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γ"variant-sensitive deformation behaviour of Inconel 718 superalloy

Journal of Materials Science & Technology 2022年第31期126卷 169-181页

作者： R.Y.Zhang H.L.Qin Z.N.Bi Y.T.Tang J.Araújo de Oliveira T.L.Lee C.Panwisawas S.Y.Zhang J.Zhang J.Li H.B.Dong Centre of Excellence for Advanced Materials Dongguan 523808China School of Engineering University of LeicesterUniversity RoadLeicester LE17RHUnited Kingdom Beijing Key Laboratory of Advanced High Temperature Materials Central Iron and Steel Research InstituteBeijing 100081China Department of Materials University of OxfordParks RoadOxford OX13PHUnited Kingdom StressMap Engineering and Innovation DepartmentThe Open UniversityWalton HallMilton Keynes MK76AAUnited Kingdom ISIS Neutron Source Rutherford Appleton LaboratoryHarwell Science and Innovation CampusChiltonOxfordshire OX110QXUnited Kingdom School of Material Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Strengthening in Inconel 718 superalloy is derived from dislocation interaction withγ"precipitates,which exist in disk-shaped three possible orientation variants with their{100}habit plane normal to each *** interactions between dislocations andγ"precipitates vary according to theγ"orienta-tion variants,which makes the deformation behaviour complicated and difficult to reveal *** this work,γ"variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive ***γ"variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room *** is demonstrated that yield-ing first takes place in grains oriented withparallel to the loading *** identical lattice strain response to applied stress of both theγmatrix and theγ"precipitates was observed during yield-ing,suggesting that dislocations shearing through theγ"precipitates is predominant at this ***-ations in yield strength for samples with differentγ"variant distributions were observed,which can be attributed to different strengthening that arises from interactions between dislocation and differentγ"variants.

关键词： Ni-base superalloys Precipitation strengthening Neutron diffraction Lattice strains plastic deformation

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Characterization of microstructure and strain response in Ti-6Al-4V plasma welding deposited material by combined EBSD and in-situ tensile test

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Transactions of Nonferrous Metals Society of China 2014年第12期24卷 3929-3943页

作者： Martin BORLAUG MATHISEN Lars ERIKSEN Yingda YU Ola JENSRUD Jarle HJELEN Department of Materials Science and Engineering Norwegian University of Science and Technology Eggemoen Aviation and Technology Park Norsk Titanium AS Department of Materials Technology Raufoss Technology AS

Additive layer manufacturing （ALM） of aerospace grade titanium components shows great promise in supplying a cost-effective alternative to the conventional production routes. Complex microstructures comprised of columnar remnants of directionally solidifiedβ-grains, with interior inhabited by colonies of finerα-plate structures, were found in samples produced by layered plasma welding of Ti-6Al-4V alloy. The application of in-situ tensile tests combined with rapid offline electron backscatter diffraction （EBSD） analysis provides a powerful tool for understanding and drawing qualitative correlations between microstructural features and deformation characteristics. Non-uniform deformation occurs due to a strong variation in strain response between colonies and across columnar grain boundaries. Prismatic and basal slip systems are active, with the prismatic systems contributing to the most severe deformation through coarse and widely spaced slip lines. Certain colonies behave as microstructural units, with easy slip transmission across the entire colony. Other regions exhibit significant deformation mismatch, with local build-up of strain gradients and stress concentration. The segmentation occurs due to the growth morphology and variant constraints imposed by the columnar solidification structures through orientation relationships, interface alignment and preferred growth directions. Tensile tests perpendicular to columnar structures reveal deformation localization at columnar grain boundaries. In this work connections are made between the theoretical macro- and microstructural growth mechanisms and the observed microstructure of the Ti-6Al-4V alloy, which in turn is linked to observations during in-situ tensile tests.

