles

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Journal of Materials Science & Technology 2021年第34期93卷 60-70页

作者： Z.H.Wang B.Niu Q.Wang C.Dong J.C.Jie T.M.Wang T.G.Nieh Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Department of Materials Science and Engineering The University of TennesseeKnoxville37996TennesseeUSA

The development of ultrastrong maraging stainless steels(MSSs)is always in high ***,traditional high-strength MSSs generally exhibit early plastic instability with a low uniform strain since the precipitated nanoparticles are non-coherent with the body-centered-cubic(BCC)lath martensitic ***,we design a novel ultrahigh strength MSS(Fe-5.30 Cr-13.47 Ni-3.10 Al-1.22 Mo-0.50 W-0.23 Nb-0.03 C-0.005 B,wt.%)using a cluster formula approach.A fabulous microstructure consisting of a uniform distribution of high-density coherent B2-Ni Al nanoprecipitates(3-5 nm)in BCC martensitic matrix was successfully *** alloy has not only an exceedingly high ultimate tensile strength of 2.0 GPa,but also a decent uniform elongation of 4.2%-5.1%,which is almost triple of the value observed in existing *** present an in-depth discussion on the origins of ultrahigh strength and uniform plastic strain in the new alloy to validate our design strategy and further offer a new pathway to exploit highperformance MSSs.

关键词： Maraging stainless steel Ultrahigh strength Coherent precipitation strengthening mechanisms Uniform deformation

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Effect of Particle Size on Mechanical Properties and Fracture Behaviors of Age-Hardening SiC/Al–Zn–Mg–Cu Composites

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Acta Metallurgica Sinica(English Letters) 2021年第10期34卷 1447-1459页

作者： Guonan Ma Dong Wang Bolv Xiao Zongyi Ma Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

15 vol.% SiC/Al-6.5Zn-2.8 Mg-1.7 Cu(wt%) composites with varying particle sizes(3.5, 7.0, 14 and 20 μm), i.e., C-3.5, C-7.0, C-14, and C-20, respectively, were fabricated by powder metallurgy(PM) method and subjected to microstructural examination. The effect of particle size on mechanical properties and fracture behaviors of the T6-treated composites was revealed and analyzed in detail. Element distribution and precipitates variations in the composites with varying particle sizes were emphatically considered. Results indicated that both tensile strength and plasticity of the T6-treated composites increased first and then decreased with particle size decreasing. The C-7.0 composite simultaneously exhibited the highest ultimate tensile strength(UTS) of 686 MPa and best elongation(El.) of 3.1%. The smaller-sized SiC particle would introduce more oxide impurities, which would react with the alloying element in the matrix to cause Mg segregation and depletion. According to strengthening mechanism analysis, the weakening of precipitation strengthening in the T6-treated C-3.5 composite was the main cause of the lower tensile strength. Additionally, the larger SiC particle, the more likely to fracture, especially in the composites with high yield strength. For the T6-treated C-20 composites, more than 75% SiC particles were broken up, resulting in the lowest plasticity. As decreasing particle size, the fracture behaviors of the T6-treated composites would change from particle fracture to matrix alloy fracture gradually.

关键词： Metal matrix composites Mechanical properties Particle size Fracture behaviors strengthening mechanisms

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Deformation induced hcp nano-lamella and its size effect on the strengthening in a CoCrNi medium-entropy alloy

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Journal of Materials Science & Technology 2021年第23期82卷 122-134页

作者： Yan Ma Muxin Yang Fuping Yuan Xiaolei Wu State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesNo.15West RoadNorth 4th RingBeijing100190China School of Engineering Science University of Chinese Academy of SciencesNo.19(A)Yuquan RoadShijingshan DistrictBeijing100049China

Deformation-induced hcp nano-lamellae with various widths and interspacings were observed in the Co Cr Ni medium-entropy alloy(MEA)under high strain rate and cryogenic temperature in the present *** hardness was found in the cryogenic-deformed samples compared to the room temperature-deformed samples without hcp ***,size effects of embedded hcp nano-lamellae on the tensile behaviors in the fcc Co Cr Ni MEA were investigated by molecular dynamics *** overall strengthening was found to have two components:phase strengthening and extra interface strengthening,and the interface strengthening was observed to be always stronger than the phase *** overall strengthening and interface strengthening were found to increase with increasing width and decreasing interspacing of embedded hcp *** samples with small spaced hcp nano-lamellae are even stronger than the pure hard hcp phase due to the extra interface *** samples with larger width of embedded hcp nano-lamellae can provide stronger resistance for dislocation slip and *** were observed to be formed in the embedded hcp *** density of phase boundaries and newly formed twin boundaries can provide more barriers for dislocation glide in the other slip systems,resulting in higher strength for samples with smaller interspacing.

关键词： strengthening mechanisms Phase transformation Twinning Medium entropy alloys Molecular dynamics simulations

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