Review
Metallurgy & Metallurgical Engineering
Yuan Yue, Jian Wang, Jian-Feng Nie
Summary: This paper reviews the interactions between deformation twins and lattice defects in magnesium and its alloys. It covers interactions between twin boundaries and solute atoms, twin-dislocation interactions, and twin-twin interactions. The resulting structures, such as twin-twin junctions and tension-tension double twins, are discussed in detail. The review also highlights remaining research issues and provides suggestions for future work in this area.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Gang Huang, Bo Li
Summary: This study proposes a new method of reducing residual stress through combined magnetic-vibration treatment. The experiment results show that this method is effective in reducing residual stress, causing local plastic deformation and changes in the microstructure of the materials. The combined magnetic-vibration treatment method is accurate and reliable, with significant effects on the mechanical properties of the materials.
RESULTS IN PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Linfeng Bu, Zhao Cheng, Yin Zhang, HengAn Wu, Ting Zhu, Lei Lu
Summary: The strength-controlling dislocation mechanism in nanotwinned metals is illuminated by partitioning the flow stress into effective stress and back stress components. Recent experiments show a nearly constant saturated effective stress of about 100 MPa in nanotwinned Cu with nanotwin thicknesses less than 100 nm. This surprising result suggests that trans-twin dislocations spanning multiple nanotwin lamellae, rather than threading dislocations within individual lamellae, control the effective stress.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Weichao Zhao, Rui Feng, Xiaowen Wang, Min Feng, Yumei Sun, Benkui Gong, Xinjun Han, Tianjie Feng
Summary: In this study, the relationship between microstructure and etching performance of 12 mm thick rolled copper foil was systematically studied. The results showed that the etching performance improved with increasing annealing time, but the performance of copper foil annealed for 10 min was better than that annealed for 30 min. Factors such as the proportion of low angle grain boundaries, work-hardening and dislocation density, proportion of {001} crystal planes, and the presence of random high angle grain boundaries network played important roles in determining the etching rate and performance of copper foil.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Mechanical
Weidong Lu, Chunguo Zhang, Qihang Yu
Summary: This study investigates the influence of tensile overload during constant amplitude fatigue, particularly its impact on fatigue retardation and crack deflection. The results show that fatigue retardation decreases with increasing stress ratio R and disappears after removing the crack-tip damage zone. Additionally, the study finds that crack deflection is more pronounced at low stress ratios of 0.1-0.4 compared to a ratio of 0.7.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Coatings & Films
Jizhan Wu, Peitang Wei, Huaiju Liu, Boyu Zhang, Guibao Tao
Summary: The surface integrity of components treated by shot peening is influenced by shot peening process, procedure, and machine parameters. The intensity is mainly affected by shot diameter, air pressure, and shot flow rate. With increasing intensity, the maximum compressive residual stress and surface hardness increase linearly.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Qian Yin, Zhixun Wen, Jundong Wang, Yeda Lian, Guangxian Lu, Chengjiang Zhang, Zhufeng Yue
Summary: This study focuses on the stress and strain responses of a second-generation nickel-based superalloy at different temperatures and orientations. Microstructure and dislocation arrangements were observed to analyze the fracture failure modes and dislocation morphologies. A new hardening model and damage evolution law were proposed and successfully fitted the stress-strain response for different conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Kan Ma, Brigitte Decamps, Anna Fraczkiewicz, Frederic Prima, Marie Loyer-Prost
Summary: This study used self-ions to irradiate high-purity nickel and analyzed the dislocation loops in the specimens, revealing a transformation in the nature and Burgers vector of the loops along the implantation direction. Additionally, a defect-free layer related to the annihilation of vacancy defects by injected atoms was detected, allowing for the identification of the injection peak and validation of damage calculations in self-ion irradiated specimens.
