Article
Chemistry, Physical
Yanchong Yu, Yanquan Ji, Shaohua Zhang, Shuai Wang, Yiwan Chen, Baosheng Liu, Yanghuan Zhang
Summary: In this study, Mg-Ni-Y alloy was prepared and it was found that the Ni element can improve the thermodynamic properties of the alloy. Increasing Ni content helps to enhance the hydrogen absorption and desorption kinetics of the alloy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Hongli Kang, Hui Yong, Jinzhi Wang, Shengxuan Xu, Linjian Li, Shuai Wang, Jifan Hu, Yanghuan Zhang
Summary: The multi-element Mg-based alloys prepared by combination technology of induction smelting and mechanical milling were studied for their hydrogen storage behaviors and reversible reaction mechanisms. The addition of Ni and Y elements was found to improve the hydrogen absorption and desorption kinetics. Additionally, Ni and Y elements altered the rate-limiting step of the hydrogen desorption process in the Mg-Ce alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Hongju Qiu, Weiwei Huang, Yanqiong Zhang, Jin Chen, Lei Gao, Mamdouh Omran, Li Nan, Guo Chen
Summary: In this study, a co-precipitation process was proposed to synthesize highly dispersed MgO-Y2O3 co-stabilized ZrO2 nanopowders. The effects of different calcination temperatures on the crystallization degree and particle dispersion of zirconia nanopowders were characterized. The optimum synthesis conditions were obtained as high-energy planetary grinding for 6 hours and calcination at 800 degrees C in an electric furnace, resulting in an average particle size of 28.7 nm.
CERAMICS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Cheng Liu, Qun Luo, Qin-Fen Gu, Qian Li, Kuo-Chih Chou
Summary: This study aims to experimentally determine the phase equilibria relationships of Mg-Ni-Y system, focusing on LPSOs, and establish a thermodynamic description. Four types of LPSOs are confirmed and their formation enthalpies are calculated. A new ternary compound, called tau phase, is observed for the first time, which is significant for the design of advanced magnesium-based alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Jiwei Yao, Hui Yong, Yang Zhao, Chengyan Sun, Xianliu Xu, Baosheng Liu, Dongliang Zhao, Jifan Hu, Yanghuan Zhang
Summary: The Mg90Ce5Y5 + x wt% ZnF2 (x = 3, 6, 10, 15) composites were prepared by mechanical ball-milling, and their effects on the hydrogen absorption and desorption properties of Mg90Ce5Y5 alloy were investigated. The addition of ZnF2 introduced MgF2 and MgZn2 phases, which acted as catalysts and improved the hydriding-dehydriding characteristics. Mg90Ce5Y5 + 6 wt% ZnF2 composites exhibited the fastest hydrogen adsorption/desorption kinetics and lower decomposition temperatures.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Environmental
Xiangyang He, Xu Zhang, Baoquan Li, Shujuan Zhou, Yuyuan Zhao, Li Wang, Jin Xu, Huizhong Yan
Summary: La-Y-Ni-based alloys have potential as hydrogen storage materials, but their rapid capacity degradation limits their applications. This study investigates the capacity degradation mechanism of these alloys and the effect of the La/Y ratio on their cyclic stability. The expansion/contraction properties of the subunits in the hydrogen solid solution and hydrides lead to lattice strain and pulverization. Adjusting the subunit ratio can decrease lattice strain and improve cyclic stability. The cyclic stability in the electrolyte decreases with a lower La/Y ratio, opposite to the trend observed in the solid/H-2 system. Y-poor and Y-rich alloys are suitable for electrochemical and solid-state hydrogen storage applications, respectively.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Wei Zhang, Dongliang Zhao, Jun Li, Zeming Yuan, Shihai Guo, Yan Qi, Yanghuan Zhang
Summary: Ball milling Mg-based alloys with transition metal compounds enhances their hydrogen storage performances. In this experiment, La1.7Y0.3Mg16Ni + x wt.% TiF3 (x = 0-10) alloys were prepared using mechanical milling technology. XRD, SEM, HRTEM, and granulometry were used to analyze the composition and microstructure. The addition of TiF3 improves the crystallinity, reduces particle and crystallite sizes, and enhances hydriding and dehydriding kinetics. Adding 7 wt% TiF3 decreases the dehydrogenation activation energy and improves the hydrogen absorption rate at low temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Wenchao Cao, Xin Ding, Ruirun Chen, Jiaxin Zhang, Yong Zhang, Hongxian Shen, Hengzhi Fu
