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Article
Chemistry, Applied
Guangli Bi et al.
Summary: This study reported a yield phenomenon in an extruded Mg-6.8Y-2.5Cu alloy and investigated its corresponding microstructure. After extrusion, the grain size of the alloy was refined and the second phase was broken and distributed in the extrusion direction. Tensile testing showed that the yield strength and ultimate tensile strength increased while the elongation decreased with increasing strain rate. The yield phenomenon was attributed to dislocation multiplication and the interaction between movable dislocations and solute atoms.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Physical
Yaohong Liu et al.
Summary: The effect of Cu micro-alloying on the microstructure, mechanical and corrosion properties of Mg-9.5Gd-2.7Y-0.9Zn alloys was investigated. The increase of Cu contents promoted the nucleation of dynamic recrystallized grains but suppressed their growth. The addition of 0.8 wt% Cu resulted in higher yield strength due to multiple strengthening contributions. The LPSO phase acted as a cathodic to accelerate corrosion, and the 0.8Cu alloy exhibited the highest corrosion rate.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Z. Tanhaee et al.
Summary: In this study, the microstructure and high-temperature behavior of cast Mg-8 wt% Mg2Si in situ composites with 0, 0.5, 1, 2, and 3 wt% Gd were investigated. Mechanical properties of the composites were examined in the temperature range of 25-250 degrees C. The addition of Gd resulted in the modification of Mg2Si particles, reducing their size and volume fraction, and the formation of new intermetallic phases and solid solution in the Mg matrix. The composite with 1% Gd addition showed the highest strength due to the presence of finer Mg2Si particles with polygonal morphology. However, higher Gd contents led to decreased strength due to the over-modification effect of Gd, causing the coarsening of Mg2Si particles.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Guoqiang Xi et al.
Summary: This research investigated the loading-direction dependence of interaction types between different twin variants in AZ31 alloy. The microstructure, twin evolution, and deformation mechanisms were analyzed using quasi in-situ electron backscatter diffraction. The results showed that the majority of grains exhibited co-zone twin-twin interaction (Type I) during rolling direction (RD)-pre-compression and re-compression, while non-cozone twin-twin interaction (Type II) grains were dominant during RD-pre-compression and transverse direction (TD)-re-compression. The different types of twin-twin interaction were found to have an impact on subsequent microstructure evolution.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyan Fang et al.
Summary: The effects of non-basal slip and twinning modes on the mechanical behavior and texture evolution of AZ31 alloys during room temperature compression were investigated. Experimental and VPSC modeling results showed that pyramidal slip and {10-11} contraction twinning reduced the strain hardening rate in the later stage of compression. Prismatic slip had a significant effect on the strain hardening rate, while {10-12} extension twinning significantly reduced the strain hardening rate and compressive yield strength. Increased activity of {10-11} contraction twinning caused pole density transfer to the normal direction in the {0002} pole figure.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Guoqiang Xi et al.
Summary: Rare earth elements have a significant impact on the microstructure and properties of advanced magnesium alloys. This study investigates the corrosion behavior of Mg-Zn-Y and Mg-Zn-Gd alloys with the same atomic percentage of alloying elements. The results show that the Mg-Zn-Y alloy exhibits a lower corrosion rate and higher corrosion resistance compared to the Mg-Zn-Gd alloy, attributed to its lower corrosion current density and the relative high corrosion resistance of the corrosion product layer.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Metallurgy & Metallurgical Engineering
Z. Z. Peng et al.
Summary: To optimize the mechanical properties of LPSO-containing Mg alloys, a Mg-Zn-Y-Zr alloy with intragranular and free grain boundary LPSO phases was successfully prepared by homogenization. The strengthening and toughening mechanisms were unraveled through transmission electron microscopy characterization and theoretical analysis, revealing the synergistic deformation mechanism of multiple kinking and twinning in the grains. The activation of kinking and twinning depended on the thicknesses of LPSO lamellae and their relative spacing, providing insights for optimizing the design of Mg alloys regulating the microstructure of LPSO phases.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Metallurgy & Metallurgical Engineering
Guo-qiang XI et al.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Nanoscience & Nanotechnology
