Article
Chemistry, Physical
Dezhu Tan, Cong Peng, Qingan Zhang
Summary: In this study, a Mg-Ni-TiS2 composite was synthesized through a solution-based method, which showed improved hydrogen desorption kinetics due to the synergistic catalytic effect of Mg2NiH4, TiH2, and TiS2. The composite also exhibited high cycle stability. This work provides a feasible approach for the development of Mg-based hydrogen storage materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Chengxiang Zhu, Ming Chen, Miaomiao Hu, Donghui He, Yijin Liu, Tong Liu
Summary: The Mg-Nb@C nanocomposite was synthesized using reactive gas evaporation method, showing excellent hydrogen adsorption and desorption performance. Small Mg particles with Nb catalyst effectively improved the hydrogen sorption kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Yongxi Zhang, Yuan Li, Guanjiu Wu, Chenfeng Fan, Lu Zhang, Shumin Han
Summary: Rare earth-Mg-Ni based alloys with increased Mg content show phase transformation and improved stability and hydrogen absorption properties.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Xin Ding, Ruirun Chen, Xiaoyu Chen, Hongze Fang, Qi Wang, Yanqing Su, Jingjie Guo
Summary: Ultrasonic treatment is used to enhance the de-/hydriding properties of Mg-2Ni alloy, resulting in significant refinement and homogenization of the as-cast alloy microstructure. The hydrogen uptake capacities and de-/hydriding rates improve effectively, especially at lower temperature. The refined primary Mg allows for a larger amount of hydrogen absorption, leading to enhanced hydrogenation rates and capacities.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
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
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
Immaculata J. Ikot, Praise O. Olagoke, Hitler Louis, Destiny E. Charlie, Thomas O. Magu, Aniekan E. Owen
Summary: In this study, the adsorption of molecular hydrogen on phosphorus-doped graphene decorated with five different metals (Aluminum, Calcium, Magnesium, Nickel, and Zinc) was investigated using density functional theory. The results showed that Aluminum and Nickel surfaces exhibited excellent structural and electronic properties with lower chemical hardness and ionization values, indicating better conductivity and hydrogen adsorption potential.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Yi Yin, Yuanhong Qi, Bo Li, Hu Gu, Jinghui Zhao, Liqiang Ji, Bo Zhang, Zeming Yuan, Yanghuan Zhang
Summary: In this study, Mg-Zn-Ni and Mg-Cu-Ni alloys with different NbF5 contents were synthesized, and the effects of NbF5 on microstructure and hydriding/dehydriding kinetics were discussed. The results show that NbF5 can promote microstructural evolution, reduce dehydrogenation activation energies, and significantly improve hydriding/dehydriding kinetics.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Yichao Xie, Guanjiu Wu, Yuan Li, Yongxi Zhang, Qing Wang, Lu Zhang, Shumin Han
Summary: This study used a low-cost YFe0.85 master alloy to improve the cycling stability of La-Mg-Ni-based hydrogen storage alloys. The prepared alloys showed good cycling stability, higher capacity, and satisfactory kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Xin Ding, Ruirun Chen, Jiaxin Zhang, Xiaoyu Chen, Yanqing Su, Jingjie Guo
Summary: In this study, the Mg-Mg2Ni-LaHx nanocomposite was formed through the H-induced decomposition of an alloy, resulting in improved hydrogen capacity and absorption rate. The LaHx nanophase in the nanostructure acted as a catalyst and enhanced hydrogen adsorption, providing important reference for related research.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
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
Metallurgy & Metallurgical Engineering
Hai-chang Zhong, Chen-long Lin, Zi-yu Du, Chun-yan Cao, Chu Liang, Qing-rong Zheng, Le-yang Dai
Summary: LaF3 was doped to the Mg(Al) solid solution alloy to enhance hydrogen absorption and desorption. The results showed that the hydrogen storage kinetic properties were significantly improved in the Mg0.93Al0.07-5wt.%LaF3 nanocomposite, attributed to the reduction of activation energies.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Chemistry, Physical
Jinlian Ni, Yunfeng Zhu, Jiguang Zhang, Zhongliang Ma, Yana Liu, Aoqi Wang, Liquan Li
Summary: It was unexpectedly found that the desorption behavior of magnesium rich Mg-Ni hydrides improved after exposure to air for a certain period. After 4 months of exposure, the dehydrogenation peak and onset temperature were lowered by 150°C and 130°C, respectively. Furthermore, the air-exposed sample exhibited rapid hydrogen absorption and desorption rates at 300°C. The improvement in reactivity is attributed to the refining of the powders, the in-situ formed magnesium hydroxide layer, and the presence of Ni as active catalytic sites.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Hai-Ru Li, Ceng Zhang, Wan-Biao Ren, Ying-Jin Wang, Tao Han
