Article
Materials Science, Multidisciplinary
Takahiro Kimura, Tomoatsu Ozaki, Takayuki Nakamoto, Takao Miki, Isao Murakami, Akiei Tanaka, Yoshiki Hashizume
Summary: A new heat-resistant alloy, Al-8mass%Mn-2mass%Cr, was produced using laser-based powder bed fusion. The alloy exhibited increased Vickers hardness and excellent high-temperature strengths after aging heat treatments at >=250 degrees C. The microstructure analysis revealed that the strong texture of coarse columnar crystal grains and the presence of precipitates at cell boundaries contributed to the strengthening effects in the alloy.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Yuan Tian, Robert Palad, Lu Jiang, Thomas Dorin, Kanwal Chadha, Clodualdo Aranas
Summary: The microstructural evolution during the aging heat treatment of a newly developed steel (M789) was evaluated. Analysis suggested that as-printed samples contained a fully martensitic phase, and heat-treated samples showed nano-scale precipitates contributing to increased tensile strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Lanbo Li, Tiechui Yuan, Bo Feng
Summary: Al-Zn-Mg-Cu-Si-Zr powders were produced using directed energy deposition (DED) and laser powder bed fusion (LPBF) methods. The DED sample had larger pore and grain sizes (30μm and 15.36μm) compared to the LPBF sample (3μm and 3.12μm). The microstructure of the DED sample consisted of equiaxed grains, while the LPBF sample exhibited a mixed microstructure with large columnar grains in the melt pool center and small equiaxed grains on the melt pool boundary. The mechanical properties of the LPBF sample, including yield strength, tensile strength, and elongation, were significantly higher than those of the DED sample.
Article
Nanoscience & Nanotechnology
Derui Jiang, Xiang Gao, Yuman Zhu, Christopher Hutchinson, Aijun Huang
Summary: This study investigated the microstructure and mechanical properties of additively manufactured 25Cr SDSS using metal powder based DLD. The results showed that DLD produced 25Cr SDSS had a balanced duplex structure and exhibited superior tensile strength compared to the commercial wrought alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Chee Koon Ng, Kewu Bai, Delvin Wuu, Kwang Boon Lau, Jing Jun Lee, Augustine Kok Heng Cheong, Fengxia Wei, Baisong Cheng, Pei Wang, Dennis Cheng Cheh Tan, Yong-Wei Zhang
Summary: A CoCrFeNiW metal-matrix composite (MMC) fabricated by laser powder bed fusion and post-annealing exhibits comparable tensile ductility and yield strength to as-casted CoCrFeNiW high entropy alloys. The synergistic combination of dislocation, solid solution, and grain boundary strengthening due to the multiple roles of W in the fabrication process contributes to the strength and ductility of the MMC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Materials Science, Multidisciplinary
Dina Bayoumy, Wenhao Kan, Xinhua Wu, Yuman Zhu, Aijun Huang
Summary: Laser powder bed fusion (LPBF) is a typical additive manufacturing technique that allows the fabrication of complex-shaped structures. Recent progress has been made in developing Sc-containing Al alloys specifically for LPBF production, which exhibit excellent processability and superior mechanical properties. This paper reviews the influence of Sc additions on the microstructure and properties of Al alloys when processed via LPBF, aiming to achieve remarkable material consolidation and excellent mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Yoji Miyajima, Yuta Nakamura, Yoichiro Konishi, Kazuhiro Ishikawa, Wenyuan Wang, Naoki Takata
Summary: The AlSi10Mg sample was additively manufactured using laser powder bed fusion (L-PBF) and then subjected to low-temperature annealing (LTA) at 413K or 473K. The hardness tests showed that annealing at 473K resulted in a peak hardness of around 160 HV, while annealing at 413K resulted in a peak hardness of around 145 HV. The flow stress of tensile and compression deformations were also affected by LTA, with the highest 0.2% proof stress achieved under peak aging conditions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Sabine Oeser, Johannes Preussner, Georg Roedler, Norbert Pirch, Andreas Weisheit
Summary: In this study, new Al-Ni eutectic alloys were manufactured by laser metal deposition (LMD), and their microstructure and properties were examined. The microstructure of the alloys showed different appearances along the track height, including coarse structure at the interlayer boundary and twinned dendrites under certain process parameters. The mechanical properties of the alloys were evaluated through tensile testing.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Biliang Yuan, Yong Dong, Chuanqiang Li, Yang Yang, Peng Zhang
Summary: The influence of annealing treatment on the microstructure and mechanical properties of single phase structural Al0.3CoCrFeNiCu high entropy alloy fabricated by selective laser melting was investigated. The results showed that the L1(2) precipitates dispersed in matrix and enriched at sub-grain boundaries after annealing at 600 degrees C for 10 hours, leading to a significant improvement in microhardness and compressive yield strength. Post-annealed HEA still exhibited considerable ductility, with the strength mechanism attributed to nano-sized L1(2) precipitates in sub-grains and their enrichment at the sub-grain boundaries.
