Article
Materials Science, Multidisciplinary
Y. H. Meng, S. Y. Zhang, W. H. Zhou, J. H. Yao, S. N. Liu, S. Lan, Y. Li
Summary: Structural relaxation and subsequent rejuvenation through thermal treatment can improve the plasticity and fracture toughness of metallic glasses. The recovery of loosely packed regions in the atomic structure during annealing contributes to the observed rejuvenation. Tailoring the mechanical properties of metallic glasses can be achieved by controlling the annealing and thermal treatment conditions.
Article
Materials Science, Multidisciplinary
L. T. Zhang, Yun-Jiang Wang, Y. Yang, J. C. Qiao
Summary: In this study, the rejuvenation of metallic glasses through the training of the beta relaxation process is demonstrated. The transition from structural relaxation to rejuvenation is observed with increasing training frequency. Surprisingly, rejuvenation can be achieved at a relatively small cyclic strain of 0.2%. Rejuvenation increases relaxation enthalpy and promotes decoupling of the beta relaxation process and relaxation process. A cluster of beta relaxation time curves is formulated to describe energetic states between ultrastable and ultimately rejuvenated metallic glasses. Additionally, rejuvenation expands the distribution of the beta relaxation process, anelastic, and viscoplastic components during deformation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
X. Yuan, D. Sopu, F. Spieckermann, K. K. Song, S. Ketov, K. G. Prashanth, J. Eckert
Summary: Rejuvenation is the reverse process of relaxation in metallic glasses, which increases their free volume and brings them to a higher energy state. This study explores the controllable rejuvenation degree through a dilution procedure and identifies the maximum rejuvenation threshold. The activation of structural relaxation and the dynamic balance between free volume creation and annihilation determine the rejuvenation ability of metallic glasses. The highest degree of rejuvenation is related to the flow strain of the materials and exhibits a structure similar to shear bands.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Stefan Michalik, Zuzana Molcanova, Michaela Sulikova, Katarina Kusnirova, Pal Jovari, Jacques Darpentigny, Karel Saksl
Summary: The Mg-Zn-Ca system was investigated for its glass-forming ability by fabricating ribbon specimens using melt-spinning technique with a concentration line of 7 at.% calcium. The samples were characterized to determine their mass density, hardness, elastic modulus, and crystallisation temperatures. Pair distribution functions obtained by HEXRD and ND measurements described the amorphous structure, revealing contributions of Mg-Mg, Mg-Zn, and Zn-Zn pairs. In situ HEXRD showed the transformation process from amorphous to crystalline structure for Mg60Zn33Ca7 and Mg50Zn43Ca7, proposing the formation of intermetallic compounds IM1 and IM3 as well as hcp-Mg phase in multiple crystallisation events.
Article
Materials Science, Multidisciplinary
Keita Nomoto, Anna Ceguerra, Christoph Gammer, Bosong Li, Huma Bilal, Anton Hohenwarter, Bernd Gludovatz, Jurgen Eckert, Simon P. Ringer, Jamie J. Kruzic
Summary: The study revealed the hierarchical structure of BMGs through nanobeam electron diffraction experiments, showing that the local hardness of microscale domains decreases with the size and volume fraction of atomic clusters with higher local MRO. A model of ductile phase softening was proposed to enable the design of BMGs in the future by tuning the MRO size and distribution in the nanostructure.
Article
Chemistry, Physical
Sergio Scudino, Junhee Han, Rub Nawaz Shahid, Dina Bieberstein, Thomas Gemming, Jon Wright
Summary: Shear bands are nanoscale planar shear defects that mediate plasticity in metallic glasses. The understanding of shear banding requires three-dimensional characterization, which was not possible until now due to the inability of X-ray absorption tomography to distinguish shear bands from the surrounding matrix. However, this study overcomes this limitation by using the strain field generated by shear bands as a local probe for X-ray diffraction tomography.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Z. Chen, Y. Xie, A. Datye, J. Thornton, J. Schroers, J. J. Cha, U. D. Schwarz
Summary: Replication of single-crystalline strontium titanate (STO) surfaces through thermoplastic forming with an alloy results in a perfect angstrom-scale replication, while a partially amorphous surface layer is retained even after heating above typical bulk crystallization temperatures. This layer not only helps improve the mechanical and chemical properties of parts, but also provides stability at high temperatures.
