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A superior strength-ductility synergy of Al_(0.1)CrFeCoNi high-entropy alloy with fully recrystallized ultrafine grains and annealing twins

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Journal of Materials Science & Technology 2022年第36期131卷 185-194页

作者： Jiahao Li Kejie Lu Xiaojun Zhao Xinkai Ma Fuguo Li Hongbo Pan Jieming Chen Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Shenzhen Institute of Southwest Jiaotong University Shenzhen 518000China State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Anhui Province Key Laboratory of Metallurgical Engineering&Resources Recycling(Anhui University of Technology) 243002 MaanshanChina Luoyang Ship Material Research Institute Luoyang 471023China

Grain refinement usually makes the materials stronger,while ductility has a dramatic loss.Here,a superior tensile strength–ductility synergy in a fully recrystallized ultrafine-grained(UFG)Al_(0.1)CrFeCoNi with abundant annealing twins was achieved by cold rolling at room temperature and short-time annealing.The microstructure characterization using electron backscattered scattering diffraction demonstrates that abundant geometrically necessary dislocations(GNDs)gather around the grain boundaries and twin boundaries after tensile deformation.Although coarse-grained(CG)samples undergo a larger plastic deformation than UFG samples,the GND density decreases with grain size ranging from UFG to CG.Transmission electron microscopy results reveal that the annealing twin boundary,which effectively hinders the dislocation slip and stores dislocation in grain interior,and the activation of multiple deformation twins are responsible for the superior strength–ductility synergy and work hardening ability.In addition,the yield strength of fully recrystallized Al_(0.1)CrFeCoNi follows a Hall–Petch relationship(σ_y=24+676d^(–1/2)),where d takes into account both grain boundaries and annealing twin boundaries.The strengthening effects of grain boundaries and annealing twin boundaries were also evaluated separately.

关键词： High-entropy alloy ultrafine grains Annealing twins Strength Ductility

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Annealing hardening effect aroused by solute segregation in gradient ultrafine-grained Mg-Gd-Zr alloy

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Journal of Materials Science & Technology 2023年第13期144卷 70-80页

作者： Chunquan Liu Xianhua Chen Domonkos Tolnai Yaobo Hu Wei Zhang Yusheng Zhang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400045China National Engineering Research Centre for Magnesium Alloys Chongqing UniversityChongqing 400045China Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck Street 1Geesthacht 21502Germany Northwest Institute for Nonferrous Metal Research Xi’an 710016China

In this study,a remarkable annealing hardening effect was detected in gradient ultrafine-grained(UFG)Mg-0.32Gd-0.11Zr(at.%)alloy sheet fabricated by sliding friction treatment(SFT).Under the precipitation-free condition,the annealed UFG structure shows an obvious hardness increment from 1.40 GPa to 1.89 GPa after 200℃ heating for 12 h,which exhibits a much higher hardening response than the annealed coarse-grained(CG)structure.The high-angle annular dark-field scanning transmission elec-tron microscopy(HAADF-STEM)and elemental mapping reveal prominent segregation of solute Gd atoms along grain boundaries,which endows the UFG structure with excellent grain boundary stability.More-over,Gd segregation is also found around the extrinsic stacking fault(E-SFs)and the low-angle grain boundaries composed of edge dislocations.The large-scale solute partitioning provides a significant seg-regation hardening effect,which completely resists the softening effect aroused by the grain coarsening and dislocation annihilation.This work realizes a good combination of surface mechanical processing for fabricating UFGs and subsequent heat treatment,which earns desirable segregation hardening effects.

关键词： ultrafine grains Segregation Annealing hardening

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Laser directed energy deposited, ultrafine-grained functional titanium-copper alloys tailored for marine environments: Antibacterial and anti-microbial corrosion studies

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Journal of Materials Science & Technology 2023年第35期166卷 21-33页

作者： Jiaqi Li Duyao Zhang Xiaobo Chen Dake Xu Dong Qiu Fuhui Wang Mark Easton Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China School of Engineering Centre for Additive ManufacturingRMIT UniversityMelbourneVIC 3000Australia

