Article
Materials Science, Multidisciplinary
Priyanka Agrawal, S. Karthikeyan, Surendra Kumar Makineni, Baptiste Gault, Dipankar Banerjee
Summary: A dynamic strain aging (DSA) regime is established in a near-a titanium alloy through constant strain rate tests, with jogged screw dislocations dominating the dislocation structure within slip bands. The model predicts a DSA peak at 673-723K, with C and Si as solute species responsible for DSA, but dominated by C in this temperature and strain rate regime. Atom probe tomography confirms C and Si segregation at the dislocations, supporting the model.
Article
Nanoscience & Nanotechnology
T. Mahender, M. R. Anantha Padmanaban, I. Balasundar, T. Raghu
Summary: The microstructural features of titanium alloys are influenced by post deformation heat treatment parameters, which in turn affect the mechanical properties. This study evaluated the effects of solution treatment temperature and cooling rate on the microstructure and room temperature tensile properties of an α/β titanium alloy, and attempted to establish the correlation between heat treatment parameters and resulting tensile properties using response surface methodology.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
K. U. Yazar, Amit Bhattacharjee, Satyam Suwas
Summary: This work investigates the dwell fatigue sensitivity of alloy IMI 834, obtained through different thermomechanical processing routes, and shows that the dwell fatigue debit is directly related to the volume fraction of primary alpha grains and texture components.
Article
Engineering, Mechanical
K. U. Yazar, S. Bahl, S. Mishra, V. K. Sahu, A. Bhattacharjee, D. Banerjee, S. Suwas
Summary: This study investigates the normal and dwell fatigue response of a near alpha titanium alloy. Microcracks formed at very early stages of dwell fatigue were found to be the major reason for the decreased fatigue life. The initiation of these cracks was strongly influenced by the local crystallography of the constituent grains. A modified pile up model was used to explain the micromechanisms of crack nucleation in dwell fatigue.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Metallurgy & Metallurgical Engineering
Litton Bhandari, Jalaj Kumar, I. Balasundar, Amit Arora
Summary: The effect of heat treatment on the microstructure and high-cycle fatigue behavior of near-alpha titanium alloy IMI 834 used in aero-engine components has been studied. Significant impact of quench media on high-cycle fatigue life was observed. A fatigue model for the alloy was developed through fractographic investigations and a generalized stress-life model derived from fatigue data.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2021)
Article
Materials Science, Multidisciplinary
Lixia Ma, Min Wan, Weidong Li, Jie Shao, Xiaoning Han, Jichun Zhang
Summary: This study systematically investigated the superplastic deformation microstructure evolution and mechanism of the new near-alpha TNW700 titanium alloy at different strain rates and true strains. Results showed that the alloy exhibited excellent superplastic behavior within a certain strain rate range, with decreasing peak stress and significant strain hardening followed by flow softening. Electron backscatter diffraction and high resolution transmission electron microscopy were used to characterize the microstructure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yali Xu, Liang Ding, Chong Li, Bobo Li, Shuaifeng Zhang, Jinshan Li, Fuyang Gao, Zhijie Sun, Peng Jiang, Minjie Lai
Summary: The deformation behavior of the near-α titanium alloy Ti-6Al-3Nb-2Zr-1Mo with hydrogen was studied at different strain rates. It was found that increasing hydrogen concentration improves ductility at a strain rate of 10(-3) s(-1), but deteriorates ductility at higher strain rates. The presence of hydrogen enhances strain localization at higher strain rates, leading to reduced ductility, while at lower strain rates, hydrogen promotes dislocation mobility and increases ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Syed Mustafa Kazim, Kartik Prasad, Pritam Chakraborty
Summary: This paper develops a crystal plasticity model to capture the dynamic strain aging (DSA) behavior of Timetal-834 alloy at high temperatures. The model successfully predicts the flow stress and DSA behavior, showing good agreement with experimental data. The model incorporates nested models and microstructural analysis to capture the microstructure-dependent DSA.
