Article
Materials Science, Multidisciplinary
Pengfei He, Zhengying Wei, Yongchao Wang
Summary: In this paper, a novel droplet + arc additive manufacturing technique is proposed for fabricating particle-reinforced Al matrix composites parts. Experimental results show that the interface pore defects are affected by the wettability between particle and liquid Al matrix. Additionally, the transition of grain size can be achieved by particle implantation.
Article
Materials Science, Multidisciplinary
Gabriel Demeneghi, Baxter Barnes, Paul Gradl, David Ellis, Jason R. Mayeur, Kavan Hazeli
Summary: This study investigates the size effects of HIP LP-DED Copper-Chromium-Niobium alloy, specifically GRCop-42, on microstructure, hardness, surface metrology, and mechanical response. Results indicate directional and size effects in tensile loading response, with variations observed between specimens orientation and thickness.
MATERIALS & DESIGN
(2022)
Article
Automation & Control Systems
Prveen Bidare, Aldi Mehmeti, Amaia Jimenez, Sheng Li, Chris Garman, Stefan Dimov, Khamis Essa
Summary: This paper analyzes the influence of process parameters on the porosity, crack formation and microstructure of additively manufactured CM247LC nickel-based alloy. It demonstrates the feasibility of using the direct laser deposition (DLD) process to manufacture crack-free and low-porosity CM247LC samples. The study also shows that good bonding between Inconel 718 substrate and deposited layers can be achieved by using specific laser power, scanning speed, and powder flow rates.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Xinxin Zhang, You Lv, Sihan Tan, Zehua Dong, Xiaorong Zhou
Summary: This study investigated the microstructure and corrosion behavior of wire arc additive manufactured (WAAM) AA2024 alloy thin wall structure. It was found that localized corrosion primarily occurs at the melt pool border with a high volume fraction of eutectic S-phase, leading to localized corrosion initiated by de-alloying.
Article
Engineering, Mechanical
Aditya Pandey, Vidit Gaur
Summary: This research studied the effect of inter-layer dwell time and fabrication path strategy on the fatigue properties of wire-arc additively manufactured (WAAM) IN718 alloy. The results showed that the bidirectional fabrication strategy improved mechanical properties compared to the uni-directional strategy. Increasing the dwell time improved the quality of the fabricated part and also improved mechanical properties. Fatigue lives were higher at higher dwell times due to fewer porosities. The observed effects were attributed to reduced heat accumulation, porosities, and residual stresses at higher dwell times.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Civil
Shengchong Ma, Xi Chen, Meng Jiang, Bingchen Li, Zhiyuan Wang, Zhenglong Lei, Yanbin Chen
Summary: This study develops a wire-based process of laser-arc hybrid additive manufacturing (LHAM) to fabricate aluminum alloys containing Sc. Compared with wire and arc additive manufacturing (WAAM) under two processing conditions, LHAM shows significantly improved surface quality and refined microstructure. LHAM also exhibits a higher and more stable microhardness distribution and exceptional elongation, indicating less anisotropy in mechanical properties.
