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Hot Deformation behavior and strain compensation constitutive model of equiaxed fine grain diffusion-welded micro-duplex TC4 titanium alloy

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Chinese Journal of Aeronautics 2023年第4期36卷 510-522页

作者： Can LI Imran SARDAR MUHAMMAD Lihui LANG Yingjian GUO Xiaoxing LI Sergei ALEXANDROVA Dexin ZHANG School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China

In this work,two-stage diffusion bonding of micro-duplex TC4 titanium alloy was car-ried out to study the flow behavior and constitutive models of the bonding joint and the base metal after the same thermal cycling during the hot forming process.Microstructure and mechanical properties test were used to verify the good quality of the equiaxed fine grain diffusion-welded TC4 alloy.Quasi-static tensile experiment was carried out at temperatures ranging from 750–900℃and strain rates of 0.0001–0.1 s^(-1).The joint showed the weak dynamic recovery at strain rates of 0.01–0.1 s^(-1)and temperatures of 750–850℃.At strain rates of 0.0001–0.001 s^(-1)and tempera-tures of 850–900℃,the flow stress of joint presented steady-state characteristics.Different defor-mation conditions lead to the remarkable difference of dynamic softening performance between the joint and heat-treated base metal,but the flow stress in elastic and strain hardening stages exhibited similar behavior.The strain compensated Arrhenius-type constitutive models of TC4 joint and heat-treated base metal were developed respectively.The fifth-order polynomial functions between the material property correlation coefficients and strain were obtained.The models have shown good correlation,with correlation coefficient values of 0.984 and 0.99.The percentage average absolute relative error for the models were found to be 10%and 9.46%,respectively.

关键词： Constitutive models Deformation Diffusion bonding Micro-duplex Titanium alloys

Effect of the capsule on Deformation and densification behavior of nickel-based superalloy compact during hot isostatic pressing

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 122-130页

作者： Lebiao Yang Xiaona Ren Chao Cai Pengju Xue MIrfan Hussain Yusheng Shi Changchun Ge Institute of Powder Metallurgy and Advanced Ceramics School of Materials and EngineeringUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Materials Processing&Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The Shima yield criterion used in finite element analysis for nickel-based superalloy powder compact during hot isostatic pressing(HIP) was modified through uniaxial compression experiments. The influence of cylindrical capsule characteristics on FGH4096M superalloy powder compact Deformation and densification behavior during HIP was investigated through simulations and experiments. Results revealed the simulation shrinkage prediction fitted well with the experimental shrinkage including a maximum shrinkage error of 1.5%. It was shown that the axial shrinkage was 1.7% higher than radial shrinkage for a cylindrical capsule with the size of ∮50 mm × 100 mm due to the force arm difference along the axial and radial direction of the capsule. The stress deviated from the isostatic state in the capsule led to the uneven shrinkage and non-uniform densification of the powder compact. The ratio of the maximum radial displacement to axial displacement increased from0.47 to 0.75 with the capsule thickness increasing from 2 to 4 mm. The pressure transmission is related to the capsule thickness, the capsule material performance, and physical parameters in the HIP process.

关键词： hot isostatic pressing nickel-based superalloy compact capsule densification Deformation

Deformation Characteristics and Mechanical Properties of Ti/Al Bimetallic Composite Materials Fabricated by Wire Plus Arc Additive Manufacturing

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Journal of Wuhan University of Technology(Materials Science) 2023年第4期38卷 885-892页

作者：夏玉峰 ZHANG Xue CHEN Lei JIANG Xianhong LIAO Hailong College of Materials Science and Engineering Chongqing UniversityChongqing400044China

We focused on Ti/Al composite materials fabricated by wire and arc addictive manufacturing,and the microstructure and interface characteristics of them before and after hot compression Deformation were compared.After compression Deformation,allαstructures of titanium were compacted with the emergence of Widmanstatten structures.Coarsened coloniesαof titanium were elongated and waved along the original growth direction,resulting in anisotropy of grains.Pores and Ti/Al intermetallic compounds of aluminum are significantly decreased after hot compression.Meanwhile,a good bonding interface between titanium and aluminum is obtained after hot compression,and the element diffusion is more intense.In addition,the mechanical properties and fracture behaviors of Ti/Al composite material with different clad ratio that is defined as the ratio of the thickness of titanium to that of the Ti/Al composite material are investigated by uniaxial tensile test.The experimental results show that the ultimate tensile strength of Ti/Al composite material is between that of single deposited titanium and aluminum,while the elongation of Ti/Al composite material with low clad ratio is lower than that of single aluminum due to the metallurgical reaction.As the clad ratio increases,the two component layers are harder to separate during Deformation,which is resulted from the decrease of the inward contraction stress of three-dimensional stress caused by necking of aluminum.This work may promote the engineering application of Ti/Al bimetallic structures.

