Article
Thermodynamics
J. Zhang, Y. Yao, L. He, X. J. Zhou, L. P. Yu, X. Z. Lu, P. Peng
Summary: This study systematically investigated the hydrogen storage properties of Mg98.5Y1Zn0.5 alloys in different states, finding that the activated as-cast and ECAP processed samples showed superior kinetics compared to the homogenized one, with the as-cast sample exhibiting even better performance than the ECAP processed one. The more uniform dispersion of YH2 nanohydride in the as-cast alloy significantly enhanced the reversible hydrogen storage properties of Mg matrix.
Article
Materials Science, Multidisciplinary
R. S. Jin, J. Zhang, X. J. Zhou, S. X. Pan, J. H. He, J. N. Chen, X. Z. Lu, X. M. Chen, D. W. Zhou
Summary: In this study, the microstructures and hydrogen storage properties of Mg-Y-Zn alloys with different Zn content were systematically investigated. The results indicate that the formation of LPSO phases increases with higher Zn content, mainly located at the grain boundaries. The distribution of YH2/YH3 hydrides in these alloys becomes non-uniform due to the higher concentration at grain boundaries with increasing Zn content, resulting in poorer hydrogen storage performance.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yingying Chen, Enci Zuo, Xilong Dou, Li Chen, Aijie Mao, Gang Jiang
Summary: The dynamical, mechanical, anisotropic, and thermodynamic properties of Mg-XL-Y (XL = Zn, Al) alloys based on three long-period stacking ordered (LPSO) phases (ie, 10H, 14H, and 18R) have been systematically investigated by first-principles calculations. The LPSO phases of Mg-XL-Y (XL = Zn, Al) alloys are stable in terms of thermodynamics, dynamics, and mechanics. The Mg-Al-Y alloys exhibit superior mechanical properties compared to Mg-Zn-Y alloys, with larger resistances to deformation, stiffness, and hardness.
Article
Nanoscience & Nanotechnology
Xiaodong Yang, Xiaojie Zhou, Shilun Yu, Jian Zhang, Xianzheng Lu, Xiaomin Chen, Liwei Lu, Weiying Huang, Yaru Liu
Summary: The tensile behavior of extruded and peak-aged Mg-5Gd-3Y-xZn-0.5Zr alloys was investigated in terms of microstructural evolution, deformation modes, and mechanical properties at temperatures ranging from -100℃ to 300℃. The study found that the Zn content affected the distribution of intragranular and interdendritic phases, which in turn influenced the mechanical properties of the alloys. Additionally, the deformation modes during tensile testing were influenced by factors such as testing temperature, grain orientation, and LPSO morphology.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Guoqin Wu, Zhaocan Li, Jianmin Yu, Hongbing Hu, Yali Duan, Beibei Dong, Zhimin Zhang
Summary: The texture evolution mechanism of Mg-13.1Gd-3.9Y-2Zn-0.4Zr (wt%) alloys during reciprocating upsetting extrusion and subsequent heat treatment was investigated. The influence of deformation passes on texture weakening and deformation mechanism was discussed. The results showed that the basal texture intensity decreased with increased deformation passes and significantly decreased after T6 heat treatment. The anisotropy of the alloys was maintained after T5 treatment and eliminated after T6 treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jiaxin Zhang, Xin Ding, Ruirun Chen, Wenchao Cao, Yanqing Su, Jingjie Guo
Summary: A Mg96Y2Zn2 alloy with a high proportion of long period stacking ordered (LPSO) structure was prepared, and it formed a YH2 + Mg(Zn) composite after hydrogen ab/desorption, exhibiting lower desorption temperature and enhanced hydrogen storage capacity compared to pure MgH2. The hydrogenation process of the alloy was governed by one-dimensional diffusion rate of hydrogen atoms, while the dehydrogenation process was dominated by two-dimensional interface movement of the metal/hydride phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Mingyu Li, Guangzong Zhang, Siqi Yin, Changfeng Wang, Renguo Guan
Summary: This paper calculates and analyzes the electronic and optical properties of the long-period stacking order (LPSO) phase in Mg-Y-Zn alloy using first principles. The results show that the LPSO phases have metallic characteristics and no energy gap. The 14 H phase is thermodynamically more stable than the 18 R phase due to stronger covalent bonds. Both phases exhibit high absorption coefficients within the energy range of 0-19 eV, with the strongest absorption peaks occurring at photon energies of 4.48 eV and 4.8 eV for the 14 H and 18 R phases, respectively. The photon absorption rate is inversely proportional to the density of L12 clusters in both phases.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Shiyu Luan, Lei Zhang, Lijia Chen, Wei Li, Jinhui Wang, Peipeng Jin
Summary: The hot tensile behaviors of two Mg-4Gd-1Zn-0.5Mn alloys with different LPSO volume fractions were investigated, and it was found that LPSO phase has a positive effect on strengthening the mechanical properties of the alloy by hindering non-basal slip and promoting pyramidal slip.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Mozhgan Shokri, Abbas Zarei-Hanzaki, Hamid Reza Abedi, Jae Hyung Cho