S. Z. Wu et al.
Summary: The microstructure and mechanical properties of Mg-Y-Ni alloys with different volume fractions of block-shaped LPSO phase and number densities of plate-shaped gamma' phase were investigated. It was found that the increased volume fraction of LPSO phase improved the tensile yield strength of the alloys, while the plate-shaped gamma' phase also provided effective strengthening. The alloy with the highest volume fraction of block-shaped LPSO phase and number density of plate-shaped gamma' phase exhibited superior tensile yield strength after extrusion.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jinshu Xie et al.
Summary: Formation of solute-enriched stacking faults (SESFs) and their transformation into long period stacking ordered (LPSO) phase in Mg alloys have been achieved in this study. The role and advantages of SESFs and LPSO phase were confirmed by experimental observations. These findings are significant for the development of high-strength and anti-corrosion Mg alloys.
Article
Materials Science, Multidisciplinary
Duofei Zheng et al.
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
Nanoscience & Nanotechnology
Zhiyu Chang et al.
Summary: This study characterized and analyzed the microstructure and mechanical properties of Mg alloy castings prepared by rheo-diecasting and compared them with conventional diecasting. The solution-treated rheo-diecast alloy showed a significant improvement in elongation but a decrease in room-temperature tensile mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Zijian Yu et al.
Summary: The mechanical performance of the studied alloys was significantly influenced by the precipitation of the gamma' phase, which was regulated by the addition of Ca and the cooling method during the T4 treatment.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Metallurgy & Metallurgical Engineering
Xian-man Zhang et al.
Summary: This work provides an overview of recent progress in understanding the degradation mechanism and improving the corrosion resistance and corrosion-wear resistance of materials in marine environments. The particular emphasis is given to the anti-corrosion properties of periodic layered structures (PLSs). Numerical simulation and experimental analysis reveal the micro-galvanic corrosion dominated degradation mechanism of PLSs. Various laboratory setups for corrosion-wear studies are also summarized. Future research and development prospects for the application of PLSs in corrosion protection methodology are discussed.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2022)
Article
Metallurgy & Metallurgical Engineering
Wujun Yin et al.
Summary: The high elastic modulus and deformation kinks of the long period stacking ordered (LPSO) phase in Mg-Zn-Y alloys significantly enhance the tensile yield strength, with a slight detriment or benefit to the ductility. Extrusion processing improves both strength and ductility through recrystallization of Mg grains. The activation of different plastic deformation mechanisms depends on the volume fraction and relative size of Mg and LPSO phases.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Kakeru Ninomiya et al.
Summary: This study investigated the formation of L12 clusters and the interactions between transition metal (TM) and rare-earth (RE) atoms in magnesium-based alloys. X-ray absorption spectroscopy (XAS) and ab initio calculations were used to analyze the alloy before and after aging. The results showed that rare-earth elements play a crucial role in the formation of L12 clusters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Siyuan Jin et al.
Summary: By adding carbonate to the silicate system electrolyte, the corrosion resistance of the plasma electrolytic oxidation coating on Mg-9Li-3Al alloy was improved. The addition of carbonate resulted in a denser coating with increased hardness, and the formation of the corrosion-resistant Li2CO3 phase.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Engineering, Mechanical
Tsuyoshi Mayama et al.