MATERIALS TODAY NANO
(2021)
Article
Materials Science, Multidisciplinary
Baoshuang Shang, Weihua Wang, Alan Lindsay Greer, Pengfei Guan
Summary: Thermal cycling in metallic glasses can induce rejuvenation and relaxation, gradually erasing the initial glass structure through local atomic rearrangements. Molecular dynamics simulations reproduce physically observed effects, suggesting potential for optimizing properties of metallic glasses through thermal cycling.
Article
Multidisciplinary Sciences
Yao Tang, Haofei Zhou, Haiming Lu, Xiaodong Wang, Qingping Cao, Dongxian Zhang, Wei Yang, Jian-Zhong Jiang
Summary: By adjusting processing conditions, controllable structural gradients can be designed in bulk metallic glasses, resulting in enhanced plasticity and suppression of shear localization.
NATURE COMMUNICATIONS
(2022)
Article
Metallurgy & Metallurgical Engineering
Pan Jie, Duan Fenghui
Summary: Metallic glasses are a subject of interest in condensed physics and materials science due to their unique structure and properties. Rejuvenation is a process that transforms the material back to a higher-energy state, significantly expanding the energy range and improving deformation capability.
ACTA METALLURGICA SINICA
(2021)
Article
Chemistry, Physical
D. V. Louzguine-Luzgin, Yu. P. Ivanov, A. L. Greer
Summary: The crystallization behavior of a Cu58Y37Sc5 metallic glassy alloy was investigated using various methods. Differential scanning and isothermal calorimetries were performed to study the phase transformations. X-ray diffractometry studies showed the simultaneous formation of Cu2Y, CuY, and CuSc crystalline phases, indicating eutectic crystallization, while the isothermal crystallization kinetics corresponded to primary crystallization. Transmission electron microscopy observations revealed a complex crystallization process involving heterogeneous nucleation on pre-existing particles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Y. Tang, H. F. Zhou, X. D. Wang, Q. P. Cao, D. X. Zhang, J. Z. Jiang
Summary: The study investigated the effects of thermal cycling on structure and properties in metallic glasses, highlighting contrasting behaviors exhibited by Fe80P20 and Ni60Nb40 metallic glasses during thermal cycling treatment, which are not completely understood at the molecular level.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Ceramics
Nicolas Amigo
Summary: Rejuvenation in metallic glasses (MGs) can be achieved by thermal cycling treatments, which result in enhanced ductility. Atomic scale studies showed that treated samples had higher potential energy and less-dense structures, fewer high-centrosymmetric Voronoi polyhedra, and increased liquid-like structures. Thermal cycling also reduced the fraction of 3-atom connections and increased 2-atom and 4-atom connections, explaining the enhanced plasticity of MGs.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
S. Li, W. H. Lin, Y. Teng, Z. D. Sha
Summary: In this study, we developed a criterion based on the chemical composition to determine whether metallic glasses (MGs) can be rejuvenated. By studying six different MG systems, we found that the rejuvenated MGs have a slow diffusion process at high temperatures. Additionally, the rejuvenated MGs showed large negative mixing enthalpy and large mismatch entropy, indicating a close correlation with the glass-forming ability. These findings advance our understanding of the rejuvenation mechanism in MGs, and establish a correlation between the chemical composition and rejuvenation.