Summary: The study investigated the correlation between microstructure/texture evolutions and high temperature flow behavior in Mg alloy containing long period stacking order (LPSO) phases. The annealing treatment effectively strengthened the alloy and decreased ductility, with blocky LPSO assisting dynamic recrystallization and lamellar LPSO increasing alloy strength. The findings suggest that microstructure and texture evolution play a significant role in the high-temperature behavior of the Mg alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Xiaojie Zhou, Wenying Xiong, Gang Zeng, Hongchao Xiao, Jian Zhang, Xianzheng Lu, Xiaomin Chen
Summary: The combined effects of LPSO orientation and alpha-Mg texture on tensile anisotropy were investigated, with the extrusion direction showing optimal mechanical properties, the 45 degrees direction exhibiting high elongation, and the transverse direction having inferior strength and elongation simultaneously. LPSO orientation contributes to strength anisotropy through different load-bearing strengthening effects along different tensile axes, while alpha-Mg texture contributes to strength anisotropy through stronger grain boundary strengthening effects. However, LPSO orientation, rather than alpha-Mg texture, accounts for ductility anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
S. X. Pan, J. Zhang, X. J. Zhou, R. S. Jin, J. H. He, J. N. Chen, X. Z. Lu, X. M. Chen
Summary: The compositions, microstructures, and hydrogen storage properties of Mg-9.1Y-1.8Zn alloys in three different states were investigated. The results showed that the alloys were composed of Mg and long-period stacking ordered (LPSO) phases. LPSO phases broke and decomposed after hydrogenation, forming in-situ YH1.8 to YH2.3 nano-hydrides. These nano-hydrides acted as in-situ catalysts, improving the hydrogen storage properties of the alloys. The swaged alloy exhibited the largest hydrogen storage capacity and excellent hydrogen sorption kinetics compared to the other states of alloys.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Xiangsheng Xia, Dayu Shu, Echuan Yang, Chuankai Hu
Summary: The microstructures and mechanical properties of Mg-8.5Gd-4.5Y-0.3Zr alloys with and without Zn addition were investigated in this study, and the strengthening mechanisms of these two alloys were also discussed. The results show that the as-extruded alloy with Zn addition has finer grains due to the inhibited dislocation motion. Dynamic precipitation occurs during the extrusion process and unevenly distributes in both alloys, promoting grain refinement. The alloy with Zn addition exhibits significantly higher yield strength and elongation compared to the alloy without Zn addition, mainly attributed to the strengthening effects of the LPSO and g0 phases.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Z. Aalipour, A. Zarei-Hanzaki, A. Moshiri, H. R. Abedi, Daudi Waryoba, A. Kisko, L. P. Karjalainen
Summary: The microstructure and microtexture changes of an extruded and annealed magnesium alloy were investigated under different strain and processing conditions. The results showed that the material underwent noticeable refinement even at low applied compressive strain. Recrystallization process was completed at a true strain of 0.3, and grain refinement was attributed to the LSN and CDRX mechanisms. At higher strain levels, most grains were found in deformed states and the microtexture only changed in terms of intensity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Coatings & Films
Vaithiyalingam Shutthanandan, Abraham Martinez, Tamas Varga, Arun Devaraj, Swadipta Roy, Elizabeth Stephens, Olga A. Marina, Suntharampillai Thevuthasan, Vijayakumar Murugesan, Vineet Joshi
Summary: Magnesium and its alloys are potential structural material candidates due to their high strength-to-weight ratio, but ductility and poor corrosion resistance limit industrial deployment. In order to understand the corrosion process, designing passivation layers and corrosion-resistant alloys is necessary. Experimental findings include the formation of magnesium chloride hydroxide hydrate and evidence of metastable ClO* radicals during aqueous salt corrosion processes.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Materials Science, Multidisciplinary
Hailian Wang, Yunxuan Zhou, Quan Dong, Xianhua Chen, Jun Tan
Summary: This study investigates the thermodynamic, mechanical, and electronic properties of Mg-Al-Si ternary compounds using first-principle density functional theory. The results show that these compounds are dynamically and thermodynamically stable. Furthermore, the mechanical properties of these compounds are enhanced with decreasing Mg content, which is beneficial for increasing the stiffness of Mg alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