The microorganism-rich nature of the ocean imposes great challenges to the structural integrity of met-als over their service lifespan,including titanium(Ti)alloys,which are usually prone to microbiologically influenced corrosion(MIC).So,multifunctional anti-MIC Ti alloys need to be developed and studied.This paper investigates the effect of copper(Cu)concentration on the MIC resistance of a series of additively manufactured,ultrafine-grained Ti-x Cu(x=3.5,6.5 and 8.5 in wt.%)alloys.The dependence of the cor-rosion resistance and MIC resistance on the Cu concentration of Ti-Cu alloy is interpreted considering all conceivable mechanisms.The mechanisms for excellent corrosion resistance of Ti-Cu alloy in seawater are attributed to the strong passive film and small surface potential difference between phases.Microstruc-tural characterization reveals that uniformly distributed,nanosized Ti_(2) Cu phase led to increased reactive oxygen species in the bacterial membrane,which is the root reason for the superb anti-bacterial property(99.2%)for Ti-8.5Cu.Compared to pure Ti and Ti-6Al-4V,Ti-8.5Cu alloy features both high strength(yield stress>1000 MPa)and the best MIC resistance(97.5%).The combination of such balanced properties enables this functional 3D printed Ti-Cu alloy to become an ideal material for load-bearing applications in the marine environment.

关键词： Multifunctional titanium alloys Additive manufacturing ultrafine grains Microbiologically influenced corrosion resistance Mechanical property Antibacterial property

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Improved Corrosion Resistance of ultrafine-Grained Mg-Gd-Zr Alloy Fabricated by Surface Friction Treatment

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金属学报:英文版 2023年第8期36卷 1281-1291页

作者： Chunquan Liu Xianhua Chen Yulong Wu Yaobo Hu Wei Zhang Yusheng Zhang Jingying Bai Fusheng Pan International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400045China National Engineering Research Centre for Magnesium Alloys Chongqing UniversityChongqing400045China Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Street 121502GeesthachtGermany Northwest Institute for Nonferrous Metal Research Xi’an710016China Beijing Spacecraft China Academy of Space TechnologyBeijing100194China

Gradient ultrafine-grained (UFG) Mg-2Gd-0.4Zr (wt%) alloy sheet, with a UFG layer of about 118 nm on the topmost treated surface, was fabricated by sliding friction treatment (SFT). The corrosion resistance of the SFT-processed UFG surface layer was greatly improved compared to the original coarse-grained (CG) structure, representing as a higher impedance and a lower corrosion rate (CG: 4.11 mm y^(−1), UFG: 2.71 mm y^(−1)). The UFG layer with high density of grain boundaries exhibits an excellent impeditive effect on the cracking of corrosion product films. Compared to the CG sample, the stable corrosion product film inhibits the formation of pitting so providing a better protective effect. In addition, the Gd-rich clusters are randomly distributed after SFT processing, which decreases the tendency of galvanic corrosion on the UFG surface.

关键词： ultrafine grains Mg-Gd-Zr alloy Corrosion resistance

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Effect of long-period stacking ordered structure on very high cycle fatigue properties of Mg-Gd-Y-Zn-Zr alloys

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Journal of Magnesium and Alloys 2023年第8期11卷 2811-2822页

作者： Xiangyu WANG Chao HE Xue Li Lang LI Yongjie LIU Qingyuan WANG Key Laboratory of Deep Earth Science and Engineering Ministry of EducationCollege of Architecture and EnvironmentSichuan UniversityChengdu 610065China Failure Mechanics&Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China

Magnesium alloys with a long-period stacking ordered(LPSO)structure usually possess excellent static strength,but their fatigue behaviors are poorly understood.This work presents the effect of the LPSO structure on the crack behaviors of Mg alloys in a very high cycle fatigue(VHCF)regime.The LPSO lamellas lead to a facet-like cracking process along the basal planes at the crack initiation site and strongly prohibit the early crack propagation by deflecting the growth direction.The stress intensity factor at the periphery of the faceted area is much higher than the conventional LPSO-free Mg alloys,contributing higher fatigue crack propagation threshold of LPSO-containing Mg alloys.Microstructure observation at the facets reveals a layer of ultrafine grains at the fracture surface due to the cyclic contact of the crack surface,which supports the numerous cyclic pressing model describing the VHCF crack initiation behavior.

