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A mechanical study of personalised Ti6Al4V tibial fracture fixation plates with grooved surface by finite element analysis

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Biosurface and Biotribology 2021年第3期7卷 142-153页

作者： Bo Liao Jipeng Sun Cheng Xu Rufeng Xia Wei Li Dong Lu Zhongmin Jin Key Laboratory for advanced technology of materials of Ministry of Education Tribology Research InstituteSouthwest Jiaotong UniversityChengduChina chengdu advanced metal materials Industry technology Research institute ChengduChina

Low shape matching and high stress shielding rates between bone plate and human bone are not conducive to the primary healing of fracture.In this study,taking the fracture site of the lower one‐third of human tibia as an application case,six types of personalised Ti6Al4V tibial plates with grooved surface were designed and evaluated by reverse en-gineering and finite element analysis.The results showed that the grooved design can reduce the stress shielding rate of bone plate and promote the facture healing.Among the six types of bone plates,the‘OUT-MI’bone plate has the lowest stress shielding rate and the most uniform stress distribution.Meanwhile,with the increasing tibial load during the convalescence,the average stress and maximum axial displacement of the tibial fracture surface increased,which can effectively improve the bone regeneration in the tibial fracture area.Moreover,there was no significant difference in four-point bending performance between the‘OUT-MI’bone plate and the‘STR-BE’bone plate,indicating that the mechanical properties of this bone plate were reliable.The results provide a theoretical basis for the design of fracture fixation plates on clinical treatment.

关键词： bone plate finite element analysis four-point bending grooved surface personalised design stress shielding

Role of radiative and convective heat transfer during heating of an ingot product in a tubular furnace:experiment and simulation

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Journal of Iron and Steel Research(International) 2022年第12期29卷 1978-1985页

作者： Wen-chao Yang Yang Zhou Jian Zhang Huan Liu Ying-jie Ren Jia-jun Chen Xian-guang Zhang School of metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China chengdu advanced metal materials industrial Technolgy Research institute Co. Ltd.Chengdu 610300SichuanChina

Convective heat transfer and radiative heat transfer are two essential heat transfer modes in the heating process of steel;it is important to understand the role of them during the heating process clearly.The effects of the convective and radiative heat transfer during the heating process of a cast ingot in a tubular furnace have been studied by the designed natural and forced convection experiments and mathematical simulations.The heating time for the center of the ingot to reach the furnace temperature is decreased with the increase in furnace temperature.According to the experimental and simulation results,a model is proposed regarding the role of radiative and convective heat transfer in the heating process.At low temperature,the convective heat transfer plays a dominant role,while at high temperature,the influence of radiative heat transfer is larger.And a critical temperature exists between them.The forced convective heat transfer can enhance the influence of the convective heat transfer.The critical temperature can be shifted to higher temperatures.

关键词： Reheating Tubular furnace Cast ingot Convective heat transfer Radiative heat transfer

Texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr dual-phase alloy during cold rolling based on multiscale crystal plasticity finite element model

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Journal of materials Science & technology 2022年第16期111卷 76-87页

作者： Duoduo Wang Qunbo Fan Xingwang Cheng Yu Zhou Ran Shi Yan Qian Le Wang Xinjie Zhu Haichao Gong Kai Chen Jingjiu Yuan Liu Yang National Key Laboratory of Science and technology on materials Under Shock and Impact School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing institute of technology Chongqing Innovation Center Chongqing 401135China Microstructure and Properties of materials(IEK-2) Forschungszentrum JülichJülichGermany chengdu advanced metal materials industrial technology Research institute Co.Ltd Chengdu 610000China

The complex micromechanical response among grains remains a persistent challenge to understand the deformation mechanism of titanium alloys during cold rolling.Therefore,in this work,a multiscale crystal plasticity finite element method of dual-phase alloy was proposed and secondarily developed based on LS-DYNA software.Afterward,the texture evolution and slip mode of a Ti-5.5Mo-7.2Al-4.5Zr-2.6Sn-2.1Cr alloy,based on the realistic 3D microstructure,during cold rolling(20%thickness reduction)were systematically investigated.The relative activity of the■slip system in theαphase gradually increased,and then served as the main slip mode at lower Schmid factor({110}slip system showed an upward tendency,indicating the important role of the critical resolved shear stress relationship in the relative activity evolutions.Furthermore,the abnormally high strain of very fewβgrains was found,which was attributed to their severe rotations compelled by the neighboring pre-deformedαgrains.The calculated pole figures,rotation axes,and compelled rotation behavior exhibited good agreement to the experimental results.