关键词： Ti-6Al-4V alloy additive layer manufacturing electron backscatter diffraction in-situ tensile test plasma arc welding microstructure plastic deformation

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A user-friendly yield criterion for metals exhibiting tension-compression asymmetry

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Chinese Journal of Aeronautics 2020年第10期33卷 2602-2609页

作者： Lei CHEN Weidong WEN Hongjian ZHANG Faculty of Civil Engineering&Mechanics Jiangsu UniversityZhenjiang 212013China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The aim of this paper is to model the yielding asymmetry of pressure-insensitive metals,including but not limited to Ni3 Al *** main focuses are put on the flexibility and manipulative *** parameters of theory are kept to a minimum and can be determined by as few tests as *** requirements are fulfilled by constructing a yield function using the second and third-invariants of a linearly transformed stress *** proposed yield criterion has a simple mathematical form and has only seven parameters when used in three-dimensional *** with existing theories,the new yield criterion has much fewer parameters,which makes it very convenient for practical *** coefficients of the criterion are identified by an error minimization *** to a Ni3 Al based intermetallic alloy as well as a Cu-Al-Be shape memory alloy and comparison to other criteria show that the proposed criterion has nearly the same predictive ability and flexibility with other *** proposed yield criterion can estimate the coefficients by using less data,which is a big advantage compared with other similar theories,especially when there is a limited number of experimental data.

关键词： Ni3Al based alloy plastic anisotropy plastic deformation Tension-compression asymmetry Yield criterion Yield stress

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Load dependent microstructural evolution in an as-cast 26%Cr high chromium cast iron during unlubricated sliding

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Friction 2022年第8期10卷 1258-1275页

作者： U.Pranav NAYAK Sebastian SUÁREZ Valentin PESNEL Frank MÜCKLICH María Agustina GUITAR Department of Materials Science Saarland UniversitySaarbrücken 66123Germany Materials Engineering Center Saarland Saarbrücken 66123Germany Ecole Européenne d’ingénieurs en Génie des Matériaux Universitéde LorraineNancy 54000France

In the current study,an as-cast 26%Cr high chromium cast iron(HCCI)alloy was subjected to dry-sliding linear wear tests,under different *** loads were selected based on analytically computing the critical load(PC)i.e.,the load necessary to induce plastic *** PC was calculated to be 15 N and accordingly,a sub-critical load(5 N)and an over-critical load(20 N)were *** influence of increasing the load during the wear test was investigated in terms of the matrix microstructural behaviour and its ability to support the surrounding *** morphological aspects of the wear tracks,and the deformed matrix microstructure adjacent and underneath the track was analysed by confocal laser scanning microscope(CLSM)and scanning electron microscope(SEM),*** evidence of plastic deformation of the matrix was observed below *** the contrary,at loads equal to and higher than PC,the austenitic matrix plastically deformed as evidenced by the presence of slip *** backscattered diffraction(EBSD)measurements in terms of grain reference orientation deviation,and micro-Vickers hardness of the austenitic matrix indicated a deformation depth of about 40μm at the maximum applied load of 20 *** active wear mechanisms during sliding were a combination of both adhesive and abrasive wear,although increasing the load shifted the dominant mechanism towards *** was primarily attributable to the increased propensity for carbide cracking and fracturing,combined with the inability of the hardened austenitic matrix surface and sub-surface to adequately support the broken carbide ***,the shift in the dominant wear mechanism was also reflected in the wear volume and subsequently,the wear rate.

关键词： high chromium cast iron unlubricated sliding plastic deformation wear resistance carbide spallation matrix hardness

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Failure mechanism of as-cast Mg-6Zn-2Er alloy during tensile test at room temperature

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Transactions of Nonferrous Metals Society of China 2013年第11期23卷 3193-3199页

作者：刘轲王庆峰杜文博李淑波王朝辉北京工业大学材料科学与工程学院北京100124

Tensile test of the as-cast Mg-6Zn-2Er alloy was conducted at room temperature. The results indicate that the alloy is inclined to failure when the strain reaches 5.6%. The coarse secondary phases are responsible for the failure, especially for the Mg3Zn3Er2 phase （W-phase）. It is indicated that the existence of the W-phase activates the stress concentrations due to the incapacity of W-phase for the load transfer, which results in the void at the inner of the W-phase. In comparison, the interface between the matrix and the secondary phase is stable. In conclusion, the characters of the secondary phases with respect to size, distribution, morphology and type, play an important role in the plastic deformation behavior of the alloy.