Summary: In this study, Mg-Ni alloy fibers with a high Mg content and well-distributed Mg2Ni catalytic phase were successfully prepared using the melt extraction method. A unique metallic glass fiber was formed, and uniformly dispersed Mg2Ni nanoparticles were in-situ formed after pre-annealing. The hydrogen absorption and desorption kinetics of the Mg-Ni fibers were investigated, and the dehydrogenation activation energy and enthalpy changes were accurately characterized using models.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
D. Ezemenaka, C. Patino, A. Genau
Summary: This research focuses on the microstructure evolution and pattern formation in multi-component, multi-phase metallic materials during freezing, specifically investigating the solidification behavior of the three-phase Al-Cu-Mg eutectic. Results show that the stability of three-phase coupled growth in this system is influenced by velocity, gradient, and composition, with comparisons made to thermodynamically predicted values. Unlike the related Al-Ag-Cu eutectic system, thermal gradient was found to have no measurable effect on eutectic spacing or pattern in this study.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Meng Zheng, Yi-Kun Fang, Li-Wei Song, Rui Han, Ming-Gang Zhu, Wei Li
Summary: The nanocrystalline magnetic ribbons of (Nd1-xYx)(14.5)FebalB6Co0.2Al1Cu0.15 (x = 0, 0.1, 0.2, 0.3, 0.4) were prepared and their magnetic properties and microstructures were investigated. Y substitution for Nd led to a decrease in crystal lattice constant. The remanence and intrinsic coercivity decreased with increasing Y content, while the average grain size increased. Strong intergrain exchange coupling interactions were observed in all ribbons, especially with a Y substitution of x = 0.4. The magnetization reversal mechanism was confirmed to be pinning type.
Article
Energy & Fuels
Yuto Shimizu, Shunsuke Cho, Takahiro Kawaguchi, Keita Tanahashi, Kaixin Dong, Tomokazu Nakamura, Ade Kurniawan, Melbert Jeem, Takahiro Nomura
Summary: A core-shell-type microencapsulated phase change material (MEPCM) with a ternary eutectic alloy system was successfully developed for the first time in this study. The MEPCM exhibited a high melting point and latent heat, and had a significantly higher heat storage density compared to other reported MEPCMs. Furthermore, it showed great durability, retaining over 90% of its latent heat capacity after 100 cycles of heat storage and release tests.
JOURNAL OF ENERGY STORAGE
(2024)
Article
Nanoscience & Nanotechnology
X. W. Li, Y. Ruan, C. H. Sun, M. H. Yang, B. Wei
Summary: The peri-eutectic transition L+6-Fe ->gamma-Fe(Ni)+Fe2Ti in ternary Fe66.5Ni17.6Ti15.9 alloy was investigated using directional solidification technique. The primary phase and peri-eutectic had a common orientation relationship, while the eutectic had multiple orientation relationships. This study provided evidence for different growth mechanisms and clarified the nucleation and growth of the peri-eutectic phase.
SCRIPTA MATERIALIA
(2023)
Article
Metallurgy & Metallurgical Engineering
Fenghai Guo, Tiebang Zhang, Limin Shi, Lin Song
Summary: In this study, the hydrogen absorption/desorption cycling properties of Mg-based alloys with in-situ formed Mg2Ni and LaHx (x = 2, 3) nanocrystallines were investigated. The results showed that the Mg-Ni-La alloys exhibited improved hydrogen storage cycling properties and maintained storage hydrogen above 5.5 wt% after 200 cycles. Microstructure observation revealed that powders sintering and hydrogen decrepitation occurred during the cycles, and the in-situ formed LaHx (x = 2, 3) and Mg2Ni nanocrystallines stabilized the microstructures and hindered powders sintering.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Multidisciplinary
Yin Zhang, Hui Yong, Xia Li, Zeming Yuan, Zhonggang Han, Dianchene Feng, Hao Sun
Summary: The addition of Ni element and longer ball-milling time have beneficial effects on the high-rate discharging capabilities and hydrogenation dynamics of Nd-Mg-Ni-based alloys, leading to improved reversible kinetics and electrochemical performance.