关键词： Titanium alloy Multiscale crystal plasticity finite element model Texture evolution Slip mode

Effects of microstructure characteristics on the tensile properties and fracture toughness of TA15 alloy fabricated by hot isostatic pressing

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International Journal of Minerals,metallurgy and materials 2023年第4期30卷 697-706页

作者： Langping Zhu Yu Pan Yanjun Liu Zhiyu Sun Xiangning Wang Hai Nan Muhammad-Arif Mughal Dong Lu Xin Lu Beijing advanced Innovation Center for materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China AECC Beijing institute of Aeronautical materials Beijing 100095China Beijing Engineering Research Center of advanced Titanium Alloy Precision Forming technology Beijing 100095China institute of Artificial Intelligence University of Science and Technology BeijingBeijing 100083China Sichuan advanced metal Material Additive Manufacturing Engineering technology Research Center Chengdu Advanced Metal Materials Industry Technology Research Institute Co.LtdChengdu 610300China

Powder hot isostatic pressing(HIP) is an effective method to achieve near-net-shape manufacturing of high-quality complex thinwalled titanium alloy parts, and it has received extensive attention in recent years. However, there are few reports about the microstructure characteristics on the strengthening and toughening mechanisms of powder hot isostatic pressed(HIPed) titanium alloys. Therefore, TA15powder was prepared into alloy by HIP approach, which was used to explore the microstructure characteristics at different HIP temperatures and the corresponding tensile properties and fracture toughness. Results show that the fabricated alloy has a “basket-like structure” when the HIP temperature is below 950℃, consisting of lath clusters and surrounding small equiaxed grains belts. When the HIP temperature is higher than 950℃, the microstructure gradually transforms into the Widmanstatten structure, accompanied by a significant increase in grain size. The tensile strength and elongation are reduced from 948 MPa and 17.3% for the 910℃ specimen to 861 MPa and 10% for the 970℃ specimen.The corresponding tensile fracture mode changes from transcrystalline plastic fracture to mixed fracture including intercrystalline cleavage.The fracture toughness of the specimens increases from 82.64 MPa·m^(1/2)for the 910℃ specimen to 140.18 MPa·m^(1/2)for the 970℃ specimen.Specimens below 950℃ tend to form holes due to the prior particle boundaries(PPBs), which is not conducive to toughening. Specimens above 950℃ have high fracture toughness due to the crack deflection, crack branching, and shear plastic deformation of the Widmanstatten structure. This study provides a valid reference for the development of powder HIPed titanium alloy.

关键词： powder titanium alloy hot isostatic pressing strength fracture toughness

Deformation mechanism of fine structure and its quantitative relationship with quasi-static mechanical properties in near β-type Ti-4.5Mo-5.1Al-1.8Zr-1.1Sn-2.5Cr-2.9Zn alloy

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Progress in Natural Science:materials International 2021年第5期31卷 742-748页

作者： Xinjie Zhu Qunbo Fan Duoduo Wang Haichao Gong Yu Gao Hong Yu Xingwang Cheng Zhiming Zhou Liu Yang National Key Laboratory of Science and technology on materials Under Shock and Impact School of Materials Science and Engineering Beijing Institute of Technology Beijing institute of technology Chongqing Innovation Center School of materials Science and Engineering Chongqing University of Technology chengdu advanced metal materials industrial technology Research institute Co.Ltd.