关键词： Mg alloy Mg-Zn-Er alloy microstructure mechanical properties W-phase crack plastic deformation

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Texture of deformed Cu-Cr-Zr alloys

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Journal of University of Science and Technology Beijing 2008年第4期15卷 434-439页

作者： Huaqing Li Shuisheng Xie Xujun Mi Pengyue Wu Yanfeng Li State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Beijing 100088 China Suzhou Research Institute for Nonferrous Metals Suzhou 215026 China

The influences of plastic deformation, aging treatment, and alloying elements on the texture of Cu-Cr-Zr alloys were ex- plored. The texture component and intensity of Cu-Cr-Zr alloys under various working conditions after aging treatment were characterized using the orientation distributing function （ODF）. The influence of Zr content on the texture of Cu-Cr-Zr alloys was also analyzed. The reduction pass and deformation level were primary factors influencing the texture. Rolling texture appeared in a rolled plate and the fibrous textures of {111} and {001} were detected after 80% deformation. Fibrous texture with a main constituent of {111} improved the tensile strength of the alloy wire. The texture contents of {110}〈331〉 and {110}〈112〉 were predominated, whereas, those of {113}〈332〉 and {112}〈111〉 were in the minority in the Cu-Cr-Zr alloy with a higher Zr content （〉0.5wt%）. However, in the samples with a lower Zr content （〈0.1wt%）, the texture contents of {113}〈332〉, {112}〈111〉, and {111}〈110〉 were in the majority.

关键词： Cu-Cr-Zr alloys preferred orientation rolling texture plastic deformation aging treatment alloy element

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Dependence of Microstructure Evolution and Mechanical Properties on Loading Direction for AZ31 Magnesium Alloy Sheet with Non-basal Texture During In-Plane Uniaxial Tension

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Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 223-234页

作者： Li Hu Mingao Li Qiang Chen Tao Zhou Laixin Shi Mingbo Yang College of Material Science and Engineering Chongqing University of TechnologyChongqing 400054China Southwest Technology and Engineering Research Institute Chongqing 400039China

In-plane uniaxial tension of AZ31 magnesium alloy sheet with non-basal texture has been conducted in order to demonstrate the effects of loading direction on the microstructure evolution and mechanical properties at ambient *** axes are chosen to be along five directions distributed between rolling direction(RD)and transverse direction(TD),allowing various activities in involved slip and twinning modes to take *** for twinning modes,electron backscattered diffraction observations confirm that the contribution of{1011}compression twinning is minimal to the plastic deformation of all deformed *** comparison,{1012}extension twinning(ET)not only serves as an important carrier on sustaining and accommodating plastic strain but also contributes to the emergence of TD-component texture with the progression of plastic *** terms of slip modes,analysis on Schmid factor demonstrates that the increasing tilted angle between loading direction and RD of sheet is unfavorable to the activation of basalslip,whereas it contributes to the activation of prismatic*** observations consequently explain the increasing tendency of 0.2%proof yield ***,the activations of basalslip and{1012}ET collectively contribute to the concentration of two tilted basal poles toward normal *** increasing angle between loading direction and RD,the activations of basalslip and{1012}ET are gradually *** leads to a weakening tendency about concentration of two tilted basal poles,a generally increasing tendency about Lankford value(r-value)and a generally decreasing tendency about strain-hardening exponent(n-value).

