Article
Chemistry, Physical
Mingyuan Zhang, Taotao Cai, Weiliang Lu, Shili Zheng, Ying Zhang, Yi Zhang
Summary: A novel sintering-deoxygenation process was proposed to fabricate Ti-6Al-4V alloy powder with low-cost and low-grade materials. The sintering shrinkage was affected by temperature, holding time, and raw materials, while the oxygen content in precursors influenced the phase composition and diffraction peaks. The hydrogen-assisted Mg deoxygenation method effectively reduced the oxygen level in the final Ti-6Al-4V powders, meeting the requirements of GB/T 34486-2017.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Mechanical
Arnaud Junet, Alexandre Messager, Arnaud Weck, Yves Nadot, Xavier Boulnat, Jean-Yves Buffiere
Summary: Fatigue specimens of a Ti-6Al-4V alloy containing internal artificial defects were studied. The growth of internal fatigue cracks was monitored in situ by synchrotron X-ray tomography during fatigue tests. Ex situ fatigue tests were also performed on samples with heat treatment or defects exposed to air. The results indicate that internal fatigue cracks grow from the notch in a vacuum environment and exhibit specific fracture surface regions.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Ni Ao, Daoxin Liu, Xiaohua Zhang, Jiwang Zhang, Shengchuan Wu
Summary: This study investigates the effect of initial surface plastic deformation on the fatigue behavior of Ti-6Al-4V alloy. The results show that samples with low plastic deformation severity have higher fatigue strength and accommodate plastic strain by refining the grains.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Yong Jiang, Hairong Mao, Wang Xiaowei, Yilan Lu, Jianming Gong
Summary: The oxygen boost diffusion (OBD) treatment resulted in the formation of a hardened layer with increased surface hardness on Ti-6Al-4V alloy, but led to decreased yield strength, tensile strength, and elongation. The decrease in mechanical properties can be attributed to grain growth at high temperatures during OBD treatment and brittle cracking of the oxygen strengthened layer at low strain.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Muhammad Shamir, Xiang Zhang, Abdul Khadar Syed, Wayne Sadler
Summary: This paper discusses the impact of as-deposited surface conditions on the fatigue strength of an additively manufactured titanium alloy. The study quantifies the local stress concentration caused by surface waviness and conducts fatigue tests under bending loads. The research emphasizes the applicability of predictive methods, with the fracture mechanics approach delivering accurate predictions. The importance of surface machining and polishing depends on the specific application and service load levels. This research demonstrates the effectiveness of the fracture mechanics approach in predicting fatigue life and aiding decision making on surface machining.
Article
Engineering, Mechanical
Weiqian Chi, Wenjing Wang, Lei Wu, Guihua Duan, Chengqi Sun
Summary: Quasi in-situ observation reveals that basal slips, prismatic slips, and pyramidal a-slips are the primary slip types in α grains, while twinning tends to occur in α grains with c-axis nearly parallel to the applied stress in low cycle fatigue regime of additively manufactured Ti-6Al-4V alloy. Slip induces dense dislocation of cells or walls, and deformation twinning leads to subgrains with higher misorientation. Nanograins with low-angle grain boundaries (2 degrees -10 degrees) and {1012} twins are also observed in the very high cycle regime. Slip and deformation twinning both contribute to the formation of nanograins during fatigue loadings.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Review
Materials Science, Multidisciplinary
Hung Dang Nguyen, A. Pramanik, A. K. Basak, Y. Dong, C. Prakash, S. Debnath, S. Shankar, I. S. Jawahir, Saurav Dixit, Dharam Buddhi
Summary: This investigation compares electron beam melting (EBM), selective laser melting (SLM), and directed energy deposition (DED) as additive manufacturing (AM) techniques for producing titanium alloy parts. The study examines the differences in microstructure, tensile properties, porosity, surface roughness, and residual stress among these methods. It concludes that the choice of AM process affects the material's characteristics, and additional treatments such as annealing and stress relief can improve the performance of AM-fabricated parts.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Tianle Li, Lixin Zhong, Huiping Wu, Dayong An, Xifeng Li, Jun Chen