The deformation mechanism of the fine structure composed of primary α phase(αp) and acicular secondary αphase(αs) on quasi-static mechanical properties is still not very clear. The main controversy is focused on the role of αpin the mechanical behavior. In this paper, the microstructure of the heat-treated near β-type Ti-4.5 Mo-5.1 Al-1.8 Zr-1.1 Sn-2.5 Cr-2.9 Zn alloy after tensile tests was observed by transmission electron microscopy(TEM). And the results showed that in the slight deformation region the dislocations were accumulated at the intersection ofαpand β matrix separated by αs, while only a few dislocations nucleated in β matrix. In the severe deformation region, a large quantity of dislocations in both αpand β matrix were observed. It can be inferred that αpdeformed firstly and then activated the deformation of β matrix, that is, the thickness of αpand the inter-particle spacing ofαsplayed a dominant role in the deformation process. The quantitative relationship between the yield strength and the microstructure parameters is consistent with this inference. By adjusting the solution treatment parameters and the subsequent aging treatment, three fine structures were obtained, and the corresponding mechanical properties were determined. Furthermore, the yield strength can be described by the mathematical model σy= 756.4 + 135.6/hp1/2+32.2/ds1/2, where hpand dsare the thickness of αpand the inter-particle spacing of αs,respectively.

关键词： Deformation mechanism Fine structure Quantitative relationship Titanium alloy

Real-time evolution of up-conversion nanocrystals from tailored metastable intermediates

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Nano Research 2023年第1期16卷 1552-1557页

作者： Peng Zhang Xue Yu Ping Xia Zhenzhen Cui Jianhong Yi Caiju Li Peng Song Feng Zhao Ting Wang Jianbei Qiu Xuhui Xu Faculty of materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and TechnologyKunming 650093China Yunnan AFPN technology Company Limited Kunming 650093China School of Mechanical Engineering Institute for Advanced StudyInstitute for Advanced Materials Deformation and Damage from Multi-ScaleChengdu UniversityChengdu 610106China College of materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China

In-situ observation of the growth and decomposition processes is significantly important for guiding the fabrication of upconversion nanocrystals(UCNCs)with high performance.However,the high crystallization energy and rapid nucleation rate of the corresponding crystals make real-time observation still a huge challenge.Herein,the in-situ nucleation-growth-degradation processes of the UCNCs are investigated by employing tailored metastable intermediates,which possess a slowing-down nucleation rate under electron beam irradiation.The non-classical nucleation processes of the UCNCs,containing the coalescence of clusters and the subsequent crystallization,are demonstrated.Moreover,the Ostwald ripening and oriented attachment processes,which determine the particle size and morphology,are unambiguously recorded.Furthermore,the degrading process of the UCNCs is observed to be triggered by surface defects.Our work provides an insight into the real-time evolution dynamics of the UCNCs,which further sheds light on the fabrication of nano-sized up-conversion phosphors.

关键词： up-conversion nanocrystals metastable intermediates real-time evolution in-situ transmission electron microscopy(TEM)

Influence of Cold-Rolling Reduction on Microstructure and Tensile Properties of Nuclear FeCrAl Alloy with Low Cr and Nb Contents

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Acta metallurgica Sinica(English Letters) 2022年第12期35卷 2101-2110页

作者： Hui Wang Biao Guo Xuguang An Yu Zhang Science and technology on Reactor Fuel and materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China School of materials Science and Engineering Xihua UniversityChengdu 610039China Interdisciplinary materials Research Center Institute for Advanced StudyChengdu UniversityChengdu 610106China

FeCrAl alloy is one of the most promising candidates as an accident-tolerant fuel(ATF)cladding material.Herein,the influence of cold-rolling(CR)reduction on microstructure and tensile properties of the as-annealed FeCrAl alloys,with low Cr and Nb contents,is systematically examined.With the increase in CR reduction,the grain size of FeCrAl alloy is obviously refined after annealing because the increase in stored deformation energy leads to enhanced recrystallization.However,the large CR reductions result in a severe mixed-grain microstructure,significantly reducing the uniform deformability of the FeCrAl alloy.The dislocation density of the as-annealed FeCrAl alloy decreases with the increase in CR reduction,except for the excessive CR reduction of 50%.Moreover,the Laves phases are crushed and dissolved during CR and annealing,as well as large amounts of refined Laves phases are found after large CR reductions.The pinning effect of the Laves phases can significantly improve the strength of FeCrAl alloy.Accordingly,the strengthening mechanisms of FeCrAl alloy consist of fine-grain strengthening,dislocation strengthening and precipitation strengthening.Finally,the FeCrAl alloy,with a CR reduction of 30%,achieves optimal tensile properties.This study can provide theoretical guidance for the industrial production of the FeCrAl alloy.