关键词： wire plus arc additive manufacturing aluminium alloy titanium alloy bimetallic composite materials Deformation mechanical properties

Vertical Deformation model on postseismic phase using exponential and logarithmic function based on InSAR

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Geodesy and Geodynamics 2023年第4期14卷 392-400页

作者： Irma Yusiyanti Tattyana Wening Kalbuadi Prajardi Yofita Indah Saputri Cecep Pratama Graduate School of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia Graduate School of Geomatics Engineering Universitas Gadjah MadaYogyakartaIndonesia Department of Geodetic Engineering Universitas Gadjah MadaYogyakartaIndonesia

The Palu MW7.4 earthquake occurred on September 28, 2018, with the epicenter at 119.86°, 0.72°. The severe shaking caused severe damage in Central Sulawesi, especially in Palu. We conducted a postseismic Deformation study to determine the Deformation pattern and reduce future earthquakes’ impact.Interferometric Synthetic Aperture Radar(In SAR) data were processed using Li CSBAS to get the time series. The time series data were fitted to exponential and logarithmic functions to determine the mechanism of postseismic Deformation. The exponential model identified the influence of the viscoelastic mechanism, and the logarithm identified the afterslip mechanism. The Palu earthquake was fitted to logarithmic and exponential, but the logarithmic was more significant than an exponential function.Afterslip mechanism predominates, and viscoelastic mechanisms play a minor role in this postseismic Deformation.

关键词： Earthquake Deformation Postseismic Physical mechanism Exponential Logarithmic

Influence of Deformation on the corrosion behavior of LZ91 Mg-Li alloy

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 72-81页

作者： Xueqin Liu Xuejian Wang Enyu Guo Zongning Chen Huijun Kang Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Ningbo Institute of Dalian University of Technology Ningbo 315000China

The effect of rolling and forging on the microstructure and corrosion behavior of LZ91 alloy was investigated using an electron probe micro-analyzer,immersion and electrochemical tests.Results showed that the area fraction of theβ-Li phase remained unchanged,and the grain size of theβ-Li phase decreased after forging.The as-rolled forged alloy(FR-LZ91)exhibited the highest area fraction of theβ-Li phase and the longest grains.The corrosion resistance of the forged LZ91 alloy increased due to grain refinement that prevented further corrosion during the immersion test.Among the experimental alloys,FR-LZ91 showed the highest resistance of corrosion film and charge transfer resistance values due to its protective film caused by the high area fraction of theβ-Li phase.

关键词： magnesium lithium alloy Deformation electrochemical test corrosion behavior

Deformation Characterization,Twinning Behavior and Mechanical Properties of Dissimilar Friction-Stir-Welded AM60/AZ31 Alloys Joint During the Three-Point Bending

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Acta Metallurgica Sinica(English Letters) 2022年第5期35卷 727-744页

作者： Junlei Zhang Han Liu Xiang Chen Qin Zou Guangsheng Huang Bin Jiang Aitao Tang Fusheng Pan College of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China State Key Laboratory of Mechanical Transmission College of Materials Science and EngineeringChongqing UniversityChongqing400044China National Engineering Research Center for Mg Alloys Chongqing UniversityChongqing400044China

The AZ31 and AM60 alloys were used for dissimilar friction stir welding(FSW)in this study.The microstructure characteristics of the joint and its three-point bending performance were investigated.The electron backscattered diffraction results showed that the grains in the nugget zone(NZ)were more uniform and refined to a certain extent after FSW,but the grain size of AM60 in the NZ was larger than that of AZ31.The texture was strong locally in the NZ and presented a symmetric distribution characteristic from the advancing side to the retreating side.There were special texture features in the joint,resulting in the occurrence of severe strain localization during the bending process compared with the base materials,which can be well explained by the calculated Schmid factor in terms of the assumed stress state for bending.The bending tests revealed that the joint presented good bending properties compared with AZ31 BM.The bending fracture morphologies suggested that the fracture tended to the NZ interface on the AZ31 side,which was mainly due to the higher SF for basal slip and dislocation concentration degree in the region,and the relatively lower bending strength of AZ31 metal.