关键词： Fatigue crack initiation Long-period stacking ordered structure Mg alloys ultrafine grains Very high cycle fatigue

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Microstructure refinement and second phase particle regulation of Mo-Y_(2)O_(3) alloys by minor TiC additive

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International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2012-2019页

作者： Weiqiang Hu Fengming Gong Shaocun Liu Jing Tan Songhua Chen Hui Wang Zongqing Ma Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300072China CNPC Project Management Company Tianjin Design Institute Tianjin 300072China College of Chemistry and Material Science Longyan UniversityLongyan 364012China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

The oxide dispersion strengthened Mo alloys(ODS-Mo)prepared by traditional ball milling and subsequent sintering technique generally possess comparatively coarse Mo grains and large oxide particles at Mo grain boundaries(GBs),which obviously suppress the corresponding strengthening effect of oxide addition.In this work,the Y_(2)O_(3) and TiC particles were simultaneously doped into Mo alloys using ball-milling and subsequent low temperature sintering.Accompanied by TiC addition,the Mo-Y_(2)O_(3) grains are sharply refined from 3.12 to 1.36μm.In particular,Y_(2)O_(3) and TiC can form smaller Y-Ti-O-C quaternary phase particles(~230 nm)at Mo GBs compared to single Y_(2)O_(3) particles(~420 nm),so as to these new formed Y-Ti-O-C particles can more effectively pin and hinder GBs movement.In addition to Y-Ti-O-C particles at GBs,Y_(2)O_(3),TiOx,and TiCx nanoparticles(grains,which is significantly different from traditional ODS-Mo.The appearance of TiOx phase indicates that some active Ti within TiC can adsorb oxygen impurities of Mo matrix to form a new strengthening phase,thus strengthening and purifying Mo matrix.Furthermore,the pure Mo,Mo-Y_(2)O_(3),and Mo-Y_(2)O_(3)-TiC alloys have similar relative densities(97.4%-98.0%).More importantly,the Mo-Y_(2)O_(3)-TiC alloys exhibit higher hardness(HV0.2(425±25))compared to Mo-Y_(2)O_(3) alloys(HV0.2(370±25)).This work could provide a relevant strategy for the preparation of ultrafine Mo alloys by facile ball-milling.

关键词： Mo-Y_(2)O_(3)-TiC alloys ball-milling low temperature sintering ultrafine grains high hardness

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Texture Evolution and ultrafine Grain Formation in Cross-Cryo-Rolled Zircaloy-2

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Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 837-846页

作者： Sunkulp Goel R.Jayaganthan I.V.Singh D.Srivastava G.K.Dey N.Saibaba Department of Metallurgical and Materials Engineering Centre of Nanotechnology Department of Mechanical and Industrial Engineering Materials Science Division Bhabha Atomic Research Center Nuclear Fuel Complex Limited

The texture and mechanical properties of cross-rolled zircaloy-2 at 77 and 300 K were investigated.Crossrolling at 77 K was performed to impart different thickness reductions of 25% and 50%,while at 300 K with 25%,50%,75% and 85% reductions to the sample.EBSD analysis of deformed sample showed that near-basal orientation is not deformed completely after 50% rolling reduction.The activation of prismatic silp,{1122} contraction twin and {1012} extension twin were evident from the deformed microstructure at 77 K.The propensity for activation of basal slip〈a〉 at77 K was also observed.The deformation of the sample at 300 K occurs by prismatic,basal 〈a〉 and pyramidal 〈c＋a〉slips,which were predicted by pole figures.After annealing,the tensile strengths（735 and 710 MPa） are almost the same for 50% cryo-cross-rolled and room-temperature cross-rolled zircaloy-2 with almost 2.7% difference in their ductility.KAM analysis of the deformed samples was made to estimate the stored strain energy and dislocation density.Annealing of deformed sample at 673 K for 30 min results in recrystallization,which leads to the formation of ultrafine grains.

