Article
Materials Science, Multidisciplinary
Lili Zhang, Zong-wei Ji, Jiuzhou Zhao, Jie He, Hongxiang Jiang
Summary: This study investigated the factors affecting eutectic Si modification in Al-Si hypoeutectic alloy with the addition of Na, Sr, Eu and Yb, and found that the modification effect is determined by element concentration in eutectic Si, solubility of modifying element M in alpha-Al, and interaction energy parameter of Al (or Si) and modifying element. A good modification is achieved by M of limited solubility in alpha-Al and a moderate interaction energy parameter of Si (or Al) and M. The results were verified by previous experimental results, and the effect of cooling rate on modification was also discussed.
Article
Materials Science, Multidisciplinary
G. Vasudevan, R. Anbukkarasi, Hari Sanil, M. Ravi
Summary: The effects of casting method (squeeze casting and gravity die casting) and alloy modification (addition of Sr) on the secondary dendrite arm spacing (SDAS) and eutectic Si size of Al-Si binary alloy were investigated. It was found that Sr addition and changing the casting method from gravity die casting to squeeze casting technique reduced the SDAS and eutectic Si size. The Sr modified and squeeze cast alloy showed improved mechanical properties compared to the unmodified gravity die cast alloy.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yao Xiao, Jicheng Wang, Qianyu Deng, Li Feng, Dianming Peng, Hui Feng, Kai Li, Yong Du
Summary: Cast defects are common and hard to eliminate without deformation in cast alloys, degrading their mechanical properties. The addition of Sn was found to have a deleterious effect on Al-Si alloy's mechanical properties, forming amorphous Sn oxides near alumina film or enclosures. The high Sn content trapped in enclosures resulted in more shrinkage pores during solidification, leading to cracks along these pores and amorphous Sn oxides, deteriorating the mechanical properties. This study suggests not adding Sn to various cast Al alloys.
Article
Chemistry, Physical
Byungjoo Kim, Jihoon Hwang, Yongho Park, Youngcheol Lee
Summary: This study found that adding TiB2 particles can effectively modify the eutectic Al + Mg2Si phases in aluminum alloys, and proposed a new mechanism for TiB2 particles to promote Mg2Si phase modification.
Article
Nanoscience & Nanotechnology
Qing Cai, Ewan Lordan, Shihao Wang, Guangyu Liu, Chamini L. Mendis, Isaac T. H. Chang, Shouxun Ji
Summary: Microstructures and mechanical properties of near-eutectic and hypoeutectic Al-Si-Ni-Fe-Mn alloys were studied under as-cast condition. The alloys exhibited primary intermetallic phases, with different precipitates and lattice parameters. These alloys showed excellent mechanical properties at high temperatures, making them suitable for industrial applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Peerawit Chokemorh, Phromphong Pandee, Suwaree Chankitmunkong, Ussadawut Patakham, Chaowalit Limmaneevichitr
Summary: In this study, the refinement mechanism of primary and eutectic Si morphologies in hypereutectic Al-Si alloys was investigated by adding P and Ce. It was found that the addition of P-Ce significantly refined the primary and eutectic Si morphologies, resulting in increased tensile strength and elongation of the alloy. Furthermore, the wear resistance of the alloy was improved.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Tiffany Wu, A. Plotkowski, A. Shyam, David C. Dunand
Summary: This study investigates the microstructures, thermal stability, ambient temperature strengthening, and creep resistance of three ternary Al-Ce-Ni alloys. The results show that the high volume fraction of intermetallic phases and extremely fine eutectic spacing/fiber diameter contribute to high ambient strengthening and enhanced creep resistance. The alloys also exhibit coarsening resistance up to 425 degrees C and remain substantial creep resistance at 300 degrees C, making them excellent materials for high temperature applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
A. M. Samuel, M. H. Abdelaziz, H. W. Doty, F. H. Samuel
Summary: The study investigated the spheroidization process of 356 and 413 alloys under different solutionizing treatments. Sr-modified 356 alloy showed nearly complete spheroidization after 1200 h, while non-modified 356 alloy and Sr-modified 413 alloy exhibited partial fragmentation. The observations from deeply etched samples contradicted those from polished samples, highlighting the challenges of achieving complete spheroidization under industrial conditions.
INTERNATIONAL JOURNAL OF METALCASTING
(2022)
Article
Materials Science, Multidisciplinary
Jianbo Sun, Guangkai Zeng, Dewang Rao, Yuchen Wang, Yiwang Yang, Liwen Pan, Zhiliu Hu
Summary: In this study, Zr and V were added individually and jointly to Al-12.5Si-1Cu alloy to develop heat-resistant aluminum alloys. The combined addition of Zr and V resulted in a substantial improvement in high-temperature tensile strength, with the increase of eutectic silicon aspect ratio as the main cause leading to improved strength, while primary silicon and coarse precipitates were detrimental to high-temperature properties.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Huilan Huang, Wang Li, Chuanbo Hu, Lipeng Ding, Zhihong Jia, Nan Zhou
Summary: The present study reveals the valuable role of Zr on the elevated temperature creep resistance of Al-7Si-0.3Mg alloy. By introducing novel Zr-containing dispersoids during solutionizing, the creep rate is significantly reduced and the time-to-fracture is extended.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yinling Jin, Hongze Fang, Shu Wang, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: The addition of Eu can modify the eutectic Mg2Si phase, improving the mechanical properties of near-eutectic Al-Mg2Si alloys. Tensile properties are significantly enhanced when the Eu content is 0.05%, but they decrease with further increasing Eu content, indicating an over-modification effect.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Qun Luo, Xingrui Li, Qian Li, Lingyang Yuan, Liming Peng, Fusheng Pan, Wenjiang Ding
Summary: The addition of La element to Al-Si alloy has significant improvement effects, achieving refinement of α-Al grains and modification of eutectic Si simultaneously.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Wanwu Ding, Lumin Gou, Liwen Hu, Haixia Zhang, Wenjun Zhao, Jinyuan Ma, Jisen Qiao, Xiaochun Li
Summary: This paper investigates the effects of a novel Al-3Ti-4.35La master alloy on the morphology of eutectic Si and mechanical properties of hypoeutectic Al-7Si alloy, and reveals its modification mechanism. The results show that the addition of Al-3Ti-4.35La master alloy can transform the eutectic Si phase into a fine fiber and partial granular structure, significantly enhancing the ultimate tensile strength and elongation of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Manufacturing
Pedro Augusto Bottlender Machado, Jose Maria do Vale Quaresma, Amauri Garcia, Carlos Alexandre dos Santos
Summary: The machinability of Al-Si-Mg alloys under as-cast and heat-treated conditions was investigated. The results showed that the heat-treated alloys exhibited more stable machinability behavior due to improved microstructure and hardness.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Materials Science, Multidisciplinary
T. K. Akopyan, N. A. Belov, N. V. Letyagin, F. O. Milovich, A. S. Fortuna
Summary: The addition of a trace amount of indium can increase the hardness of A319-type aluminum alloy and form spherical super nanoprecipitates, leading to an increased hardening magnitude. The study found that these precipitates may be composed of the theta' phase, pure silicon, and indium.
MATERIALS TODAY COMMUNICATIONS
(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)