Article
Nanoscience & Nanotechnology
Nikolaj G. Henriksen, Konstantinos Poulios, Marcel A. J. Somers, Thomas L. Christiansen
Summary: Medical devices require unique identification markings for traceability, commonly applied through laser marking directly onto metallic devices. However, the effects of laser marking on material performance are largely unknown. This study investigates the effects of laser marking on common titanium alloys used in the medical industry, revealing surface melting, the formation of cracks, and a significant reduction in fatigue strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Zhichun Zhou, Binbin Jiang, Jianke Qiu, Linglei Zhang, Jiafeng Lei, Rui Yang, Kui Du
Summary: This study investigates the mechanism of crack formation in titanium alloys with lamellar microstructure under low-cycle dwell fatigue. The accumulation of residual dislocations and local tensile stress at the α/β interfaces are found to be the key factors leading to the formation of dwell fatigue cracks.
SCIENCE CHINA-MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
MingDa Zhang, JingXia Cao, Ting Li, ZhanJiang Zhai, Nan Sui, Rongguang Jia, Xu Huang
Summary: This study closely analyzed the local area plastic deformation and dislocation characteristics of the Ti-6Al-2Sn-4Zr-2Mo-0.1Si alloy under low-cycle fatigue and dwell fatigue at room temperature. The results showed inhomogeneous plastic deformation occurred in local areas in the equiaxed primary alpha-phase and the transformed beta-phase. Bands of dislocations were found in some equiaxed primary alpha-grains related to the arrangement direction of alpha+beta colonies in the transformed beta-phase and the crystallographic orientation of the primary alpha-phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Pavel Cizek, Sitarama R. Kada, Nicholas Armstrong, Ross A. Antoniou, Sonya Slater, Peter A. Lynch
Summary: This study investigates the development of dislocation structures in both the a and beta phase of a Ti-6Al-4V alloy under cyclic tensile straining. The results show that deformation occurs exclusively through dislocation slip and deformation twins are not present. The prevalent deformation modes are prismatic and basal glide.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Yidong Xu, Jiahui Qi, John Nutter, Joanne Sharp, Mingwen Bai, Le Ma, W. M. Rainforth
Summary: The study found that Ti-5Mo-Fe-3Sn and Ti-6Al-4V ELI alloys have the capability to repassivate during testing, mainly due to the formation of a greater tribofilm on the worn surface rather than an oxide film. The tribolayer acted as a solid lubricating film, stabilizing the coefficient of friction.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Zhihong Wu, Hongchao Kou, Jinshan Li, Samuel Hemery, Nana Chen, Junhui Tang, Fengming Qiang, Fan Sun, Frederic Prima
Summary: Dwell fatigue failure of titanium alloy components has been a major threat to aircraft safety for the past 50 years. Designing a microstructure with low primary alpha phase content can achieve high strength and low sensitivity to dwell loading. Cracking occurs primarily along preexisting slip bands and twist grain boundaries. Load holding plays a significant role in crack initiation and switching of crack modes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
F. Amann, R. Poulain, S. Delannoy, J. P. Couzinie, E. Clouet, I. Guillot, F. Prima
Summary: The presence of oxygen in commercial titanium and titanium alloys has always caused a ductility loss, but its effect on the macroscopic behavior is still unclear. In this study, the tensile properties of alpha-titanium with varying oxygen contents were investigated. It was found that up to 0.60 wt% of oxygen, no drop in ductility was observed, allowing for exceptional combinations of mechanical properties. The addition of Zr further improved the mechanical properties, surpassing those of the widely used Ti-6Al-4V alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Toni Bogdanoff, Lucia Lattanzi, Mattia Merlin, Ehsan Ghassemali, Anders E. W. Jarfors, Salem Seifeddine
Summary: The study focused on investigating crack initiation and propagation at the micro-scale in heat-treated Al-7Si-Mg cast alloys with varying copper contents. In-situ cyclic testing revealed that the three-nearest-neighbour distance of secondary particles influenced crack propagation, and the Cu content in the alloy enhanced the strength of the alpha-Al matrix. The crack path displayed mixed propagation, with multiple crack initiation points observed along sample thickness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Pavel Cizek, Sitarama R. Kada, Jiangting Wang, Nicholas Armstrong, Ross A. Antoniou, Peter A. Lynch
Summary: The study revealed that in the early stage of cyclic deformation in a Ti-6Al-4V alloy, dislocation structures mainly occurred through dislocation glide, with no evidence of deformation twinning. Prismatic and basal slip were the dominant deformation modes in the alpha phase. Dislocations in the beta phase after deformation mainly displayed a large screw component.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Mechanical
Linglei Zhang, Binbin Jiang, Jianke Qiu, Xumeng Cao, Jiafeng Lei, Rui Yang, Kui Du
Summary: The microstructure of dual-phase Ti alloys plays a crucial role in the nucleation of dwell fatigue cracks, and the probability of crack nucleation varies depending on the grain boundaries. Three dislocation reaction mechanisms were identified for dislocation transmission, and the localization of dislocation slips was found to significantly affect the crack nucleation. These findings provide insights into the quantitative analysis of the microstructure effect on crack nucleation in Ti alloys.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Ying Han, Julius Kruse, Julian M. Rosalie, Jan Radners, Philipp von Hartrott, Birgit Skrotzki
Summary: The fatigue properties of forged aluminum alloy were studied under different stress ratios and aging states. The results showed that overaging significantly reduced the fatigue life of the alloy, which was mainly attributed to the decrease in yield strength and the increase in precipitate radius.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Ignacio Bustos, Marcos Bergant, Alejandro Yawny
Summary: The suitability of infrared thermography (IRT) for estimating the fatigue limit of Ti-6Al-4V produced by electron beam melting (EBM) is assessed. The IRT-based methods are appropriate for machined and polished HIPed EBM specimens, as well as wrought material, but not for other printed material conditions. This is due to the presence of surface roughness and internal defects that hinder surface thermal manifestation in non HIP treated EBM-produced material.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Frank Niessen, Azdiar A. Gazder, David R. G. Mitchell, Elena V. Pereloma
Summary: Microstructure evolution during the 3-point bending of a metastable beta Ti-10V-2Fe-3Al alloy containing 5% alpha was dominated by the formation of deformation-induced alpha '' martensite. The nucleation of alpha '' plates from {580}(alpha '') habit planes at alpha-beta interfaces, impingement with high-angle boundaries, and subsequent thickening led to a build-up of strain energy inducing {130} < 310 >(alpha '') twinning. The study also revealed the activation of {130}< 310 >(alpha '') twinning by alpha '' impingement in a metastable beta matrix.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
C. H. Ng, M. J. Bermingham, D. Kent, M. S. Dargusch
Summary: This study investigates the stability of beta-phase in high heat input Wire Arc Additive Manufacturing of a titanium alloy, finding that the alloy retains its bcc beta-phase during the process due to fast cooling rates and short thermal exposures, resulting in moderate strength and good ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
S. Shyamal, S. R. Das, M. Jaskari, P. Sahu
Summary: This study reports on the microstructure evolution of a coarse-grained high-Mn steel under high-cycle bending fatigue at room temperature. The research found that cyclic hardening almost saturated after 10,000 cycles. Cyclic deformation of austenite resulted in the formation of perfect dislocations, stacking faults, and shear bands. Additionally, a minor amount of α-martensite was observed at the saturation stage.
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)