Summary: Based on density functional theory, this paper investigates the electronic properties and hydrogen storage properties of M2B7 (M = Be, Mg, Ca) clusters systematically. It is found that the global minimal structures of Be2B7, Mg2B7, and Ca2B7 are heptagonal biconical structures, with the alkaline earth metals located at the top. The M2B7 clusters exhibit good hydrogen storage capabilities, exceeding the hydrogen storage target set by the US Department of Energy in 2017. The clusters can achieve reversible adsorption of H2 molecules at normal temperature and pressure, making them a promising new nano hydrogen storage material.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Shaoyang Shen, Liuzhang Ouyang, Jiangwen Liu, Hui Wang, Xu-Sheng Yang, Min Zhu
Summary: A one-step high-energy ball milling process is used to in situ form ultrafine Ni nanoparticles and combine them with expanded graphite to synthesize a MgH2Ni-EG nanocomposite. The nanocomposite exhibits excellent hydrogen storage performance at both high and room temperatures.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Bo Hu, Dejiang Li, Zixin Li, Jiangkun Xu, Xueyang Wang, Xiaoqin Zeng
Summary: The hot tearing behavior of the double ternary eutectic alloy system, Al-6Mg-xSi (0 to 6.0 wt pct Si) alloys, was evaluated by a constrained rod casting mold, showing that the types and fractions of solidification phases significantly impact hot tearing susceptibility. The addition of Si content changed the freezing range and eutectic liquid fraction, affecting the nucleation, propagation, and healing of hot tear cracks. Additionally, the drop-in force value on the contraction force curve could predict the hot tearing susceptibility regarding the shrinkage coefficient.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
Zixin Li, Dejiang Li, Wenke Zhou, Bo Hu, Xingfeng Zhao, Jingya Wang, Ming Qin, Jiangkun Xu, Xiaoqin Zeng
Summary: The study found that the volumetric porosity near the gate location of alloy EA42 was significantly higher than that far from the gate due to the short valid time under intensified casting pressure conditions. Introduction of the Z-Propagation method for predicting the projected area fraction of porosity during tensile failure showed better effectiveness compared to traditional methods.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Huan Zhang, Yangxin Li, Yuxuan Liu, Qingchun Zhu, Xixi Qi, Gaoming Zhu, Jinhui Wang, Peipeng Jin, Xiaoqin Zeng
Summary: This study investigates the features and evolution mechanism of {11 (2) over bar1} twin boundaries in a high strain rate compressed Mg-10Gd-3Y-0.4Zr alloy using Schmid factor calculations, EBSD, and TEM analysis. The interaction between basal < a > dislocations and twins during deformation can lead to misorientation deviation and the formation of steps at the twin boundary, providing a new understanding of twinning behavior in Mg alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jie Wang, Gaoming Zhu, Leyun Wang, Evgenii Vasilev, Jun-Sang Park, Gang Sha, Xiaoqin Zeng, Marko Knezevic
Summary: Through systematic design of a low-alloyed Mg-Zn-Ca alloy, improved ductility and strength have been achieved, making it a promising candidate for industrial productions. The co-segregation of Zn and Ca atoms at grain boundaries contributes to the improved ductility of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Mechanical
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: This study aimed to identify the cyclic deformation behavior of a high-pressure die-cast Silafont (R)-36 automotive cast aluminum alloy with heterogeneous composite-like microstructures. The alloy showed superior fatigue resistance at higher strain amplitudes, and the predicted fatigue life using a strain-energy density based accumulative damage model was in good agreement with experimental results. Fatigue crack initiation was observed at surface or near-surface defects, with crack propagation characterized by fatigue striations and tear ridges.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Bijin Zhou, Leyun Wang, Jinhui Wang, Alireza Maldar, Gaoming Zhu, Hailong Jia, Peipeng Jin, Xiaoqin Zeng, Yanjun Li
Summary: The dislocation behavior of Mg-5Y alloy during tensile deformation was quantitatively studied using in-situ tensile test, VPSC modeling, and TEM. Results showed that <a> dislocations were the primary contributors to deformation, with a small fraction of <c+a> dislocations activated near grain boundaries. The alloy exhibited a lower CRSS ratio and high ductility, attributed to the mobility of <c+a> dislocations.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Bo Hu, Zixin Li, Dejiang Li, Tao Ying, Xiaoqin Zeng, Wenjiang Ding
Summary: A criterion based on solidification microstructure was proposed to predict the hot tearing behavior of cast alloys, considering various factors. The credibility of this criterion was validated through the study of hot tearing behavior of Mg-Ce alloys, and a simplified criterion and hot tearing index for specific cases were derived and validated.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Duofei Zheng, Qingchun Zhu, Xiaoqin Zeng, Yangxin Li
Summary: The volume fraction and distribution of long-period stacking ordered (LPSO) phase have a significant impact on the strengthening of Mg alloys. The LPSO phase formed at grain boundary has a higher strengthening effect than that formed within the alpha-Mg matrix, but it compromises the solid-solution strengthening effect due to the consumption of alloying elements.