Article
Nanoscience & Nanotechnology
Lingling Wang, Zheng Wang, Wei Chu, Xi Zhao, Lina Hu
Summary: Rejuvenation of metallic glasses under cryogenic thermal cycling has attracted attention due to its potential for fundamental and practical interest. This study discovered the quasi-periodic characteristics of two typical evolution paths (rejuvenation and relaxation) in metallic glasses through extensive thermal cycling. It was found that rejuvenation mainly comes from local atomic motion in loosely packed regions, while relaxation occurs through cooperative motion of atoms in densely packed regions. The results provide a comprehensive understanding of the mechanism of rejuvenation and a new strategy for modulating the properties of metallic glasses by controlling microstructures through thermal cycling.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Rodolfo Lisboa Batalha, Vitor Eduardo Pinotti, Omar O. S. Alnoaimy, Weverson Capute Batalha, Tobias Gustmann, Konrad Kosiba, Simon Pauly, Claudemiro Bolfarini, Claudio Shyinti Kiminami, Piter Gargarella
Summary: The TNZT alloy reinforced with TiB2 shows refined microstructure, increased compressive strength (495 MPa), and maintained ductility, making it a promising choice for manufacturing complex components for biomedical applications. Compared to the unreinforced TNZT, the addition of a small fraction of TiB2 results in higher compressive strength and does not sacrifice ductility.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Hongyu Chen, Tiwen Lu, Yonggang Wang, Yang Liu, Tongya Shi, Konda Gokuldoss Prashanth, Konrad Kosiba
Summary: CoCrFeMnNi high-entropy alloy matrix composites reinforced with nano-sized TiC particles were successfully fabricated by laser powder bed fusion (LPBF). The LPBF-fabricated HEA composites showed hierarchical microstructure characteristics and a high dislocation density, which were greatly influenced by the addition of nano-TiC particles.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Tianlong Zhang, Jiaming Zhu, Tao Yang, Junhua Luan, Haojie Kong, Weihong Liu, Boxuan Cao, Shiwei Wu, Dong Wang, Yunzhi Wang, Chain-Tsuan Liu
Summary: A new Ti-6Al-2V-1Cr-1Fe alloy with fine grain sizes, fine precipitates, high strength, and excellent ductility has been developed, showing significant improvements in properties compared to the commercial Ti-6Al-4V alloy. The alloying elements and tuning of supercooling capacity play key roles in achieving grain refinement and improved mechanical properties. This low-cost Ti alloy is expected to be highly suitable for various structural applications.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Manufacturing
Tiwen Lu, Ning Yao, Hongyu Chen, Binhan Sun, XiYu Chen, Sergio Scudino, Konrad Kosiba, Xiancheng Zhang
Summary: The cryogenic mechanical properties and deformation behavior of additively manufactured medium/high-entropy alloys and their composites are investigated in this study. The results demonstrate that the combination of strength and ductility can be improved at both room and cryogenic temperatures by controlling particle distribution and strengthening mechanisms. This research provides a new approach for designing materials with a good combination of strength and ductility for cryogenic applications.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Yang Liu, Jinhui Meng, Lei Zhu, Hongyu Chen, Zhiguo Li, Shuxin Li, Di Wang, Yonggang Wang, Konrad Kosiba
Summary: In this study, the strain rate and temperature dependence of the dynamic compressive properties of SLM-TC4 alloy were investigated through high speed impacting tests. The results showed that the yield strength and ultimate compressive strength of the alloy increased with increasing strain rate and decreasing temperature, indicating significant strain rate and temperature sensitivities. The texture of the alloy was significantly intensified by the high speed impacting load. Adiabatic shear bands were more likely to evolve at higher temperatures and strain rates, leading to the formation of submicron equiaxed grains. The findings in this study provide a theoretical basis for understanding the deformation behavior and mechanism of SLM-TC4 alloy under impacting loads, contributing to the wider application of SLM technique and products.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Tianbing He, Tiwen Lu, Daniel Sopu, Xiaoliang Han, Haizhou Lu, Kornelius Nielsch, Jurgen Eckert, Nevaf Ciftci, Volker Uhlenwinkel, Konrad Kosiba, Sergio Scudino
Summary: This study explores the effectiveness of powder metallurgy as an alternative method for synthesizing shape memory bulk metallic glass composites. Shape memory bulk metallic glass composites with tunable microstructures and properties are obtained by hot pressing. The results demonstrate the expanded range of shape memory bulk metallic glass composites by freely choosing the combination of glassy matrix and shape memory phase.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Physical
Uta Kuehn, Jan Sander, Katharina Nicole Gabrysiak, Lars Giebeler, Konrad Kosiba, Stefan Pilz, Kai Neufeld, Anne Veronika Boehm, Julia Kristin Hufenbach
Summary: This study compares materials processed by different manufacturing techniques and finds that centrifugal cast material and LPBF samples have similar microstructures and mechanical properties, providing a convenient way to evaluate the mechanical properties of LPBF-manufactured materials. Centrifugal casting has significant application value in material screening and the development of novel alloys adapted to LPBF processing.