THIN-WALLED STRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
C. Paoletti, E. Santecchia, M. Cabibbo, E. Cerri, S. Spigarelli
Summary: AlSiMg alloys produced by additive manufacturing exhibit a complex microstructure, and a physically-based set of constitutive equations can predict their mechanical properties. Analysis of experimental data shows excellent correlation between model curves and experimental results.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Pengfei He, Zhengying Wei, Yongchao Wang, Minbo Jiang, Chen Ma, Xueli Chen, Xuhui Lai
Summary: In this paper, a novel droplet + arc additive manufacturing (DAAM) method was proposed for building high quality and high efficiency aluminum alloy components. A special droplet generation system (DGS) was designed to replace the traditional wire feeding system, allowing the material addition process and the arc heat input process to function independently. The experimental results demonstrated that the DAAM process improved the continuity of the deposition process and significantly reduced the harmful impact of droplets on the molten pool. In addition, the DAAM process showed great inclusiveness of droplet falling deviation and successfully fabricated multi-layer thin-wall components and ring-shaped structures.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Kavan Hazeli, Daniel June, Prathmesh Anantwar, Behzad Bahrami Babamiri
Summary: This study explores the relationship between microstructure, topology, and their combined effect on the behavior of additively manufactured Copper-Chromium-Niobium alloy (GRCop-84) lattice structures under quasi-static and dynamic conditions. The findings indicate that both microstructure and topology play a role in determining the mechanical properties, such as compressive yield strength and energy absorption abilities, of the lattice structures.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Yukyeong Lee, Eun Seong Kim, Sangeun Park, Jeong Min Park, Jae Bok Seol, Hyoung Seop Kim, Taekyung Lee, Hyokyung Sung, Jung Gi Kim
Summary: The optimal line energy density plays a crucial role in enhancing both the strength and ductility of additively manufactured Ti-6Al-4V alloy, while an excessively high energy density can negatively impact both strength and ductility. The extent of fusion and the size of prior-beta grains are important factors affecting the mechanical properties of the alloy.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Y. Chew, Z. G. Zhu, F. Weng, S. B. Gao, F. L. Ng, B. Y. Lee, G. J. Bi
Summary: In this study, bulk Fe49.5Mn30Co10Cr10C0.5 interstitial multicomponent alloy was fabricated using laser aided additive manufacturing, showing excellent mechanical properties and cellular structures. Tensile tests demonstrated superior strength of the alloy at low temperatures, with almost no twinning observed in fractured samples.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Kaijie Song, Zidong Lin, Yongzhe Fa, Xuefeng Zhao, Ziqian Zhu, Wei Ya, Zhen Sun, Xinghua Yu
Summary: High-strength, low-alloy (HSLA) steel, known for its combination of high strength and toughness, low cost, and good formability, has gained a lot of attention in the manufacturing industry. Wire and arc additive manufacturing (WAAM) technology allows for the rapid prototyping of HSLA steel parts. This study focused on a 26-layer HSLA steel component fabricated using the WAAM technique. The results showed that the deposited wall exhibited a microstructure consisting mainly of acicular ferrite, with longitudinal dendrites growing preferentially along the deposition direction. Furthermore, the mechanical properties of the HSLA steel parts deposited using WAAM technology were found to meet the performance requirements.
Article
Materials Science, Multidisciplinary
Ercan Cakmak, Philip Bingham, Ross W. Cunningham, Anthony D. Rollett, Xianghui Xiao, Ryan R. Dehoff
Summary: This study focuses on the non-destructive characterization of additively manufactured parts using x-ray computed tomography. It compares laboratory XCT and synchrotron-based XCT, concluding that laboratory XCT is a compelling alternative for static defect characterization in AM parts, while synchrotron-based techniques offer unmatched performance for dynamic and sub-micron studies.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yuhan Wei, Fencheng Liu, Fenggang Liu, Dong Yu, Qifan You, Chunping Huang, Zhitai Wang, Wugui Jiang, Xin Lin, Xiaoan Hu
Summary: This paper discusses the influence of arc oscillation on the porosity, microstructure, and mechanical properties of 2319 aluminum alloy samples. The results show that arc oscillation can improve the shape of the molten pool, enhance fluidity, and change the thermal distribution and growth direction of columnar crystals, thereby reducing grain size and pore proportion. After using spiral arc oscillation and asymmetrical trapezoid arc oscillation patterns, the volume fraction of pores decreased to 1.09% and 1.22%, respectively, and the size of pores was mainly smaller than 40 mm. Arc oscillation improved the tensile strength and plasticity in the vertical direction, but its effect on horizontal tensile strength was not significant. After solid solution-aging treatment, the tensile strength of the sample with spiral arc oscillation pattern increased to 277 MPa, with a cross-section reduction of 3.6%.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yabo Hu, Jizheng Yao, Min Ao, Chaofang Dong
Summary: A low carbon CoCrMoW alloy was manufactured through laser beam powder bed fusion technique, with nanoscale intermetallic Co-3(Mo,W)(2)Si precipitates dispersed uniformly and showing improved corrosion resistance compared to the wrought alloy.
