Article
Chemistry, Physical
Shubham Sanjay Joshi, Clement Keller, Eric Hug, Williams Lefebvre
Summary: In this study, the influence of volumetric energy density on the mechanical properties of LPBF manufactured alloys was investigated, and a corresponding model was proposed to explain this influence.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Caleb P. Massey, Cody J. Havrilak, Maxim N. Gussev, Kurt A. Terrani, Andrew T. Nelson
Summary: UAM was successfully utilized to create a three-dimensional component prototype in the Zirconium material system, resulting in grain size refinement and significant localized deformation. Variations in tensile strength in different directions were observed, but overall, it demonstrated the viability of UAM for Zr-based materials.
Article
Materials Science, Multidisciplinary
Peng Li, Zhenqiang Wang, Mingxia Diao, Chunhuan Guo, Jiandong Wang, Chengzhi Zhao, Fengchun Jiang
Summary: Ultrasonic additive manufacturing (UAM) is a solid-state fabrication process that merges metal tapes using ultrasonic energy, resulting in metallurgical bonding. By studying the microstructure and texture evolution of Al-1100 samples, it was found that recrystallization mainly occurs in local interface regions in the upper layers, while dynamic recovery and dynamic recrystallization take place in the bottom layers. The microstructure evolution in the bottom layer is influenced by input energy, demonstrating the effect of ultrasonic energy on the metallurgical bonding regions.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Chemistry, Physical
M. Myshlyaev, G. Korznikova, T. Konkova, E. Korznikova, A. Aletdinov, G. Khalikova, G. Raab, S. Mironov
Summary: In this study, the advanced capabilities of electron backscatter diffraction (EBSD) were used to investigate the role of dynamic recrystallization in the superplastic deformation of a fine-grained material. The results showed that dynamic recrystallization occurred only locally and had a minor contribution to microstructural evolution. Therefore, the preservation of the nearly-equiaxed grain morphology associated with superplasticity cannot be attributed to dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Milad Zohrevand, Mehrdad Aghaie-Khafri, Farnoosh Forouzan, Esa Vuorinen
Summary: This study compares the influence of ultrasonic treatment (UST) on the microstructure of AISI-304 and AISI-316 stainless steels, demonstrating the softening effect and relaxation of residual stresses through microhardness measurements and X-ray diffraction (XRD) peak shifting. Electron and optical microscopy reveal the reduction of deformation twins' fraction under ultrasound, with a proposed mechanism for detwinning using electron backscatter diffraction (EBSD) analysis. The main mechanism of dislocation annihilation due to UST is discussed, with observations of recrystallization phenomenon close to grain boundaries during UST.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Shun Tokita, Cheng Yi Liu, Yutaka S. Sato
Summary: This study investigates the joining of Al/Cu and Al/Ni dissimilar metals using ultrasonic spot welding. The results show that the vibration amplitude and welding time have a greater impact on joint strength than welding pressure. Optimization of welding parameters allows for high-strength joints that fracture at the Al upper plate. Al/Ni bonding requires a narrower range of welding time to achieve higher tensile shear load compared to other material combinations. Texture analysis reveals recrystallized grains with the GOSS orientation in high-strength dissimilar joints.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Crystallography
Gowtham Venkatraman, Leon M. Headings, Marcelo J. Dapino
Summary: This paper investigates the effect of process variables on the microstructure of aluminum 6061 built-up parts using ultrasonic additive manufacturing (UAM). The researchers quantify the degree of recrystallization and develop an energy metric to analyze the welded part. They find that the total energy stored in the weld interface microstructure is about 0.1% of the input energy. The study also compares microstructures of builds prepared under different processing conditions and explores the impact of vibration amplitude and travel speed on the as-built microstructure.