MECHANICS OF MATERIALS
(2023)
Article
Chemistry, Physical
Sheng-Xian Yi, Zhong-Jiong Yang, Huang-Xin Xie
Summary: This study investigated the deformation behavior of TC21 titanium alloy using high-temperature tensile tests. It was found that the flow stress of the material gradually decreases with an increased strain rate and increases rapidly with an increase in strain during deformation. The established Arrhenius and Radial Basis Function models accurately describe the high-temperature deformation behavior of the material.
Article
Nanoscience & Nanotechnology
Yu Zhou, Ke Wang, Honghui Li, Xin Wen, Renlong Xin
Summary: This study investigates the influence of equiaxed α content (a(e)) and configuration of α lamellas on the deformation mechanism and tensile properties of near-α titanium alloy. The bimodal microstructures (BMs) comprised of a(e) and parallel α lamellas (a colony) and basket-weave α lamellas (a basketweave) are denoted as BMC and BMB, respectively. With decreasing content of a(e), BMB shows higher strength and lower elongation reduction compared to BMC. Under the same content of a(e), BMB exhibits higher strength and better elongation than BMC. The deformation mechanisms of fully equiaxed microstructure (FEM), BMC, and BMB are investigated, revealing that prismatic slip is the dominant slip system and dislocation multiplication of prismatic slip dominates all a(e) grains. Basket-weave microstructure shows better slip transfer restraint and absence of continuous a(GB), leading to higher strength and better elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Hyeon Jin Lee, Jae Hyuk Kim, Chan Hee Park, Jae-Keun Hong, Jong-Taek Yeom, Taekyung Lee, Sang Won Lee
Summary: The deformation mechanisms of an alpha ''-martensitic Ti-8Mo alloy were investigated using ex-situ electron microscopy tensile tests. It was found that two deformation twins, {110}(11 over bar 0)alpha '' and {130}(3 over bar 10)alpha '' are simultaneously generated through two pathways: (1) direct from primary laths and (2) via reorientation twins. The generation of deformation twinning is strongly influenced by crystal orientation and follows Schmid's law. The dominant twinning in alpha '' martensite was determined by comparing the shuffle magnitudes calculated from the lattice parameter and the magnitude of lattice modulation. {110}(11 over bar 0)alpha '' and {130}(3 over bar 10)alpha '' twins are activated simultaneously in Ti alloys with a low beta-stabilizer content, such as Ti-8Mo alloy.
Article
Materials Science, Multidisciplinary
Shun Guo, Wang Ding, Huihui Zhang, Weiqun Lu, Guanglei Liu, Haixia Liu, Xiaonong Cheng, Xinqing Zhao
Summary: In this study, a Ti-Nb alloy with large near-linear recoverable strain was designed to investigate the physical mechanisms responsible for high near-linear elastic deformability. The experimental results showed that the high near-linear elastic deformability of this alloy is attributed to a combined effect of large inherent elastic deformation and a reversible SIMT.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Lixia Ma, Min Wan, Weidong Li, Jie Shao, Xuepiao Bai, Jichun Zhang
Summary: Research on the high temperature titanium alloy TNW700 revealed significant work hardening behavior, with varying trends in work hardening coefficient and critical strain between flow hardening and softening with respect to strain rate and deformation temperature. The alloy showed excellent superplasticity at 900-950 degrees C but poor superplasticity at 975 degrees C. The study on superplasticity is crucial for optimizing the forming process of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Han Sun, Wen Zhang, Yakun Xu, Qi Li, Xincun Zhuang, Zhen Zhao
Summary: This study observed the evolution of Portevin-Le Chatelier (PLC) serrations in 6061-O aluminum alloy under ultra-low-frequency vibration (ULFV)-assisted tension. The distribution of stress fluctuations in the time domain and the propagation of strain-localized bands in the space domain were recorded to characterize the PLC phenomenon. The study found that the amplitude and mode of ULFV can influence the PLC effect.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Min Cheng, Bingbing Yu, Ruipeng Guo, Xiaohui Shi, Lei Xu, Junwei Qiao, Rui Yang
Summary: In this study, a near alpha high temperature titanium alloy was produced and joined using electron beam welding. The results indicate that the microstructure and mechanical properties of the welded joints are influenced by annealing treatment, with residual stress and tensile properties reaching or exceeding those of the base metal.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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)