Article
Nanoscience & Nanotechnology
Reza Ghiaasiaan, Nabeel Ahmad, Paul R. Gradl, Shuai Shao, Nima Shamsaei
Summary: This study compares the effects of different heat treatment temperatures on Haynes 282 and finds that even with larger gamma' precipitates, low temperature heat treatment can achieve comparable tensile properties to conventional heat treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Arash P. Jirandehi, M. M. Khonsari, S. Guo, Paul Gradl
Summary: The efficacy of a newly developed microstructure-sensitive fatigue framework for additively manufactured materials is evaluated at different environmental temperatures. C-18150 copper alloy samples fabricated by Laser Powder Bed Fusion (L-PBF) are subjected to fatigue testing at room temperature, 204 degrees C, and 426 degrees C. The damage representative, plastic strain energy, is studied using cyclic stress-strain hysteresis loop area measurements and analyzed with a microstructure-sensitive algorithm. A thermodynamics-based framework is employed to calculate Fracture Fatigue Entropy (FFE) for assessing the materials' fatigue performance. The results from the hysteresis loop and microstructure-sensitive method show consistent trends and magnitudes.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Paul Gradl, Darren C. Tinker, Alison Park, Omar R. Mireles, Marissa Garcia, Ryan Wilkerson, Christopher Mckinney
Summary: This article provides an overview of considerations for selecting metal additive manufacturing (AM) processes for aerospace components. It discusses various attributes such as geometric considerations, metallurgical characteristics, cost basis, post-processing, and industrialization supply chain maturity. The information was compiled from literature reviews, internal NASA studies, and academic and industry partner studies and data. The studies conducted experiments on multiple AM components and samples to evaluate material and geometric variations, alloy characterization, pathfinder component development, and qualification approaches.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Nanoscience & Nanotechnology
Joseph Indeck, David Cereceda, Jason R. Mayeur, Kavan Hazeli
Summary: The use of machine learning techniques in mechanics and materials research can enhance the understanding of microstructure-property relationships. In this study, various machine learning techniques were employed to analyze mesoscopic deformation mechanisms and gain insights into void nucleation in polycrystalline metals. The results showed that unsupervised clustering analysis combined with a K-nearest neighbor classifier accurately characterized slip transmission and identified grains with fatigue-induced voids. It was also discovered that the inclusion of partially-active slip systems was more appropriate for predicting slip activity than the binary classification. The study concluded that grains containing fatigue-induced voids were more likely to be surrounded by grains with orientations that inhibited slip transmission according to the Lee Robertson-Birnbaum criteria. Furthermore, it was demonstrated that smaller datasets using limited simulation results could yield similar outcomes when additional physical descriptors for the slip system activity were incorporated.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
Behzad Bahrami Babamiri, Jason R. Mayeur, Kavan Hazeli
Summary: This article presents a methodical approach to optimize both microstructure and topology of additively manufactured metallic lattice structures (AMLS) in order to improve their mechanical properties. By calibrating crystal plasticity model parameters and considering different microstructures and topologies, the structural integrity of AMLS can be significantly enhanced.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Kavan Hazeli, Daniel June, Prathmesh Anantwar, Behzad Bahrami Babamiri
Summary: This study explores the relationship between microstructure, topology, and their combined effect on the behavior of additively manufactured Copper-Chromium-Niobium alloy (GRCop-84) lattice structures under quasi-static and dynamic conditions. The findings indicate that both microstructure and topology play a role in determining the mechanical properties, such as compressive yield strength and energy absorption abilities, of the lattice structures.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Jingqi Zhang, Yingang Liu, Behzad Bahrami Babamiri, Ying Zhou, Matthew Dargusch, Kavan Hazeli, Ming-Xing Zhang
Summary: In this study, a series of titanium gyroid lattice structures were designed and additively manufactured by laser powder bed fusion (L-PBF) to enhance specific energy absorption. Experimental results showed that tailoring the sheet thickness gradient and adding MgO nanoparticles enabled continuous hardening behavior and high strength, resulting in approximately 63% improvement in specific energy absorption for the uniform gyroid lattice structure. Finite element analysis based on a modified volumetric hardening model provided insights into the underlying mechanism governing continuous hardening behavior. This study demonstrates the potential of architecture engineering and material design in creating high-performance lightweight lattice structures using L-PBF.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Gabriel Demeneghi, Baxter Barnes, Paul Gradl, David Ellis, Jason R. Mayeur, Kavan Hazeli
Summary: This study investigates the size effects of HIP LP-DED Copper-Chromium-Niobium alloy, specifically GRCop-42, on microstructure, hardness, surface metrology, and mechanical response. Results indicate directional and size effects in tensile loading response, with variations observed between specimens orientation and thickness.