SCRIPTA MATERIALIA
(2022)
Article
Mechanics
R. Sunder
Summary: An analytical procedure is described in this paper that connects crack opening stress intensity, K-op, with maximum stress intensity, K-max, associated with threshold conditions under constant amplitude loading. The proposed procedure is based on the experimental finding that closure-free intrinsic threshold stress intensity, Delta K-th, K-i, is solely related to a certain computed near-tip residual stress, sigma*. This procedure enables extrapolation of Delta K-th to lower values of K-max that cannot be reproduced by existing testing practices. It is demonstrated using experimental threshold data from a naval steel and a titanium alloy.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Xiang Wang, Sixue Zheng, Chuang Deng, Christopher R. Weinberger, Guofeng Wang, Scott X. Mao
Summary: By using in situ nanomechanical testing combined with atomistic simulations, the formation mechanisms of a 5-fold twin in nanostructured metals, such as gold, have been elucidated. Sequential twinning slip in varying slip systems and decomposition of high-energy grain boundaries play important roles in the formation process. The complex stress state in the neck area can also cause the breakdown of Schmid's law and result in 5-fold twin formation.
Article
Engineering, Mechanical
Dongling Yu, Huiling Zhang, Bin Li, Qi Zheng, Changfu Fang, Nanxing Wu
Summary: A three-dimensional model was established to study the deformation and damage of nano-twin 6H-SiC after friction. It was found that the barrier formed by layered faults can obstruct stress propagation and hinder the formation and expansion of dislocations. The strength of the twins exhibits Hall-Petch phenomenon, with the highest strength observed at a thickness of 10.3 nm. The twin boundary serves as the initiation point for deformation damage, and the damage increases with the thickness of the twin.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Xi Zhang, Qinghua Lu, Peilei Zhang, Zhishui Yu, Chen Shen, Lin Wang, Xueming Hua
Summary: In this study, Ti-48Al alloys were fabricated using TW-PAAM and TIG-WAAM techniques, and their microstructure, residual stress, and fatigue properties were characterized. The microstructure of TiAl alloy consists of dendritic grain region and fully lamellar colony region. The lower part of TiAl alloy has higher residual stress, and the TW-PAAM TiAl alloy has lower residual stress compared to the TIG-WAAM TiAl alloy. The lower part of TiAl alloy exhibits lower fatigue strength.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Engineering, Mechanical
Lingfeng Wang, Liucheng Zhou, Lulu Liu, Weifeng He, Xinlei Pan, Xiangfan Nie, Sihai Luo
Summary: The study found that combined laser shock peening and shot peening treatment can significantly improve the hardness and fatigue resistance of Ti-6Al-4V alloy specimens, especially showing more obvious effects under low energy impact.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Instruments & Instrumentation
Adrita Dass, Ashlee Gabourel, Darren Pagan, Atieh Moridi
Summary: The adoption of metal additive manufacturing (AM) has increased significantly, but the fundamental physical phenomena occurring during these processes are still challenging to explain. To address this problem, a custom metal AM system has been constructed to simulate powder fed directed energy deposition and integrated with a synchrotron source for operando studies. These experiments provide valuable data for studying material response to non-equilibrium solidification and intrinsic heat treatment, as well as characterizing changes in lattice spacing.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2022)
Article
Materials Science, Multidisciplinary
Hanjun Gao, Xin Li, Bianhong Li, Qiong Wu, Yandong Ma, Xiaojun Jian, Hechuan Song, Shuguang Chen
Summary: Thermal-vibratory stress relief (TVSR) is a novel method with significant advantages in reducing residual stress in Ti6Al4V compared to traditional methods. Through comparative studies on different process parameters and simulations, it is found that TVSR exhibits higher efficiency and rate in stress relief, with the potential for establishing quantitative relationships and analyzing effective parameter regions for stress relief mechanisms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Automation & Control Systems
Lennart Vincent Hoelscher, Thomas Hassel, Hans Juergen Maier
Summary: Currently, wire and arc additive manufacturing (WAAM) faces challenges in determining the height step between layers, which may result in improper welding outcomes. To address this issue, a closed-loop layer height control strategy is needed. The development of a sensing method to detect the contact tube to working distance (CTWD) in WAAM has been studied to improve process accuracy.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Jingyuan Huang, Markus Voigt, Steffen Wackenrohr, Christoph Ebbert, Adrian Keller, Hans Juergen Maier, Guido Grundmeier
Summary: Surface corrosion and fatigue behavior of pure iron were studied in a modified simulated body fluid, revealing a correlation between surface corrosion progression and fatigue life.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2022)
Article
Chemistry, Physical
Oliver Braetz, Jan Klett, Thomas Wolf, Knuth-Michael Henkel, Hans Juergen Maier, Thomas Hassel
Summary: Hydrogen-assisted cracking is a major challenge in underwater wet welding of high-strength steels. Induction heating can effectively reduce the diffusible hydrogen content in the weld metal.