关键词： Friction stir welding(FSW) Dissimilar joint Microstructure evolution Bending properties Deformation

Deformation twinning in octahe dron-base d face-centere d cubic metallic structures:Localized shear-force dipoles drive atomic displacements

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Journal of Materials Science & Technology 2022年第31期126卷 116-126页

作者： Hengfei Gu Chengze Liu Fusen Yuan Fuzhou Han Yingdong Zhang Muhammad Ali Wenbin Guo Jie Ren Lifeng Zhang Songquan Wu Geping Li Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China University of Science and Technology of China Hefei 230026China Institute of Molecular Plus Tianjin UniversityTianjin 300072China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Twinning is found to impart favorable mechanical,physical and chemical properties to nanostructured materials.Deformation twinning prevails in face-centered cubic(FCC)nanocrystalline materials upon loading.In FCC structures,the{111}Deformation twinning is traditionally believed to nucleate and grow through layer-by-layer emission of 1/6Shockley partial dislocations on consecutive{111}planes.We report that Deformation twinning is able to occur in crystalline(Fe,Nb)_(23)Zr_(6)nanoparticles(NPs)that have a large Mn 23 Th 6-type FCC structure with a Zr-octahedron as a motif.Based on direct atomic-scale observations,we discover a new zero-net-strain path for the{111}Deformation twin-ning in FCC structures.To form a[¯1¯12]/(111)twin,for example,short(¯1¯11)planes within two adjacent(111)plane layers in the repeated three-layer sequence of(111)planes are shear deformed continuously by a shear-force dipole along the[11¯2]direction like a domino effect,whereas the other(111)plane in the repeated sequence remains intact.In addition,a loading criterion for Deformation twinning of a FCC NP under uniaxial compression is proposed based on our observations.Our work here not only extends the fundamental understanding on Deformation twinning in FCC structures,but also opens up studies of Deformation behaviors in a class of Mn 23 Th 6-type FCC materials.

关键词： Deformation cubic dipole

Response of drainage to tectonics and PS-InSAR derived Deformation study in Bilaspur,northwestern Himalaya,India

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Geodesy and Geodynamics 2022年第3期13卷 205-218页

作者： Moulishree Joshi Girish Ch Kothyari Kapil Malik Ajay Kumar Taloor Department of Geology Kumaun University NainitalIndia Institute of Seismological Research GandhinagarGujaratIndia IIT Indian School of Mines DhanbadIndia Department of Remote Sensing and GIS University of JammuJammuIndia

The study of drainage patterns in tectonically active regions is conducive to the prediction of regional geomorphology.Subtle subsurface changes can be detected by drainage conditions and manifested in the form of drainage anomalies.The Satluj valley of Bilaspur,which is traversed by numerous faults in northwest Himalayan region,was selected to analyze the effect of active tectonics on drainage evolution.With the Persistent Scatterer Interferometric Synthetic Aperture Radar(PS-InSAR)technique,SENTINEL-1A data were used to estimate the active surface Deformation between September 2015 and December 2020.The results show that the region between Barasar Thrust(BrT)and Main Central Thrust(MCT)is undergoing Deformation of±12 mm/yr.The Stream Power Incision Model(SPIM)was used to predict Deformation patterns.To validate the tectonic activity generated by the drainage network,seismic bvalues were calculated,indicating the accumulating stresses.This study shows the importance of drainage anomalies in tectonically active areas.When used in close combination with other seismotectonic parameters,drainage anomalies can be effective in delineating tectonically active regions.

关键词： Geomorphology Deformation Satluj river Himachal Himalaya

Intermetallic growth behavior during post Deformation annealing in multilayer Ti/Al/Nb composite interfaces

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1608-1617页

作者： R.Jafari B.Eghbali Department of Materials Engineering Faculty of EngineeringUrmia UniversityP.O.Box 57561-165UrmiaIran Faculty of Materials Engineering Sahand University of TechnologyP.O.Box 51335-1996TabrizIran

The tri-metal Ti-Al-Nb composites were processed through three procedures:hot pressing,rolling,and hot pressing,followed by subsequent rolling.The fabricated composites were then subjected to annealing at 600,625,and 650℃ temperatures at different times.Microstructure observation at the interfaces reveals that the increase in plastic Deformation strain significantly affects TiAl_(3) intermetallic layers’evolution and accelerates the layers’growth.On the contrary,the amount of applied strain does not significantly affect the evolution of the NbAl_(3) intermetallic layer thickness.It was also found that Al and Ti atoms’diffusion has occurred throughout the TiAl_(3) layer,but only Al atoms diffuse through the NbAl_(3) layer.The slow growth rate of the NbAl_(3) intermetallic layer is due to the lack of diffusion of Nb atoms and the high activation energy of Al atoms’reaction with Nb atoms.

关键词： intermetallic compounds diffusion Ti/Al/Nb composite Deformation annealing