Article
Chemistry, Physical
Wenyuan Wang, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato
Summary: The thermally induced variations in microstructural characteristics of Al-15Fe binary alloy samples fabricated by L-PBF at intermediate temperatures were investigated. The microstructure consisted of stable theta-Al13Fe4 phase, spherical metastable Al6Fe-phase particles, and nanoscale alpha-Al/Al6Fe cellular structure. The alpha-Al/Al6Fe cellular structure dissolved, followed by growth and precipitation of particles, and formation of equiaxed grains during thermal exposure. These changes were more pronounced at higher temperature.
Article
Materials Science, Multidisciplinary
Sapam Ningthemba Singh, Ashish B. Deoghare
Summary: Microstructure and micro-hardness of Ti6Al4V samples manufactured by high-layer thickness laser-directed energy deposition (LDED) were analyzed. Surface cracks and small voids were observed on as-printed surfaces due to high-temperature gradient and deposition path. Overall uniform distribution of elements was found except for concentrated C deposition. The study also showed a decrease in yield stress and ultimate tensile strength after the tensile test.
Article
Materials Science, Multidisciplinary
Stanislau Niauzorau, Natalya Kublik, Emmanuel Dasinor, Amm Hasib, Aliaksandr Sharstniou, Bruno Azeredo
Summary: Spherical nanoporous copper powders (PCu) were synthesized via dealloying of Cu-Al gas-atomized precursors with high-throughput, moderate flowability, moderate-oxygen content, high-surface area, and free of precipitates. The nanoscale weldability of hybrid feedstocks composed of PCu and copper nanoparticles were used to overcome the metastability of PCu and preserve its high-surface area. Open-die casting in reducing atmospheres resulted in parts with ultimate compression strength while forming electrically conductive solids with preserved nanoporosity.
APPLIED MATERIALS TODAY
(2023)
Review
Materials Science, Multidisciplinary
Soroush Parvizi, Seyed Mahdi Hashemi, Fatemeh Asgarinia, Mohammadreza Nematollahi, Mohammad Elahinia
Summary: This paper reviews the excellent properties of NiTi alloys in aerospace and biomedical applications, focusing on powder metallurgy techniques. It analyzes the impact of various processing parameters on microstructure and properties, discusses the influence of alloying elements, and summarizes the results of employing different processing parameters. Additionally, it considers novel functional structures and aims to provide a better understanding of the correlation between process parameters and properties of NiTi parts manufactured by PM processes.