Article
Biophysics
Julia Augustin, Franziska Feichtner, Anja-Christina Waselau, Stefan Julmi, Christian Klose, Peter Wriggers, Hans Juergen Maier, Andrea Meyer-Lindenberg
Summary: This study compares the performance of two different pore-sized magnesium alloy scaffolds and finds that the larger pore size scaffold has better osseointegration and biocompatibility.
JOURNAL OF APPLIED BIOMATERIALS & FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Susanne Elisabeth Thuerer, Kai Peters, Torsten Heidenblut, Norman Heimes, Julius Peddinghaus, Florian Nuernberger, Bernd-Arno Behrens, Hans Juergen Maier, Christian Klose
Summary: In this study, semi-finished products for the manufacture of hybrid bearing bushings were produced using co-extrusion of coaxially reinforced hollow profiles. The push-out tests showed the shear strengths of hybrid hollow profiles with different material combinations. The influence of force and form closure on the joint zone was determined through shear compression tests. Thin lamellae prepared with a Focused Ion Beam were used for microstructural analysis.
Article
Metallurgy & Metallurgical Engineering
Andreas C. Fromm, Khemais Barienti, Armin Selmanovic, Susanne E. Thuerer, Florian Nuernberger, Hans Juergen Maier, Christian Klose
Summary: Novel aluminum-copper compound castings without oxide layers were developed to enhance thermal conductivity of hybrid components. Metallurgical bonds between aluminum and copper were achieved in an atmosphere comparable to extreme high vacuum created using silane-doped inert gas. The resulting intermetallic phase seams between the joining partners contributed to significantly higher thermal conductivities compared to conventionally joined samples.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Crystallography
Seyed Vahid Sajadifar, Hans Juergen Maier, Thomas Niendorf, Guney Guven Yapici
Summary: The elevated-temperature deformation characteristics and microstructural evolution of a Ti-5V-5Mo-5Cr-4Al alloy were studied under solution-treatment conditions. The dominant softening mechanism was found to be dynamic recovery (DRV), with dynamic precipitation (DPN) occurring only at specific strain rates and temperatures. Void coalescence was observed with increasing deformation temperature and decreasing strain rate. These findings provide insights for the processing of this novel beta titanium alloy.
Article
Materials Science, Multidisciplinary
Hans Juergen Maier, Richard Gawlytta, Andreas Fromm, Christian Klose
Summary: Compound cast heat sinks have advantages over conventionally manufactured ones, but oxide formation and the presence of a brittle intermetallic layer (IMC) pose difficulties. A novel method using silane-doped argon environment was used to suppress oxidation and obtain a high thermal conductivity of 67 W/(m·K) in the compound zone. The IMC layer thickness was kept below the critical value of 3 μm. However, the process window was found to be very narrow, with a critical time period for IMC layer formation on the order of a few 10 s.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Dentistry, Oral Surgery & Medicine
Andreas Greuling, Mira Wiemken, Christoph Kahra, Hans Juergen Maier, Michael Eisenburger
Summary: This study examined the fracture load of zirconia crowns before and after a chewing simulation, with and without trepanning and composite resin repair. The results showed that trepanned and composite-repaired crowns had lower fracture loads compared to unmodified crowns. The analysis also revealed the presence of surface fissures but no cracks that extended from the occlusal to the inner side of the crown.