关键词： FeCrAl alloy Cold-rolling reduction Tensile properties Microstructure evolution Strengthening mechanism

Oxidation and internal nitridation behaviors of a Ni-based superalloy Rene 65 during high-temperature homogenization

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Journal of Iron and Steel Research(International) 2023年第8期30卷 1622-1632页

作者： Xian-guang Zhang Jia-jun Chen Yang Zhou Lang Shui Dong-ping Xiao Jian-hui Fu Wen-chao Yang Huan Liu Ying-jie Ren Peng Shi Jian Zhang State Key Laboratory of advanced metallurgy University of Science and Technology Beijing(USTB)Beijing 100083China School of metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing 100083China Chengdu Advanced Metal Materials Industrial Technology Institute Co. Ltd.Chengdu 610300SichuanChina Iron and State Key Laboratory of metal Material for Marine Equipment and Application Anshan 114009LiaoningChina Pangang Group Research institute Co. Ltd.Panzhihua 617000SichuanChina

Homogenization heat treatment is a key process to remove the micro-segregation and re-dissolve the undesired phases for wrought superalloy.The oxidation behavior of the wrought superalloy during the high-temperature homogenization process,however,was rarely studied.The oxidation film evolution and growth kinetics of an as-cast superalloy Rene 65 during the homogenization were systematically studied.The oxide film consists of Cr_(2)O_(3) external oxidation layer and dendritic TiO_(2) and Al_(2)O_(3) internal oxidation layer.And the growth kinetics of the oxide film followed a parabolic law.Internal nitridation occurs during the oxidation process,and TiN is apparently formed at the tip of internal oxidation layer.The originally formed TiN can be transformed into TiO_(2) or retained with the progress of oxidation.Meanwhile,the TiN is newly formed in the deeper matrix at the new oxidation-layer tip.Thermodynamic analyses revealed that there is a competition between the oxidation and nitridation.Nitridation can occur when the partial pressure of nitrogen exceeds the threshold of nitridation and the critical partial pressure ratio of nitrogen and oxygen.

关键词： Nickel-based superalloy Homogenization Oxidation Kinetics Internal nitridation Thermodynamics

Design strategies of performance-enhanced Se cathodes for Li-Se batteries and beyond

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Journal of Energy Chemistry 2023年第1期76卷 528-546,I0013页

作者： Weiling Qiu Xiang Long Huang Ye Wang Chi Feng Haining Ji Hua Kun Liu Shi Xue Dou Zhiming Wang institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina institute for Superconducting and Electronic materials Australian Institute for Innovative MaterialsUniversity of WollongongNSW 2500Australia School of materials and Energy.University of Electronic Science and technology of China Chengdu 610054SichuanChina institute for advanced Study Chengdu UniversityChengdu 610106SichuanChina institute of Energy materials Science University of Shanghai for Science and TechnologyShanghai 200093China

Lithium-selenium(Li-Se)batteries are deemed as an emerging high energy density electrochemical energy storage system owing to their high specific capacity and volume capacity.Prior to their practicality,a series of critical challenges from the Se cathode side need to be overcome including low reactivity of bulk Se,shuttle effect of intermediates,sluggish redox kinetics of polyselenides,and volume change etc.In this review,recent progress on design strategies of functional Se cathodes are comprehensively summarized and discussed.Following the significance and key challenges,various efficient functionalized strategies for Se cathodes are presented,encompassing covalent bonding,nanostructure construction,heteroatom doping,component hybridization,and solid solution formation.Specially,the universality of these functional strategies are successfully extended into Na-Se batteries,K-Se batteries,and Mg-Se batteries.At last,a brief summary is made and some perspectives are offered with the goal of guiding future research advances and further exploration of these strategies.

关键词： metal-selenium batteries Se cathodes Carbons Nanostructure materials design