关键词： Cross-rolling EBSD TEM ultrafine grains Texture

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Grain size altering yielding mechanisms in ultrafine grained high-Mn austenitic steel:Advanced TEM investigations

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Journal of Materials Science & Technology 2021年第27期86卷 192-203页

作者： Chang-Yu Hung Yu Bai Nobuhiro Tsuji Mitsuhiro Murayama Department of Materials Science and Engineering Virginia TechBlacksburgVA24061USA Department of Materials Science and Engineering Kyoto UniversityYoshida-honmachiSakyo-kuKyoto606-8501Japan Elements Strategy Initiative for Structural Materials Kyoto UniversityYoshida-honmachiSakyo-kuKyoto606-8501Japan Institute for Materials Chemistry and Engineering Kyushu UniversityKasugaFukuoka8168580Japan

The underlying mechanism of discontinuous yielding behavior in an ultrafine-grained(UFG)Fe-31 Mn-3 Al-3 Si(wt.%)austenitic TWIP steel was investigated by the use of advanced TEM technique with taking the plastic deformation mechanisms and their correlation with grains size near the macroscopic yield point into account.Typical yield drop mechanisms such as the dislocation locking by the Cottrell atmosphere due to the presence of interstitial impurities cannot explain the origin of this phenomenon in the UFG high-Mn austenitic TWIP steel.Here,we experimentally revealed that the plastic deformation mechanisms in the early stage of deformation,around the macroscopic yield point,show an obvious association with grain size.More specifically,the main mechanism shifts from the conventional slip in grain interior to twinning nucleated from grain boundaries with decreasing the grain size down to less than 1μm.Our observation indicates that the grain size dependent deformation mechanisms transition is also deeply associated with the discontinuous yielding behavior as it could govern the changes in the grain interior dislocation density of mobile dislocations around the macroscopic yield point.

关键词： ultrafine grains TWIP steel Yield-drop phenomenon Deformation twin nucleation Structural defects Transmission electron microscopy

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Thermally stable ultrafine grained copper induced by CrB/CrB_(2) microparticles with surface nanofeatures via regular casting

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Journal of Materials Science & Technology 2020年第23期58卷 55-62页

作者： Gongcheng Yao Chezheng Cao Shuaihang Pan Jie Yuan Igor De Rosa Xiaochun Li Department of Materials Science and Engineering University of CaliforniaLos AngelesCA 90095USA Department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesCA 90095USA

ultrafine-grained(UFG)/nanocrystalline materials possess novel properties. Refining as-solidified grains of metals to the ultrafine and even nanometer scale by nanoparticles via slow cooling has been recently discovered. Here, we report that microparticles(CrB and CrB_(2)) with surface nanofeatures can also enable ultrafine/nano grains via slow cooling. CrB/CrB_(2) microparticles, formed by coalescence of nanoparticles in Cu matrix, display surface nanofeatures, which induce substantial grain refinement and stabilization down to the ultrafine/nano scale. The UFG Cu/Cr B and Cu/CrB_(2) samples exhibit exceptional thermal stability, comparable to UFG Cu induced by nanoparticles, without coarsening after annealing at 600°C for 1 h. The microhardness, strengths, and Young's moduli of the Cu/Cr B and Cu/CrB_(2) samples are significantly enhanced over pure Cu. This discovery has great potential to advance the mass production UFG/nanocrystalline for widespread applications.

关键词： Copper Microparticles with nanofeatures Casting ultrafine grains Thermal stability

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Achieving Large-area Bulk ultrafine Grained Cu via Submerged Multiple-pass Friction Stir Processing

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Journal of Materials Science & Technology 2013年第12期29卷 1111-1115页

作者： P. Xue B.L. Xiao Z.Y. Ma Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China

Large-area bulk ultrafine grained （UFG） pure Cu was successfully prepared by multiple-pass overlapping friction stir processing （FSP） under additional rapid cooling. Overlapping FSP did not exert a significant effect on the microstructure and mechanical properties of the FSP UFG Cu. Similar average grain size was achieved in the transitional zone （TZ） of the multiple-pass FSP sample compared to that in the nugget zone of the single-pass FSP sample, and the TZ exhibited a strong {111}（112） type A fiber shear texture, Very weak softening occurred in the TZ of the multiple-pass FSP UFG Cu, resulting in a relatively uniform hardness distribution throughout the whole processed zone. A high yield strength of - 310 MPa and a uniform elongation of - 13% were achieved in the bulk FSP UFG Cu. This study provides an effective strategy to prepare large-area bulk IUFG materials.

关键词： Friction stir processing Multiple-pass ultrafine grains Microstructure Mechanical properties

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