关键词： AZ31 magnesium alloy Non-basal texture plastic deformation Microstructure evolution

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Reverse Transformation in[110]-Oriented Face-Centered-Cubic Single Crystals Studied by Atomic Simulations

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Acta Metallurgica Sinica(English Letters) 2022年第10期35卷 1631-1640页

作者： Hai-Feng Zhang Hai-Le Yan Feng Fang Nan Jia Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang110819China State Key Lab Rolling&Automat Northeastern UniversityShenyang110819China

Bidirectional transformations,which are achieved by triggering both dynamic forward transformation from the face-centered-cubic(fcc)austenite to the hexagonal-close-packed(hcp)martensite and the reverse transformation from martensite to austenite during cold deformation,have been previously reported in FeMnCoCr-based high-entropy alloys(HEAs).This leads to the permanent refinement of microstructure and hence enhances the work-hardening capacity of *** order to reveal the microscopic mechanism of the reverse transformation in HEAs under deformation,the effect of the sample aspect ratio,i.e.,Z/X,on the evolution of deformation systems in the equi-atomic FeMnCoCrNi alloy with[110]orientation during uniaxial tensile loading along the Z direction is investigated by atomic simulations in this *** the aspect ratio is 0.5,the reverse transformation is more significant compared with other models,while a good plasticity can still be *** then compare the micromechanical behavior of three fcc single crystals,i.e.,FeMnCoCrNi,FeCuCoCrNi,and pure *** results show that the stacking fault energy plays a major role in the activation of different deformation mechanisms;however,the lattice distortion in the HEA does not significantly affect the activation of deformation ***,for all materials dislocation slip leads to the softening,while strain hardening is attributed to the initiation of multiple deformation *** Shockley partials slip leads to bidirectional phase transition,twinning and detwinning in the three ***,the reverse transformation can occur in all metallic materials where the fcc to hcp phase transformation is the dominant deformation *** findings contribute to an in-depth understanding of the deformation mechanism in fcc-structured materials under severe plastic deformation and provide theoretical guidance for the design of alloys with superior strength–plasticity combinations.

关键词： Face-centered-cubic materials Atomic simulation plastic deformation Reverse transformation

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Influence of groove surface texture on temperature rise under dry sliding friction

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Science China(Technological Sciences) 2016年第2期59卷 183-190页

作者： WU Wei SHAO TianMin CHEN GuiMing State Key Laboratory of Tribology Tsinghua University Beijing 100084 China Xi'an Research Institute of High Technology Xi'an 710025 China

Parallel groove surface textures with different area densities were fabricated on ASTM 1045 steel. Friction tests were con- ducted under dry sliding condition. Temperature rise, friction coefficient and wear of both the textured and untextured speci- mens were studied. An embedded K-type thermocouple beneath the friction surfaces was employed to measure frictional tem- perature rise. The results indicated that the temperature rise of the textured specimen was obviously reduced compared with that of the untextured specimen, although the difference between the friction coefficients was not significan.. The specimen with high texture density exhibited a small temperature rise. The difference in temperature rise between the specimens with different texture densities can be primarily attributed to differences in heat dissipation and energy allocation between the tri- bo-pairs caused by the textured structure. The energy consumed by wear and plastic deformation was small in ~：omparison with the total energy input by friction, thus, the influence of these factors on temperature rise can be considered to be~ negligible.

关键词： groove surface texture temperature rise heat dissipation wear plastic deformation

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Discrete element method study of hysteretic behavior and deformation characteristics of rockfill material under cyclic loading

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第4期24卷 350-365页

作者： Mingchun LIN Guanqi WANG Jian ZHOU Wei ZHOU Ni AN Gang MA State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Institute of Water Engineering Sciences Wuhan UniversityWuhan 430072China Power China Chengdu Engineering Co. Ltd.Chengdu 610072China Power China Kunming Engineering Co. Ltd.Kunming 650051China

Granular geomaterials under different loading conditions manifest various behaviors,such as *** their hysteretic behavior and deformation characteristics is the basis for establishing a constitutive relation with excellent performance in deformation *** deformation characteristics of crushable particle materials are analyzed through a series of cyclic loading tests conducted by numerical *** hysteretic behavior is investigated from a particle *** increase in particles with contacts less than two may be responsible for the residual strain,and the particle breakage further promotes particle rearrangement and volume *** the accumulation of plastic strain and the resilient modulus are found to be related to confining pressures,stress levels,cyclic loading amplitudes,and the number of *** plastic strain accumulation can be written as a function of the number of cycles and an evolution function of resilient modulus is proposed.

关键词： Granular material Discrete element method(DEM) plastic deformation Cyclic loading Hysteretic behavior

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