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Dislocation Slip and crack nucleation Mechanism in Dual‑Phase Microstructure of Titanium Alloys:A Review

Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 353-365页

作者： Ke Wang Honghui Li Yu Zhou Jingfeng Wang Renlong Xin Qing Liu International Joint Laboratory for Light Alloys(MOE) School of Materials Science and EngineeringChongqing UniversityChongqing 400044China

The study on the deformation mechanism of titanium alloys is beneficial to revealing the influence of microstructure on mechanical properties,and then providing guidance for the optimization of microstructure and *** most near-αandα+βtitanium alloys,slip is the dominant deformation ***,investigating the slip initiation and slip transfer behavior,as well as crack nucleation mechanism,is essential to reveal the fundamental relationship between microstructure and mechanical ***,due to the coexistence of grain boundary and phase boundary in dualphase microstructure of titanium alloys,the phase content,grain size,grain boundary misorientation andα/βorientation relationship would affect the slip initiation and transfer behavior,resulting in a very complex plastic deformation *** on the previous investigations of deformation mechanism of near-αandα+βtitanium alloys,this review first analyzed the sequence of slip initiation betweenαandβphases and discussed the main factors affecting the slip initiation inα***,the basic rule of slip transfer and the influence of different interfaces on slip transfer were ***,the mechanism of crack nucleation and effect of microstructure on crack nucleation were analyzed based on slip transfer behavior.

关键词： Deformation mechanism Slip initiation Slip transfer crack nucleation

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3D analysis for pit evolution and pit-to-crack transition during corrosion fatigue

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第4期14卷 292-299页

作者： Xiao-guang HUANG Jin-quan XU Department of Engineering Mechanics China University of Petroleum Department of Engineering Mechanics Shanghai Jiao Tong University

This paper presents a deterministic model to predict the pit evolving morphology and crack initiation life of corrosion *** on the semi-ellipsoidal pit assumption,the thermodynamic potential including elastic energy,surface energy and electrochemical energy of the cyclically stressed solid with an evolving pit is established,from which specific parameters that control the pit evolution are introduced and their influence on the pit evolution are *** critical pit size for crack nucleation is obtained from stress intensity factor criterion and the crack nucleation life is evaluated by Faraday's ***,this paper presents a numerical example to verify the proposed model and investigate the influence of cyclic load on the corrosion fatigue crack nucleation *** corrosion pit appears approximately as a hemisphere in its early formation,and it gradually transits from semicircle to *** strain energy accelerates the morphology evolution of the pit,while the surface energy decelerates *** higher the stress amplitude is,the smaller the critical pit size is and the shorter the crack initiation life is.

关键词： Pit Evolving morphology Thermodynamic potential Critical pit size crack nucleation

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Analysis of crack initiation location and its influencing factors of fretting fatigue in aluminum alloy components

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Chinese Journal of Aeronautics 2022年第6期35卷 420-436页

作者： Jian WANG Caizhi ZHOU School of Civil Engineering and Architecture Southwest University of Science and TechnologyMianyang 621010China Shock and Vibration of Engineering Materials and Structures Key Laboratory'of Sichuan Province Southwest University of Science and TechnologyMianyang 621010China Department of Mechanical Engineering University of South CarolinaColumbia 29208United States

To promote the development of fretting fatigue assessment and control technology for aircraft components,this paper uses the Crystal Plasticity Finite Element(CPFE)method and sub-modeling technology to study the crack Initiation Location(CIL)of fretting fatigue in Aluminum Alloy(AA)*** effects of external excitations such as normal load,tangential load,and axial stress on the CIL are *** is found that the Most Likely cracked(MLC)site revealed in a specimen and the CIL may always be consistent after a limited number of cyclic loadings,and they are both located at the hotspot on the contact surface or in the *** MLC site may also migrate from the hotspot on the contact surface to the hotspot in the subsurface with an increase of the cyclic number,and finally transform into a *** relationship between the MLC site and the CIL of fretting fatigue and its influencing factors have also been described,as well as the identification method of the CIL of fretting fatigue,which provide theoretical and technical supports for anti-fretting fatigue design of AA components in service.

关键词： crack nucleation Crystal plasticity Equivalent plastic strain Fretting fatigue Hotspot

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In-situ study of damage mechanisms in Mg-6Li dual-phase alloy

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Journal of Materials Science & Technology 2024年第12期179卷 114-124页

作者： Jing Li Li Jin Sangbong Yi Xin Zhang Jie Dong Ming Luo Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi'an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationNorthwestern Polytechnical UniversityXi'an 710072China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Institute of Materials and Process Design Helmholtz-Zentrum HereonGeesthacht 21502Germany

Interfaces play a crucial role in influencing the mechanical properties of Mg *** Mg-Li dual-phase alloy,the type of interfaces is complex,which includes both grain boundary and phase boundary,and the influence of such interfaces on the damage nucleation is yet to be *** this paper,in-situ scanning electron microscopy(SEM)based measurements were carried out to investigate the meso-scale damage nucleation mechanisms of the Mg-6Li dual-phase *** show that 94.8%of cracks are nucleated at the α-Mg grain boundary in the post-uniform elongation stage,while 5.2%are at phase boundary and almost no crack at the β-Li grain *** initiation of α-Mg grain boundary cracks is attributed to strain incompatibility,which induces micro-strain localization,and then causes grain boundary sliding(GBS)and crack *** compatibility analysis reveals that the geometric compatibility factor(Mk)can be used to predict the nucleation of α-Mg grain boundary *** Mk is lower than 0.075,α-Mg grain boundary cracks tend to *** cracks are generated at the phase boundary is due to the mild strain partitioning between α-Mg phase and β-Li phase and may also be partly attributed to multiple slip systems in body-centered cubic(BCC)-structured β-Li phase,which can accommodate well with the deformation of adjacent α-Mg phase.

关键词： crack nucleation Strain localization Grain boundary sliding Phase boundary Mg–6Li dual-phase alloy

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A pathway to improve low-cycle fatigue life of face-centered cubic metals via grain boundary engineering

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Journal of Materials Science & Technology 2022年第18期113卷 82-89页

作者： X.J.Guan Z.P.Jia S.M.Liang F.Shi X.W.Li Department of Materials Physics and Chemistry School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China

To probe a pathway to improve the low-cycle fatigue life of face-centered cubic(FCC)metals via grain boundary engineering(GBE),the tension-tension fatigue tests were carried out on the non-GBE and GBE Cu-16 at.%Al alloys at relatively high stress *** results indicate that the cyclic strain localiza-tion and cracking at grain boundaries(GBs)can be effectively suppressed,especially at increased stress amplitude,by an appropriate GBE treatment that can result in a higher resistance to GB cracking and a greater capability of compatible ***,the sensitivity of fatigue life to stress amplitude can be weakened by GBE,and the low-cycle fatigue life of Cu-16 at.%Al alloys is thus distinctly improved.

关键词： Cu-Al alloy Grain boundary engineering Fatigue life crack nucleation Stress amplitude

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