Article
Engineering, Manufacturing
H. S. Maurya, K. Kosiba, K. Juhani, F. Sergejev, K. G. Prashanth
Summary: Ceramic matrix composites like cermets are difficult to be fabricated using additive manufacturing (AM) processes. The laser powder-bed fusion (LPBF) process, also known as selective laser melting (SLM), has been used to fabricate green cermets like TiC-430 L AISI ferritic stainless steel (430 L-FSS). In this study, multiple laser scanning was employed to preheat and melt the powder bed with different parameters, resulting in crack-free cermets. The microstructure evolution, densification process, and mechanical properties of the fabricated cermets were studied using scanning electron microscopy, X-ray diffraction, and compression tests. The results showed that lowering the scan speed improved the microstructure but increased the presence of cracks, and increasing the energy density resulted in a coarser microstructure with porosity and reduced fracture toughness.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Hongyu Chen, Konrad Kosiba, Tiwen Lu, Ning Yao, Yang Liu, Yonggang Wang, Konda Gokuldoss Prashanth, Challapalli Suryanarayana
Summary: This study utilized laser powder bed fusion (LPBF) to fabricate high-performance HEA components and investigated the impact of adding nano-scale TiC particles on the mechanical properties of CoCrFeMnNi HEA. The results showed that the introduction of an optimized content of nano-TiC led to improved strength and ductility in the HEA composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hongyu Chen, Yang Liu, Yonggang Wang, Zhiguo Li, Di Wang, Konrad Kosiba
Summary: CoCrFeMnNi high entropy alloy (HEA) parts were fabricated using laser powder bed fusion (LPBF), and their dynamic compressive properties and microstructures at different temperatures were analyzed. The HEAs exhibited excellent strength-ductility combination, especially at cryogenic temperature and high strain rate. The deformation mechanism of the HEAs was dominated by deformation twinning and dislocation pile-up around twins. The fraction of twin boundaries and dislocation density correlated with the test temperature.
MATERIALS & DESIGN
(2022)
Article
Engineering, Manufacturing
Zhennan Wang, Xin Lin, Lilin Wang, Haiou Yang, Yinghui Zhou, Julia Kristin Hufenbach, Konrad Kosiba, Tianchi Zhang, Weidong Huang
Summary: In this study, a microalloying method was used to fabricate Al-Cu alloy with high strength and ductility using the Arc-DED process. The resulting material exhibited fully equiaxed grains and a high density of strengthening phase, leading to superior mechanical performance.
ADDITIVE MANUFACTURING
(2022)
Article
Chemistry, Physical
Konrad Kosiba, Denys Y. Kononenko, Dmitry Chernyavsky, Liang Deng, Jozef Bednarcik, Junhee Han, Jeroen van den Brink, Hwi Jun Kim, Sergio Scudino
Summary: Due to layer-by-layer processing, laser powder bed fusion (LPBF) can overcome the size limitation of bulk metallic glasses (BMGs) caused by high cooling rates. However, fabricating amorphous and highly dense parts via LPBF is challenging because the processing parameters affect both requirements in a contrasting manner. In this study, specimens of the glass-forming Zr52.5Cu17.9Ni14.6Al10Ti5 alloy were fabricated using LPBF under varying processing conditions. Processing maps of amorphicity and density were provided and evaluated in terms of porosity, structural relaxation, and crystallization. Optimal processing conditions for maximizing density and amorphicity were identified. The dataset helps quantify the correlation between relative density, amorphicity, volumetric energy density, and normalized enthalpy criteria. Pearson and Spearman correlation analyses revealed an equally strong dependence between these criteria and relative density, and an inverse moderate dependence with amorphicity. A modified enthalpy criterion, which correlates strongest with density among the non-dimensional parameters, was derived based on the results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Konrad Kosiba, Daniel Wolf, Matthias Bonisch, Kai Neufeld, Ruben Huehne, Tobias Gustmann, Jozef Bednarcik, Hongyu Chen, Xiaoliang Han, Volker Hoffmann, Lukas Beyer, Uta Kuehn, Sergio Scudino, Lars Giebeler, Julia K. Hufenbach
Summary: This study demonstrates the successful fabrication of dense parts (99.8%) by LPBF using Fe85Cr4Mo1V1W8C1 high-carbon steel. The LPBF-fabricated steel shows good mechanical and wear performance, indicating its potential application in tooling.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Konrad Kosiba, Tobias Gustmann, Jong Tae Kim, Jinwoo Seok, Juree Jung, Lukas Beyer, Sergio Scudino, Lars Giebeler, Junhee Han, Julia K. Hufenbach