Article
Chemistry, Physical
Fei Song, Jiwei Yao, Hui Yong, Shuai Wang, Xianliu Xu, Yiwan Chen, Lin Zhang, Jifan Hu
Summary: By preparing Mg90Ce3Ni7 alloy through medium-frequency induction melting and mechanical ball-milling process, the study found that ball-milling improves the hydrogen storage performance of the alloy by changing its microstructure. The alloy milled for 20 hours can absorb over 3.5 wt % of hydrogen within 30 minutes at 100 degrees C, indicating its potential for practical applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Aerospace
Yunfei Wang, Minjie Wang, Biao Chen, Huijie Sun, Katsuyoshi Kondoh, Laszlo J. Kecskes, Jianghua Shen
Summary: Aluminum alloy 5083 (AA5083) processed by large-scale Equal-channel angular pressing (ECAP) is an excellent engineering material with great prospects for industrial applications. An accurate assessment of the underlying constitutive relationships with easily determined material constants is critical for the predictive design and informed processing of such structural materials. A new dynamic constitutive model based on thermal activation theory was established to describe the plastic flow behavior of the ECAP-processed AA5083 alloy and showed excellent agreement with experimental results.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Materials Science, Multidisciplinary
Abdollah Bahador, Ayhan Yurtsever, Astuty Amrin, Shota Kariya, Junko Umeda, Jianghua Shen, Biao Chen, Takeshi Fukuma, Katsuyoshi Kondoh
Summary: This study aimed to develop novel titanium matrix composites (TMCs) with high strength utilizing powder metallurgy and extrusion techniques. The TiC particle dispersion was similar in both composites, but there was a significant difference in the morphology of the matrix phase. The b phase exhibited improved strength at high temperatures and was slightly harder than the a phase due to the solid solution of Fe and W.
MATERIALS & DESIGN
(2022)
Article
Metallurgy & Metallurgical Engineering
Yongji Liu, Zhonghao Heng, Yupeng He, Ziming Dong, Hailong Jiang, Zhigang Zeng, Jianghua Shen
Summary: Equal channel angular extrusion (ECAE) is an effective method for grain refinement. In this study, the microstructure evolution and tensile behavior of a Mg alloy, AZ31, after each ECAE pass were investigated. A previously unreported rule was discovered, showing that the alloy follows a specific texture evolution pattern regardless of the prior microstructure. The tensile behavior of the extruded samples was found to be highly related to the microstructure.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Chemistry, Physical
Jie Wan, Jinglun Yang, Xinyi Zhou, Biao Chen, Jianghua Shen, Katsuyoshi Kondoh, Jinshan Li
Summary: To solve the issue of ductility collapse in high-strength aluminum matrix composites reinforced with graphene nanosheets (GNSs), a large amount of in-situ alumina nanoparticles (-3 vol%) were introduced into the GNSs/Al composite. Microstructural characterization showed that the introduced alumina nanoparticles were alpha-Al2O3 with a diameter of about 30 nm, uniformly distributed on the Al matrix. Tensile tests revealed that the composite exhibited high tensile strength (464 MPa) and appreciable ductility (8.9%), surpassing results reported in literature. Fractographic analysis indicated that the in-situ alumina nanoparticles acted as nucleation sites for dimples, enabling strain-delocalization and enhancing the plastic deformability. Analysis on strengthening mechanisms confirmed the synergistic reinforcing effect of ex-situ GNSs and in-situ alumina nanoparticles. These findings provide guidance for improving the mechanical properties of GNSs/Al composites.
Article
Materials Science, Multidisciplinary
H. Geng, B. Chen, J. Wan, J. Shen, K. Kondoh, J. S. Li
Summary: Many studies have shown that carbon nanotubes (CNTs) can significantly strengthen pure aluminum and this study investigates whether the same strengthening effect can be achieved in a high-strength aluminum alloy. The results showed that while both composites had the same tensile strength, CNTs had a stronger reinforcing effect in pure aluminum than in the aluminum alloy, suggesting the influence of the matrix on the strengthening behavior of CNTs in aluminum matrix composites.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Wendi Shi, Jianghua Shen, Siyu Lu, Biao Chen, Muhammad Atif, Yulong Li
Summary: A novel Ti-doped ultra-high oxygen content material with outstanding ductility was prepared. Micropillar compression test showed remarkable tensile elongation and high work hardening rate attributed to the presence of multiple slipping systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Jie Wan, Huarui Geng, Biao Chen, Jianghua Shen, Katsuyoshi Kondoh, Jinshan Li
Summary: To overcome the decrease in ductility when strengthening metals through compositing, this study proposes intragranular nano-reinforcement in AMCs via reactive SLM. By completely reacting SiC nanoparticles with Al, in-situ intragranular nanophases were formed, resulting in a high strengthening efficiency (up to 110%) without sacrificing ductility. This study suggests a new direction for developing high-performance AMCs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Xiuxia Wang, Xianzhe Shi, Yuzhong Hui, Biao Chen, Bin Gan, Jianghua Shen