Article
Engineering, Manufacturing
Khemais Barienti, Stefan Werwein, Sebastian Herbst, Hans Juergen Maier, Florian Nuernberger
Summary: A novel approach is presented to achieve oxygen partial pressures corresponding to extremely high vacuum (XHV) for cold roll bonding. The minimum degree of deformation required to form a solid bond was reduced by up to 35% using XHV-adequate conditions. Adhesion behavior changed during bond formation in XHV-adequate conditions.
MANUFACTURING LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Markus Mlinaric, Hassen Jemaa, Thomas Hassel, Hans Juergen Maier
Summary: The present study analyzes the damage mechanisms that cause premature failure of sapphire water jet orifices using an experimental and finite element modeling approach. The research findings show that the main risk for orifices to fail prematurely is the impact of particles, rather than excessive assembly forces. The experimental data reveals that particles with a diameter of more than 10 μm are critical, and even smaller particles of 2 μm can cause damage to the orifice jewel. To prevent premature failure due to foreign particles, water filtration with a 2 μm mesh is recommended, and further research is needed to focus on the design of the interior cutting head.
Article
Materials Science, Multidisciplinary
Steffen Wackenrohr, Christof Johannes Jaime Torrent, Sebastian Herbst, Florian Nurnberger, Philipp Krooss, Christoph Ebbert, Markus Voigt, Guido Grundmeier, Thomas Niendorf, Hans Jurgen Maier
Summary: Pure iron is a biodegradable implant material with high biocompatibility, and the combination with additive manufacturing allows for flexible adjustment of microstructure to control corrosion and fatigue behavior. This study compares conventional hot-rolled pure iron with pure iron manufactured by electron beam melting, and investigates the differences in microstructure, corrosion behavior, and fatigue properties. The results show significant variations in the studied sample conditions, leading to different corrosion and fatigue responses.
NPJ MATERIALS DEGRADATION
(2022)
Article
Engineering, Mechanical
Miloslav Kepka, Miloslav Kepka Jr, Radovan Minich
Summary: This paper focuses on the fatigue life evaluation of the bodywork of a new articulated electric (battery) bus. The findings resulted in recommendations to improve the operational reliability of a particular vehicle and provided challenges for future research.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
T. Dusautoir, B. Berthel, S. Fouvry, P. Matzen, K-D. Meck
Summary: This study investigates the impact of post-processing treatments on the fatigue limit of additive manufactured Ti-6Al-4V under stress gradients, with a focus on surface integrity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhuofan Xia, Di Wu, Xiaochen Zhang, Jianqiu Wang, En -Hou Han
Summary: The study reveals the surface-initiated rolling contact fatigue (RCF) failure mechanism under heavy load and initial high roughness surface. The results indicate that precursor of collapsed morphology and nanocrystalline layer are the main factors causing lower RCF life with high roughness compared to low roughness surfaces. The spalling failure initiating from low roughness surface under heavy load is strongly dependent on surface plastic deformation.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Daniel Gren, Knut Andreas Meyer
Summary: Rolling contact loading can cause plastic deformation and fatigue cracks. Current rail standards do not consider the effect of plasticity on mechanical behavior. This study proposes a new method for evaluating the fatigue life of deformed material and finds that superimposed compressive axial loads can increase fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
R. Kumar, S. Sanyal, J. Bhagyaraj, E. Hari Krishna, S. Mukherjee, K. Prasad, S. Mandal
Summary: This study investigates the thermomechanical fatigue (TMF) behavior of Timetal 834 alloy under different loading conditions. The results show that the alloy exhibits different cyclic hardening and softening responses at different strain amplitudes. The strain amplitude and phase angle have significant effects on the TMF life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kai Donnerbauer, Tobias Bill, Peter Starke, Ruth Acosta, Bharath Yerrapa, Christian Boller, Klaus Heckmann, Frank Walther
Summary: Given the aging of nuclear power plants, it is important to develop methods for evaluating the integrity of components and structures in nuclear engineering. Suitable nondestructive testing methods can detect material degradation and determine its fatigue life. This study utilized various NDT parameters and scanning electron microscopic methods to explore the relationship between microstructure evolution and NDT data.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Liuyong He, Jiang Zheng, Tianjiao Li, Houkun Zhou, Lihong Xia, Bin Jiang