Summary: High-power laser power bed fusion (HP-LPBF) technology enables additive manufacturing at higher build-up rates, making it attractive for industrial applications. The cooling rate during HP-LPBF was experimentally determined and found to vary with layer thickness and laser power. Higher build-up rates can be achieved with relatively low cooling rates, but this can affect the microstructure and properties of the manufactured components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Rodolfo Lisboa Batalha, Vitor Eduardo Pinotti, Omar O. S. Alnoaimy, Weverson Capute Batalha, Tobias Gustmann, Konrad Kosiba, Simon Pauly, Claudemiro Bolfarini, Claudio Shyinti Kiminami, Piter Gargarella
Summary: The Ti-35Nb-7Zr-5Ta alloy reinforced with TiB2 synthesized by L-PBF shows improved compressive strength without sacrificing ductility or altering Young's modulus by reducing grain size and improving the microstructure.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Shuai Zhang, Shuye Zhang, Hongzhi Zhou, Kyung-Wook Paik, Tianran Ding, Weimin Long, Sujuan Zhong, Peng He
Summary: Microwave Hybrid Heating (MHH) is a promising method for material joining, allowing for selective and uniform heating. This experimental study focused on investigating the characteristics and reliability of joints made using nano-Sn-3.0Ag-0.5Cu soldering paste and MHH technique. The research findings showed that the shear strength of the joints reached its peak value under specific microwave power and exposure time, but decreased after thermal shock tests.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Peibin Ma, Mingyang Wang, Aiying Chen, Lijian Gu, Zhiyi Ding, Xiaogui Wang, Bin Gan
Summary: Nano-twinned boundaries in high-temperature alloys play a crucial role in regulating the distribution of nano-precipitates and enhancing mechanical properties.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Jiachen Zhang, Fan Lu, Xinxin Liu, Taiwen Huang, Rui Li, Changsheng Tan, Guojun Zhang, Lin Liu
Summary: This study investigates the effects of Re and Ta interactions on the precipitation of the TCP phase in experimental alloys under long-term thermal exposure. The study finds that microstructure segregation is not fully eliminated even with standard heat treatment, and the interaction between Re and Ta enhances the formation of the TCP phase. Thermodynamic calculations and first-principles analysis reveal that Re significantly improves the driving force of TCP phase precipitation. The study also observes a phase transition from the sigma-phase to the P-phase, with Ni playing a crucial role in the diffusion process.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Ronit Roy, Adil Shaik, Matthew Topping, Fei Long, Mark R. Daymond
Summary: This study demonstrates the improvements in characterizing localized dislocation distribution using the HR-EBSD method compared to the conventional approach. Two extreme examples of deformation conditions were investigated to show the efficacy of HR-EBSD in identifying dislocations and subtle features. The direct correlation between slip bands and HR-EBSD estimated GNDs is also presented, enhancing the scope of this approach in identifying individual slip bands.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Wenshan Guo, Hui Zhang, Qingjun Zhou, Guangchun Xiao, Ning Guo, Wei Zhao, Gang Wang
Summary: The microstructures and corrosion resistance of TC11 components were significantly improved using a high-power, high-speed laser metal deposition (LMD) process and subsequent post-heat treatment, with greater improvements observed in the deposition direction. The significant improvement of corrosion resistance in the deposition direction is mainly due to the weakening of the charged galvanic corrosion effect between the non-interlayer zone and interlayer zone.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Shuai Xu, Rui Cao, Junheng Gao, Yu Zhang, Haitao Zhao, Shuize Wang, Yuhe Huang, Guilin Wu, Honghui Wu, Chaolei Zhang, Xinping Mao
Summary: In this study, the microstructures and mechanical properties of interphase precipitation strengthening micro-alloyed steels were investigated. The addition of Cr was found to increase the yield strength without significant decrease of ductility. Thermodynamics analysis revealed that the addition of Cr led to grain refinement and decrease of sheet spacing of nanoprecipitates. Calculations showed that the decrease of interphase-precipitated carbides sheet spacing and the refinement of grain size were responsible for the strength enhancement of Cr microalloyed steel.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Zhaoxin Zhong, Biao Zhang, Yuhan Ren, Jian Ye, Jiawei Zhang, Feng Ye