Summary: In this study, a cyclic oil quenching process was used to treat the common medium-carbon steel #45 steel, resulting in the formation of fine-grained structure. This structure exhibited a superior tensile strength of over 1690 MPa and moderate ductility. The refined grains and imbedded dislocations were found to be crucial in enhancing the strength. Furthermore, the material showed increased strength and ductility under dynamic tension due to the strain rate effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Xianzhe Shi, Xiuxia Wang, Biao Chen, Junko Umeda, Katsuyoshi Kondoh, Jianghua Shen
Summary: A bimodal grain structure was developed for commercial purity Ti (CP-Ti) through powder metallurgy processing, hot forging, and heat treatment. The bimodal grains significantly improved the yield strength of CP-Ti while maintaining the ultimate tensile strength and elongation to failure. The yield plateau observed in the bimodal CP-Ti was attributed to the accumulation of geometrically necessary dislocations at the interface between coarse and fine grains.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Minjie Wang, Jianghua Shen, Biao Chen, Umeda Junko, Katsuyoshi Kondoh, Yulong Li
Summary: This study investigated the strain rate sensitivity, activation volume, and mobile dislocations in carbon nanotubes/aluminum composites through stress relaxation compression tests. The results showed that the addition of carbon nanotubes increased the strain rate sensitivity and improved the dislocation storage capability.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Jie Wan, Kangan Li, Huarui Geng, Biao Chen, Jianghua Shen, Yazhou Guo, Katsuyoshi Kondoh, Abdollah Bahador, Jinshan Li
Summary: Al4C3 nanorods were introduced into SLMed AlSi10Mg through in-situ chemical reaction to enhance the strain-hardening ability and delay fracture. The in-cell nanorods increased tensile strength by 15% and ductility by 78%. TEM analysis showed that they pinned and accumulated dislocations within cells, reducing stress concentration.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xianzhe Shi, Xiuxia Wang, Biao Chen, Junko Umeda, Abdollah Bahador, Katsuyoshi Kondoh, Jianghua Shen
Summary: Oxygen is an effective strengthening element in titanium and its alloys, but excessive oxygen can lead to embrittlement. By studying the decomposition process of Ti oxides in a-Ti matrix at elevated temperatures, we can precisely control and push the limit of oxygen in Ti and its alloys. The results show that TiO particles decompose and oxygen atoms diffuse into the matrix. By incorporating 0.87 wt% oxygen, an ultra-high tensile strength of close to 1100 MPa can be achieved without sacrificing elongation-to-failure. The strength contribution from oxygen follows the Labusch law. These findings offer a novel approach to design high-performance Ti alloys with nontoxic and cheap elements.
MATERIALS & DESIGN
(2023)
Article
Engineering, Chemical
Lin Cao, Biao Chen, Jie Wan, Jianghua Shen, Shufeng Li, Shuiqing Liu, Jinshan Li
Summary: High energy ball milling (HEBM) is the most common method to disperse carbon nanotubes (CNTs) in aluminum (Al) powder for the development of high-performance Al matrix composites. However, the dispersion mechanism of CNTs in Al powder is still unclear due to difficulties in characterizing CNTs when buried inside Al powder particles. This study conducted transmission electron microscopy observation of CNTs in Al powder via HEBM with different milling times, revealing the breaking up of CNT clusters and subsequent cold-welding of Al flakes, resulting in re-spheroidization of Al powders and homogeneous dispersion of CNTs.
Article
Nanoscience & Nanotechnology
Siyu Lu, Shenglu Lu, Biao Chen, Ma Qian, Qiuming Wei, Katsuyoshi Kondoh, Jianghua Shen
Summary: In this study, in-situ high temperature electron back-scatter diffraction (HT-EBSD) was used to investigate the phase transformation in Grade 1 commercially pure titanium (CP Ti). The results showed that the transformation from alpha-Ti to beta-Ti followed the Burgers orientation relationship (BOR), while the transformation from beta-Ti to alpha-Ti during continuous cooling led to the formation of Type 2 alpha-variants that defied the BOR. This phenomenon, not reported before for CP Ti, was attributed to the fast cooling process and the lattice mismatch between the two phases.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
Jie Wan, Huarui Geng, Biao Chen, Jianghua Shen, Katsuyoshi Kondoh, Jinshan Li
Summary: In this study, the thermal stability of LPBFed AlSi10Mg was evaluated by exposing it to different temperatures for only 3 minutes. The results showed that LPBFed AlSi10Mg had relatively low thermal stability, with even a short exposure at 200 degrees Celsius leading to a dramatic deterioration in tensile strength. The microstructural analysis revealed that the microstructure of as-built AlSi10Mg underwent a similar evolution to that of annealed cold-worked metals, which was attributed to the excessive energy stored in the as-built microstructure due to fast cooling during LPBF.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
