Article
Chemistry, Physical
Chaoyu Chen, Mingxu Sun, Zhi Cheng, Yao Liang
Summary: The influence of different short-time reheating temperatures on the microstructure and shear strength of Cu/Au80Sn20/Cu solder joints during electronic packaging was studied. It was found that high-quality solder joints were obtained at 30 degrees C for 3 min. The microstructure of the joint interface showed little change with an increase in the multiple reflow temperature. The eutectic structures in the solder matrix became coarsened and transformed from lamellar to bulk morphology. The shear strength of the joints decreased slightly with reheating temperatures lower than 200 degrees C and significantly decreased with reheating temperatures above 250 degrees C.
Article
Materials Science, Multidisciplinary
Gabriel Israel Vasquez Hernandez, Marco Aurelio Gonzalez Albarran, Eduardo Rodriguez de Anda, Juan Carlos Diaz Guillen, Omar Jimenez Aleman, Karla Guadalupe Portilla Zea, Luis Olmos
Summary: SiC + ZrB2 dispersed particles dissolved at high temperatures, stabilizing the β phase and reducing outward aluminum diffusion. Silicon acted as a reactive element that promoted the rapid formation and stabilization of α-Al2O3 (TGO), limiting inward oxygen diffusion and resulting in thinner TGO layers, thereby increasing oxidation lifespan.
Article
Chemistry, Physical
Jiayi Xiang, Faqin Xie, Xiangqing Wu, Shaoqing Wang
Summary: The oxidation behavior of a Ti2AlNb based alloy was found to be relatively good, while it suffered severe hot corrosion attack when coated with a salt mixture of NaCl-Na2SO4. The interaction between the TiO2 + Al2O3 layers and NaNbO3 layers in the corrosion product scale accelerated the growth of the scale. The cracking and spalling of the scale were caused by the escape of gaseous chlorides, fast growth of the scale, and the coefficient of thermal expansion (CTE) mismatch between TiO2 and NaNbO3.
Article
Chemistry, Physical
Shiqian Liu, Xin Fu Tan, Stuart D. McDonald, Qinfen Gu, Syo Matsumura, Kazuhiro Nogita
Summary: The research revealed that the concentration of Ni has a significant impact on the interfacial reactions between liquid Ga and Cu-xNi substrates, affecting the type of intermetallics formed and their growth rate, as well as the strength of the joints. The study delves into the mechanisms of intermetallic growth, joint strength, crystallography of the intermetallics, and methods of joining.
Article
Materials Science, Multidisciplinary
A. Ingle, S. Heurtault, F. Hafid, J. Said, A. Proietti, G. Odemer, M. Dehmas, C. Blanc
Summary: The study found that an increase in the density of high-angle grain boundaries can decrease the corrosion current of commercially pure Al alloy in chloride-sulphate solution, while intermetallic particles may act as pit initiation sites. In addition, the propagation of pits is strongly influenced by the density of high-angle grain boundaries.