PROGRESS IN MATERIALS SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Z. Liu, T. Chen, W. S. Cai, H. Z. Lu, Z. C. Lu, D. Wang, X. Q. Li, X. Y. Zhang, C. Yang
Summary: In this study, a discharge plasma modification method is used to treat recycled titanium powder, resulting in the production of high-performance titanium alloy materials. This provides an inexpensive and sustainable approach for manufacturing high-performance metallic components via laser powder bed fusion.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Mechanical
Thomas Childerhouse, Everth Hernandez-Nava, Nikolaos Tapoglou, Rachid M'Saoubi, Luiz Franca, Wayne Leahy, Martin Jackson
Summary: This study found that removing defects during machining can significantly improve fatigue performance in metal additive manufactured components, while hot isostatic pressing treatment can effectively reduce gas porosity to a lesser degree than machining.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Manufacturing
Xing Qi, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato
ADDITIVE MANUFACTURING
(2020)
Article
Engineering, Manufacturing
Naoki Takata, Mulin Liu, Hirohisa Kodaira, Asuka Suzuki, Makoto Kobashi
ADDITIVE MANUFACTURING
(2020)
Article
Engineering, Industrial
Asuka Suzuki, Kazuki Noritake, Naoki Takata, Makoto Kobashi
Summary: Fe/epoxy resin hybrid structures were fabricated using a three-dimensional open-cellular porous Fe/TiB2 composite layers through an in-situ reaction synthesis process. The relationship between tensile joint strength and structures of the porous layer was investigated, showing that surface roughness and interface adhesiveness play important roles in determining the joint strength.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Xiaoyang Liu, Keito Sekizawa, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Tetsuya Yamada
Review
Biochemistry & Molecular Biology
Asuka Suzuki, Hiroshi Yukawa
Article
Biochemistry & Molecular Biology
Asuka Suzuki, Hiroshi Yukawa
Article
Chemistry, Physical
Wenyuan Wang, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato
Article
Chemistry, Physical
Naoki Takata, Taiki Okano, Motonari Aikawa, Asuka Suzuki, Makoto Kobashi, Koji Hagihara
Article
Biochemistry & Molecular Biology
Asuka Suzuki, Hiroshi Yukawa
Summary: Vanadium (V) alloy membranes have higher hydrogen permeability but poor resistance to hydrogen-induced embrittlement. Adding Cr and Fe can enhance the mobility of hydrogen atoms, while the additions of Al and Pd decrease hydrogen diffusivity. For V-based alloy membranes, Fe and Cr are more suitable alloy elements compared with Al and Pd in terms of hydrogen diffusivity.
Article
Materials Science, Multidisciplinary
Takamasa Inukai, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Yuji Okada, Yuichi Furukawa
Summary: The study found that the combustion foaming to synthesize closed-cellular porous Al3Ti composites consists of six steps, with different changes in the sample at each step, leading to the formation of porous metal in the end.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xiaoyang Liu, Takafumi Wada, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Masaki Kato
Summary: The study investigated the formation mechanism of shear band in metallic lattice structures under compression and approaches to suppress it. Experimental and finite element analysis results showed that controlling the diameter ratios of the struts could suppress shear band formation, leading to more stable compressive deformation and higher energy absorption capacity in lattice structures.
MATERIALS & DESIGN
(2021)
Article
Crystallography
Wenyuan Wang, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato
Summary: By systematically varying laser power and scan speed, crack-free macroscopic samples of hypereutectic Al-15%Fe alloy were manufactured with a small laser process window. However, higher scan speeds and laser powers led to the formation of cracks, especially along melt pool boundaries decorated with brittle phase, resulting in reduced processability of the alloy. The deposited energy density model was found useful for identifying optimum process conditions towards densification, but its applicability was reduced for this alloy due to inhomogeneous microstructures with coarsened brittle phases.
Article
Chemistry, Physical
Ruoqi Li, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Yuji Okada, Yuichi Furukawa
Summary: This study systematically investigated the precipitation of intermetallic phases and associated hardening in the AC2B alloy through artificial aging treatments at temperatures above 400 degrees C. The increase in hardness was attributed to the precipitation of metastable phases, while the subsequent decrease was linked to the precipitation of stable phases and their coarsening. The natural age-hardening behavior varied significantly depending on the prior artificial aging temperatures and solute contents in the Al matrix.
Article
Chemistry, Physical
Wenyuan Wang, Naoki Takata, Asuka Suzuki, Makoto Kobashi, Masaki Kato
Summary: The thermally induced variations in microstructural characteristics of Al-15Fe binary alloy samples fabricated by L-PBF at intermediate temperatures were investigated. The microstructure consisted of stable theta-Al13Fe4 phase, spherical metastable Al6Fe-phase particles, and nanoscale alpha-Al/Al6Fe cellular structure. The alpha-Al/Al6Fe cellular structure dissolved, followed by growth and precipitation of particles, and formation of equiaxed grains during thermal exposure. These changes were more pronounced at higher temperature.
Article
Crystallography
Mulin Liu, Takafumi Wada, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Masaki Kato
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)