Article
Materials Science, Multidisciplinary
Yulong Zhu, Yu Cao, Qubo He, Rui Luo, Jieke Zhang, Hongshuang Di, Guangjie Huang, Qing Liu, Jun Xiao
Summary: A novel multiscale dynamic standard for electron backscatter diffraction (EBSD) test has been developed using neural network to investigate the recrystallization behavior of Incoloy 925 superalloy during hot deformation. The method analyzes the average grain size distribution and grain orientation spread (GOS) distribution at different stages of dynamic recrystallization and describes the recrystallized and deformed grains based on grain size, length-diameter ratio, GOS, and GOS maximum value. The neural network achieves excellent recognition accuracy for different deformation states by learning the grain characteristics.
MATERIALS CHARACTERIZATION
(2022)
Article
Multidisciplinary Sciences
Nick R. Lutjes, Silang Zhou, Jordi Antoja-Lleonart, Beatriz Noheda, Vaclav Ocelik
Summary: The study analyzes the spherulitic type of 2D crystal growth in thin amorphous Quartz films using electron back-scatter diffraction (EBSD), revealing the characteristics, growth mode, and possible mechanisms of spherulitic Quartz crystal colonies.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
X. X. Zhang, A. Lutz, H. Andra, M. Lahres, W. Gong, S. Harjo, C. Emmelmann
Summary: The ductility of AM Al alloys is crucial in the automotive industry. Post-annealing treatment improves ductility, but the plastic deformation mechanisms of annealed AM AlSi3.5Mg2.5 alloy are unclear. In this study, in-situ neutron diffraction was used to analyze the stress, dislocation density, and crystallite size during deformation, revealing the evolution and establishing physical constitutive equations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Zhi Jia, Lidan Yu, Baolin Wei, Xuan Sun, Yanjiang Wang, Dexue Liu, YuTing Ding
Summary: The effects of temperature and strain rate on the grain orientation and texture of Inconel 617 alloy were analyzed through thermostatic compression experiments. The results showed that DRX in the alloy is influenced by these factors, with discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) events occurring. DRX was found to occur before the peak strain, with a lower critical strain to peak strain ratio due to the influence of twins.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Chunfei Li, Josiah Dubovi, Clay Klein
Summary: This article presents a method to determine facet orientation using SEM and EBSD, which is validated with facets on spherical particles of 20 μm in an Al60Cu25Fe15 alloy. The experimental results show that the surface of the facet is parallel to the {100} lattice plane of a cubic phase.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
X. X. Zhang, D. Knoop, H. Andrae, S. Harjo, T. Kawasaki, A. Lutz, M. Lahres
Summary: Developing a physically-based constitutive model based on the Kocks-Mecking (K-M) model is crucial for predicting the mechanical properties of additive manufacturing Al-Si-Mg alloys, but challenges arise when used for multiphase Al alloys. Through in-situ neutron diffraction, it is found that the K-M model can accurately predict the evolution of dislocation density at the microscale, while the Voce model is more suitable for capturing the changes in average stresses in different phases with plastic strain.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
D. J. Shadle, K. E. Nygren, J. C. Stinville, M. A. Charpagne, T. J. H. Long, M. P. Echlin, C. J. Budrowf, A. T. Polonsky, T. M. Pollock, I. J. Beyerlein, M. P. Miller
Summary: Multi-modal approaches are essential for studying complex materials phenomena, as each characterization technique provides a unique perspective. Sometimes, direct interpretations between techniques are not feasible, and indirect interpretations or signatures are needed for a comprehensive understanding. In this study, signature discovery and electron and synchrotron X-ray characterization techniques were combined to identify regions of intense slip localization in an Inconel-718 alloy undergoing mechanical deformation, revealing intergranular stress states within a grain neighborhood.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Haitao Zhao, Junheng Gao, Guilin Wu, Honghui Wu, Chaolei Zhang, Yuhe Huang, Shuize Wang, Xinping Mao
Summary: Variant pairing is a critical factor in determining the morphology and boundary characteristics of transformation products. The conventional quantification method based on deviation angles may produce biased results. This research proposes a new quantification method using variant indexing and validates it by comparing experimental results.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
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)