Article
Chemistry, Physical
Yen Ngoc Nguyen, Kyung-Tae Kim, Soo-Ho Chung, Injoon Son
Summary: This study investigated the impact of different diffusion barriers (EN and ENEPIG) on the performance of Bi2Te3-based thermoelectric modules, showing that the ENEPIG-coated modules had better wettability and higher output power. Additionally, the ENEPIG-coated modules exhibited lower internal resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Mechanics
Juan Manuel Costa Miscione, Bruna Niccoli Ramirez, Claudio Geraldo Schon
Summary: A damage evolution model based on fracture and damage mechanics, considering Lode dependence, is proposed. The model accurately predicts the fracture characteristics in ductile fractured specimens and chip morphology in metal cutting.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Hyeon Jeong Park, Dong Yong Park
Summary: In this study, an image processing method was developed to quantitatively identify MoxBy and Mox1Crx2By phases on the joints between Inconel617 and MBF30, and an image processing algorithm was developed based on segmentation to classify the distributed phases from the regions of the base metal. The validity of the algorithm was evaluated by confirming the existence of the phases from the EPMA maps and directly verified by TEM and XRD analyses. The effects of the transient liquid phase bonding temperature on the widths of the distributed phases were quantitatively analyzed.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Ryotaro Nishi, Fei Shen Ong, Hirobumi Tobe, Eiichi Sato
Summary: This paper reports the pressure reduction effect of the transient liquid phase bonding (TLPB) technique in sound Ti-6Al-4V similar joints. Adjusting the holding time and bonding pressure can achieve microstructural homogenization and void closure, resulting in sound joints with bending strength above the yield strength of the material. Low-pressure TLPB is recommended for cost reduction and ensuring shape accuracy of complex geometry components.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Chihiro Iwamoto, Yoshimi Ohtani, Kensuke Hamada
Summary: In-situ transmission electron microscopy (TEM) was used to investigate the microstructure evolution during ultrasonic bonding. It was observed that numerous nanoparticles were generated and moved randomly between the contact regions of the aluminum sheets. These nanoparticles filled the gaps between the joining partners, facilitating the formation of the bonded interface. The in-situ TEM observation technique provides a new approach to study ultrasonic bonding process.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Ceramics
Artemiy Aborkin, Dmitriy Bokaryov, Dmitriy Babin, Alexey Zalesnov, Kirill Khorkov, Evgeny Prusov, Alexey Elkin, Anatoly Ob'edkov, Ilya Vilkov, Igor Perezhogin, Mikhail Alymov
Summary: Metal matrix composites based on 5049 aluminum alloy reinforced with multi-walled carbon nanotubes (CNTs) coated with nonstoichiometric cubic tungsten carbide were obtained by powder metallurgy. High-temperature annealing at 500-600 degrees C for 0.5 h was carried out for the synthesized composites, which resulted in the evolution of the structural-phase composition and the change in the microhardness and Young's modulus of the bulk composite. Annealing above 525 degrees C led to a solid-state interfacial reaction between the ceramic coating on CNTs and the matrix material, resulting in the in-situ formation of the WAl12 intermetallic compound and Al4C3 nanorods.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Zhuo Chen, Meili Cai, Zhen Liu, Yiming Chen, Xinyao Yi, Fuliang Wang, Wenhui Zhu
Summary: This study investigated the role of early-stage interfacial diffusion in bonding by using a special electrodeposited Ni microcone layer to bond with solder at a solid-state temperature of 200 degrees C, revealing the sequential formation of an amorphous layer and intermetallic compound (IMC) grains upon initial contact. A low bonding temperature of 100 degrees C resulted in poor interfacial adhesion and no visible product of diffusion, indicating that the interfacial diffusion product can be an effective indicator of bimetal bonding for low-temperature interconnection processes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Qiaoling Chu, Lin Zhang, Tuo Xia, Peng Cheng, Jianming Zheng, Min Zhang, Jihong Li, Fuxue Yan, Cheng Yan
Summary: The microstructure and mechanical properties of the Fe-Nb dissimilar joint were investigated using nanoindentation, revealing variations in hardness and fracture toughness among different phases.
Article
Nanoscience & Nanotechnology
Obert Golim, Vesa Vuorinen, Glenn Ross, Tobias Wernicke, Marta Pawlak, Nikhilendu Tiwary, Mervi Paulasto-Krockel
Summary: In this study, a low-temperature wafer-level bonding process using the Cu-Sn-In ternary system and Si wafers with microbumps was carried out at 150 degrees C. Thermodynamic and microstructural analysis showed that this bonding process could achieve high bonding quality with adequate mechanical strength.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Aerospace
Junjie Cai, Shengpeng Hu, Hongbing Liu, Danyang Lin, Wei Fu, Xiaoguo Song
Summary: The dissimilar materials brazing of Ti2AlNb alloy to GH99 superalloy is of great importance in the aerospace field. The interfacial structures and properties of the joints were investigated under different brazing temperatures and times. The interfacial microstructure was influenced by diffusion and reaction between the filler alloy and the parent metal. The maximum shear strength of the joints was found to be approximately 216.2 MPa when brazed at 1000 degrees C for 8 min.
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)