Summary: This study quantitatively analyzed the effects of precipitates on the deformation mode, cracking mode, and mechanical behavior of WE54 magnesium alloy during low-cycle fatigue. It was found that precipitates promoted the activation of dislocation slip and suppressed the activation of twinning, affecting the cracking mode and mechanical behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Xiangkang Zeng, Conghui Zhang, Wenguang Zhu, Mingliang Zhu, Tongguang Zhai, Xiaomei He, Kangkai Song, Zhuohang Xie
Summary: The cyclic deformation behaviors and damage mechanisms of pure Zr were investigated. The cyclic stress response was mainly influenced by substructure evolutions. Prismatic < a > dislocation slip was identified as the dominant deformation mechanism. Fatigue damage was not only influenced by the initial texture, but also other factors.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Jingyu Yang, Bingbing Li, Yiming Zheng, Gang Chen, Xu Chen
Summary: Heat treatment is used to improve the low-cycle fatigue performance of additive manufactured 316LN stainless steel. The heat-treated material demonstrates initially cyclic hardening followed by softening behavior, and shows a stronger resistance to crack propagation compared to the as-built material, resulting in a longer fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Lang Zou, Dongfang Zeng, Xiong Chen, Jun Li, Hai Zhao, Liantao Lu
Summary: This study investigates the competitive relationship between fretting fatigue and plain fatigue in press-fitted railway axles. By changing the depth of the stress relief groove, the plain fatigue limit and fretting fatigue strength were tested. Detailed information was gathered, and an evaluation methodology integrating finite element simulation and the Modified Wohler Curve Method was established. The study concludes that the optimal groove depth, which balances the anti-fatigue capabilities, depends on the number of test cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Davide Leonetti, Koji Kinoshita, Yukina Takai, Alain Nussbaumer
Summary: This paper investigates the fatigue behavior of non-load-carrying transverse welded steel attachments, including fatigue crack monitoring and fracture surface analysis under constant and variable amplitude loading. A procedure is proposed to obtain a Markov transition matrix based on the measured strain signal and to randomly resample the stress history for variable amplitude fatigue tests.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Zhe Zhang, Bing Yang, Yuedong Wang, Shoune Xiao
Summary: This paper presents a method for designing fatigue life prediction models with small sample sizes by handling limited sample data. The method integrates the equivalent structural stress method with the maximum likelihood estimation method and adds reliability verification, resulting in enhanced goodness of fit, stability, and optimized sample quantity.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Cooper K. Hansen, Gary F. Whelan, Jacob D. Hochhalter
Summary: This paper presents a method to address the computational demand issue of computing FIPs using CPFEM by developing an interpretable machine learning model. Genetic programming is used to evolve interpretable expressions of FIPs from microstructure features, and these models can serve as efficient substitutes for CPFEM and be easily integrated into engineering workflows.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Luca Susmel
Summary: This paper discusses the problem of estimating notch fatigue limits using machine learning. The results show that machine learning is a promising approach for designing notched components against fatigue. The accuracy in estimating the fatigue limit can be increased by increasing the size and quality of the calibration dataset, as well as including additional input features.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
Article
Engineering, Mechanical
Kefeng Gao, Guoqi Tan, Yanyan Liu, Qiang Wang, Qian Tang, Xuegang Wang, Qiqiang Duan, Zengqian Liu, Zhe Yi, Zhefeng Zhang
Summary: Bioinspired architectures have significant effects on material enhancement. This study investigates the fatigue properties of bioinspired ceramic-polymer composites and natural nacre, revealing the close relationship between architectural types, orientations, fatigue performance, and damage mechanisms.
INTERNATIONAL JOURNAL OF FATIGUE
(2024)