MATERIALS & DESIGN
(2022)
Article
Multidisciplinary Sciences
Timothy M. Smith, Christopher A. Kantzos, Nikolai A. Zarkevich, Bryan J. Harder, Milan Heczko, Paul R. Gradl, Aaron C. Thompson, Michael J. Mills, Timothy P. Gabb, John W. Lawson
Summary: We developed a new oxide-dispersion-strengthened NiCoCr-based alloy, GRX-810, using a model-driven alloy design approach and laser-based additive manufacturing. This alloy shows significant improvements in strength, creep performance, and oxidation resistance compared to traditional polycrystalline wrought Ni-based alloys.
Article
Engineering, Civil
Arash Soltani-Tehrani, Poshou Chen, Colton Katsarelis, Paul Gradl, Shuai Shao, Nima Shamsaei
Summary: The research investigated the feasibility of reusing NASA HR-1 powder for LP-DED of thin-walled structures. Reusing the powder five times slightly reduced fine particles and increased mean particle size, but had negligible effects on powder rheological properties. Reused powder exhibited similar flow behavior, leading to no variation in surface roughness, defects' size, microstructure, and mechanical properties of the as-deposited parts. Specimen orientation, parallel or perpendicular to building direction, influenced tensile ductility and fatigue resistance due to surface micro-notches and crack initiation.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Aerospace
Paul Gradl, Omar R. Mireles, Colton Katsarelis, Timothy M. Smith, Jeff Sowards, Alison Park, Poshou Chen, Darren C. Tinker, Christopher Protz, Tom Teasley, David L. Ellis, Christopher Kantzos
Summary: NASA has been working on the development of metal additive manufacturing (AM) for space applications since the late 2000's. They have focused on understanding the AM processes, developing standards, fabricating components, and integrating them into propulsion development and flight applications. NASA has successfully matured commonly used aerospace alloys through detailed AM process characterization and testing. They are also working on developing optimized alloys using integrated computational materials engineering (ICME) for high-performance applications.
Article
Engineering, Mechanical
Nabeel Ahmad, Reza Ghiaasiaan, Paul R. Gradl, Shuai Shao, Nima Shamsaei
Summary: This study investigated the low cycle fatigue behavior of laser powder bed fused Haynes 282 at temperatures ranging from -195 to 871 degrees C. The results showed that the presence of surface micro-notches and volumetric defects in Non-HIP/UM specimens led to shorter fatigue lives compared to HIP/M ones at temperatures below 649 degrees C. However, the difference attenuated above 649 degrees C due to increased plastic deformation and oxidation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Manufacturing
Victoria Luna, Leslie Trujillo, Ariel Gamon, Edel Arrieta, Lawrence E. Murr, Ryan B. Wicker, Colton Katsarelis, Paul R. Gradl, Francisco Medina
Summary: This study examines and compares the microstructures, mechanical properties, and Vickers microindentation hardnesses for additively manufactured samples built by different AM processes. The study finds that high-temperature heat treatment of AM process-built samples can improve their microstructures and mechanical properties. The heat-treated samples exhibit similar grain structures and hardnesses, independent of the AM process used.
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2022)
Article
Engineering, Industrial
Paul R. Gradl, Angelo Cervone, Eberhard Gill
Summary: Additive Manufacturing provides new opportunities for thin-wall microchannel heat exchangers in aerospace and industrial applications. Laser Powder Directed Energy Deposition is an AM process that enables large-scale manufacturing of such heat exchangers. This study investigates the surface texture of LP-DED samples and its impact on friction factor and pressure drop within a heat exchanger, providing valuable insights for fluid flow applications.
ADVANCES IN INDUSTRIAL AND MANUFACTURING ENGINEERING
(2022)
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)