Summary: The microstructure evolution and fatigue crack growth (FCG) behavior of diffusion bonded Ti-6Al-4V titanium alloy under synchronously changed temperature and pressure are systematically investigated. The study shows that outstanding FCG resistance and uncompromised tensile properties can be achieved by optimizing the process parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Automation & Control Systems
Abdolreza Simchi, Frank Petzoldt, Thomas Hartwig, Sebastian Boris Hein, Bastian Barthel, Lea Reineke
Summary: Additive manufacturing of biomedical materials provides opportunities for tissue engineering. However, the fabrication of high-density biomedical-grade titanium alloys with fine microstructure is challenging. This study investigates the effects of powder particle size and 3D printing conditions on the microstructural features and mechanical properties of Ti-6Al-4V alloy, and proposes a particle size distribution design to minimize powder aggregation and achieve high-density green parts.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Polina Metalnikov, Dan Eliezer, Guy Ben-Hamu
Summary: This study found that the susceptibility to hydrogen embrittlement (HE) differs significantly between Ti?6Al?4V alloys prepared by selective laser melting (SLM) and electron beam melting (EBM). The degradation of SLM Ti?6Al?4V in a hydrogen containing environment is likely to occur through hydride formation and cleavage mechanism, while Ti?6Al?4V prepared by EBM is more likely to degrade through hydrogen enhanced localized plasticity (HELP) mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yangyang Sun, I. V. Alexandrov, Yuecheng Dong, R. Z. Valiev, Hui Chang, Lian Zhou
Summary: This study systematically investigates the low cycle fatigue behavior and fracture characteristics of Ti-6Al-4V-0.55Fe alloy with bimodal microstructure. The alloy exhibits continuous softening behavior at both high and low strain amplitudes, with different crack initiation sites and fatigue striation characteristics observed at different strain amplitudes. The LCF life of Ti-6Al-4V-0.55Fe is similar to that of Ti-6Al-4V at high strain amplitudes and much higher at low strain amplitudes due to the extra resistance provided by Fe microalloying.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Huiqing Gu, Li Jiao, Pei Yan, Yifan Song, Zhibo Guo, Tianyang Qiu, Xibin Wang
Summary: This study investigates the fatigue failure mechanism of conformal contact parts. Through experiments and detailed inspections, two types of cracks with different morphologies were found. The first crack initiated on the hole surface and changed direction after propagating to the contact surface, while the second crack initiated at the new fretting boundary and propagated in the loading direction. The dual-crack failure was caused by the propagation of the first type of crack, while the second crack mainly exhibited ductile fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Litton Bhandari, Vidit Gaur
Summary: The fatigue performance of the Ti-6Al-4V alloy built through laser-powder bed fusion was studied. Different post-process methods, including heat treatment, machining, and hot isostatic pressing, were explored to enhance the mechanical and fatigue properties. Machining improved the fatigue properties of the as-built samples, while heat treatment and hot isostatic pressing decreased tensile strength but increased ductility. The fatigue strength was improved with heat treatment and further enhanced by the combination of heat treatment, hot isostatic pressing, and machining.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Waldemar Ziaja, Andrzej Kawalec
Summary: The fatigue life of titanium and titanium alloys is reduced due to dwell sensitivity, which is caused by stress redistribution and time-dependent strain accumulation.
Article
Materials Science, Multidisciplinary
Tianmiao Yu, Fengchun Jiang, Chunhe Wang, Mengxin Cao, Zhenqiang Wang, Yunpeng Chang, Chunhuan Guo
Summary: The Ti-6Al-4V alloy hollow spheres were prepared under different sintering temperatures, showing that density and shrinkage increase while porosity of the shell decreases with higher temperature. The Ti-6Al-4V hollow spheres sintered at 1400 degrees C for 180 minutes exhibited the smallest porosity and largest density.
METALS AND MATERIALS INTERNATIONAL
(2021)
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)