Article
Materials Science, Multidisciplinary
Wenke Zhou, Zixin Li, Dejiang Li, Ming Qin, Xiaoqin Zeng
Summary: The effect of cooling rate on microstructure evolution of Mg-4La-2.5Al-0.3Mn (LA42) Mg alloy was investigated. High-pressure die casting (HPDC) LA42 alloy exhibited small grain size and undeveloped dendritic structure compared to permanent gravity casting (PGC) LA42 alloy. The eutectic morphology and growth characteristics differed between the two casting methods. The cooling rate influenced the eutectic lamellar spacing in the HPDC LA42 alloy through changes in nucleation and growth velocity.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Yiwen Chen, Quan Li, Yangxin Li, Weisen Zheng, Jingya Wang, Xiaoqin Zeng
Summary: The phase equilibria of Mg-Y-Al alloys with focus on the long-period stacking ordered (LPSO) phases were experimentally investigated. Two thermodynamically stable LPSO polytypes, 18R and 10H structures, were identified. The transformation between these two structures was observed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: The aim of this study was to determine the cyclic deformation behavior of a high-pressure die-cast Silafont (R)-36 automotive alloy and investigate the effects of strain ratio on cyclic hardening behavior and fatigue life. The experimental results showed that the degree of cyclic hardening increased with decreasing strain ratio and the fatigue life of the alloy was slightly lower at positive strain ratios compared to other strain ratios.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: In this study, the micro-deformation mechanisms in an Al-Si cast alloy under stepwise compressive loading were investigated using EBSD and slip trace analyses. The presence of heterogeneous microstructural features significantly influenced the slip trace characteristics. Four types of slip traces in primary α-Al grains were identified, revealing the nature of dislocation motion and the extent of deformation difficulty associated with grain orientations and eutectic Si particles. Crystallographic factors were analyzed to understand the deformation behavior of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
S. S. Dash, D. J. Li, X. Q. Zeng, D. Y. Li, D. L. Chen
Summary: The aim of this study is to investigate the monotonic and cyclic deformation behavior of a high-pressure die cast Silafont (R)-36 alloy in a naturally-aged T4 state. The T4 heat treatment led to significant microstructural changes, resulting in the transformation of coralloid-like eutectic Si particles to spheroidal Si particles embedded in the Al matrix. The T4 alloy exhibited strong cyclic hardening and a longer low cycle fatigue life compared to its as-cast state at lower strain amplitudes, attributed to particle-dislocation interactions during deformation. A strain energy density-based model incorporating microstructural aspects can be used to predict the fatigue life of the T4 alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Quan Li, Mingyu Gong, Jiancheng Jiang, Yiwen Chen, Houyu Ma, Yujuan Wu, Yongxiang Hu, Yue Liu, Guisen Liu, Jian Wang, Xiaoqin Zeng
Summary: We quantitatively measured the twinning shear of three twinning modes at an atomic level, allowing us to determine the character of elementary twinning dislocation. These findings not only clarify the twinning mechanisms but also provide a method to determine other complex shear mechanisms at an atomic level.
Article
Materials Science, Multidisciplinary
Fanjin Yao, Dejiang Li, Zixin Li, Bo Hu, Yu Huang, Xiaoqin Zeng
Summary: Alloying can deteriorate the thermal conductivity of pure metals, and composite materials are the inevitable choice to optimize the thermal conductivity of alloys. Multiwalled carbon nanotubes (MWCNTs) were used to achieve Mg-based composites with ultra-high thermal conductivity surpassing pure Mg, optimized mechanical properties, and superior lightweight. The thermal conductivity of the Mg-4Sm-2Al (SA42) matrix composites dramatically surpassed pure Mg by introducing 2 vol% MWCNTs. The addition of MWCNTs improved the yield strength, ultimate tensile strength, and elongation of the composites. The thermal conductivity and mechanical properties were studied through thermal conductivity models and microstructures. These findings provide new insights for designing composites with superior thermal conductivity surpassing the pure matrix and exhibiting an integrated structure-function.