Summary: In this study, bioinspired web-liked multiphase composites were successfully constructed using boron-modified polysilazane polymer. The composites consisted of long TiB nanowires as 'web' and hybrid TiC and Ti3Si particles as 'nodes'. The enhanced strength of these composites was attributed to the synergistic load transfer of the hybrid reinforcements. This study provides a promising design approach for developing high-performance composites with high reinforcement content, utilizing polymer instead of traditional ceramic powder.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Geng Liu, Linran Yu, Jie Su, Ran Ding, Min Xiong, Qi Gao
Summary: In this study, a flash austenitization heat treatment approach was used to achieve a dual-phase microstructure consisting of retained austenite and fine-grained ferrite in low-carbon TRIP steel. Phase-field simulations revealed the acceleration of ferrite transition kinetics in the Mn-depleted region and the influence of chemical heterogeneity of C and Mn on the stabilization of austenite.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Zhichao Yang, Dehui Zheng, Zhen Wang, Tingbin Liang, Shuangbao Wang
Summary: In this study, the configurations, formation process, and properties of the Cu-rich layer formed during TJE of Al alloys were revealed using aberration-corrected scanning TEM (STEM), STEM image simulations, and first-principles calculations. The results showed a new orientation relationship between the Cu-rich layer and Al matrix, and provided insights into the formation mechanisms of the Cu-rich layer and Cu diffusion zone.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Shuai Chen, Ruyu Tian, Jiayue Wen, Yanhong Tian
Summary: In this study, the interfacial microstructure evolution and reliability of Cu/Sn-3.0Ag-0.5Cu (SAC305)/Ni and Cu/Sn-3.0Ag-0.5Cu-0.05TiO2 (SAC305-0.05TiO2)/Ni interconnections under thermal shock were investigated. The results showed that the addition of TiO2 nanoparticles can suppress the growth of interfacial IMCs and improve the reliability of the connections.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Yunbin Lu, Yangju Feng, Wei Wang, Wenke Wang, Jianlei Yang, Wenzhen Chen, Guorong Cui, Dongdong Zhuang, Hongyang Cao
Summary: In order to improve the wear resistance of titanium alloy, titanium matrix composites with network distributed TiBw were fabricated. The results showed that the wear rate of the composites decreased by 17.2% at room temperature and 38.4% at high temperature compared to the TA15 alloy. The TiBw in the composites enhanced work hardening, improved thermal conductivity, and effectively hindered dislocation movement and promoted dynamic recrystallization during high-temperature wear.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Jubert Pasco, Lu Jiang, Thomas Dorin, Ali Keshavarzkermani, Youliang He, Clodualdo Aranas Jr
Summary: The unique structure and solute distribution of CoCrMo alloys produced using Laser Powder Bed Fusion technique require custom heat-treating processes to achieve the targeted phase distribution and mechanical properties. This study investigates the phase transformation behavior and precipitate distribution of CoCrMo samples after aging heat treatment. The results show differences in phase fraction and nucleation sites between directly aged and solution heat-treated samples.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Zipeng Ma, Meng Zhou, Baohong Tian, Yi Zhang, Heng Li, Xu Li, Jin Zou, Haoyan Hu, Ke Jing, Yong Liu, Alex A. Volinsky
Summary: In this study, two electrical contact composites were prepared using the vacuum hot pressing sintering endo-oxidation method. The addition of Y2O3 had no negative effects on the electrical conductivity and hardness of the composites. Moreover, it reduced the welding force and arc energy, and improved the stability of the contacts.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Wei Sun, Ning Cui, Shuling Zhang, Tiewei Xu, Xiaopeng Wang, Fantao Kong
Summary: A laminated composite was successfully fabricated and its microstructure and mechanical properties were investigated. The composite exhibited high bonding strength, improved flexural strength and fracture toughness, and superior tensile properties compared to the monolithic alloy.
MATERIALS CHARACTERIZATION
(2024)
Article
Materials Science, Multidisciplinary
Zih-You Wu, Yin-Ku Lee, Su-Yueh Tsai, Po-Yu Chen, Jenq-Gong Duh
Summary: With the development of the artificial intelligence (AI) industries, electronic packaging is advancing towards high density, high efficiency, and multi-functionality. The application of microbumps is necessary to achieve high density and small-scale interconnection. In this study, three types of full intermetallic compounds (IMCs) bumps were fabricated, and the mechanical and thermal properties of IMCs were analyzed. The results showed that the full IMCs bumps with added Ni and Zn exhibited consistent structure and excellent thermal stability, providing a reliable microstructure for application.
MATERIALS CHARACTERIZATION
(2024)