Summary: The influence of alpha-Mg/LPSO phase interfaces on the flow stress of as-cast Mg-Zn-Y alloys was experimentally and numerically evaluated. The results showed that the flow stresses of Mg-Zn-Y alloys with LPSO phase fractions ranging from 40 to 85% were higher than those of single phase alpha-Mg or LPSO alloys. Comparison between Mg-Zn-Y alloys and Mg-Zn-Y-Zr alloys revealed that the flow stresses of Mg-Zn-Y alloys with LPSO phase fractions of 25 and 40% were insensitive to grain size, while the flow stress of alpha-Mg single-phase alloy showed clear grain size dependence. Crystal plasticity analysis successfully reproduced the observed stress-strain behavior, indicating that alpha-Mg/LPSO phase interfaces are effective obstacles against dislocation slip in two-phase Mg alloys containing LPSO phase.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Guoqiang Xi et al.
Summary: This study investigates the interaction and evolution of {10 (1) over bar2} twinning with {30 (3) over bar4} twin in magnesium alloy through crystallographic analysis and high-resolution transmission electron microscopy observations. It was found that {30 (3) over bar4} twin can completely cut through {10 (1) over bar2} twin and triggers the formation of new {10 (1) over bar3} twin.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
L. D. Xu et al.
Summary: This study reveals the oxidation behavior of Mg-Y-Zn LPSO phase at different temperatures through analysis and calculations. The results show that Y2O3 is mainly formed at a low temperature, while MgO is preferentially formed at a high temperature. This study is of great importance for the development of oxidation-resistant LPSO-containing Mg alloys.
Article
Chemistry, Physical
Bangjun Li et al.
Summary: This paper investigates the corrosion behavior of Mg-5.7Gd-1.9Ag alloy sheets in a salt solution. The results show that the rolled sheets exhibit better corrosion resistance compared to the as-cast sheets. Aging treatment decreases corrosion resistance, but it still remains higher than that of the as-cast sheets. The migration of corrosion is mainly influenced by the evolution of second phases rather than grain size and texture.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jiyu Li et al.
Summary: This study designed microstructures with different interspacings of intragranular lamellar long period stacking ordered (LPSO) phase by altering the cooling rate after solid solution heat treatment, and investigated the effect of the interspacing on the dynamic recrystallization (DRX) of Mg-Gd-Y-Zn-Zr alloy. It was found that closely spaced intragranular LPSO lamellae suppress DRX. The underlying mechanism was further revealed using EBSD analyses and TEM characterizations.
MATERIALS CHARACTERIZATION
(2022)
Review
Metallurgy & Metallurgical Engineering
Jian Sun et al.
Summary: The vulnerable corrosion resistance of Mg alloys is regarded as one of their main disadvantages, but it can also be beneficial in certain fields such as petroleum exploitation and medicine. This review provides an overview on the performance requirements and corrosion behavior of degradable Mg alloys, including Mg-Al, Mg-Zn, Mg-RE alloys, and Mg matrix composites, which have been developed for fracturing temporary plugging tools in the oil industry. The factors influencing the degradation rate of Mg alloys, such as secondary phase, texture, dislocation, grain size, and surface film, are analyzed. The addition of Ni or Cu to the degradable Mg alloys is found to be an effective method to enhance the degradation rate.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Metallurgy & Metallurgical Engineering
Xiao-chun MA et al.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Shiyu Zhong et al.
Summary: By adding copper (Cu) to Mg-2Gd alloy, more Mg2Cu second phases were precipitated, resulting in refined grain size and changing texture. This led to enhanced hardness, tensile strength, compressive strength, and degradation rate, while reducing strain hardening rate and elongation. However, the elongation still remained at least 20%. Overall, the comprehensive mechanical properties and degradation rate of Mg-2Gd alloy were effectively coordinated by Cu addition.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Wei Tan et al.
Summary: Specially designed Mg-Cu-Al alloys have shown improved compressive strength and ductility, with the addition of Al enhancing the mechanical properties of the Mg-Cu alloys. The presence of second-phases in the alloys contributes to micro-galvanic corrosion and high degradation rate.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Review
Energy & Fuels
Benyamin Yadali Jamaloei
Summary: The Montney tight siltstone reservoir is a multi-stacked play covering a large area along the Alberta-British Columbia border. Previous studies on fracturing methods in Montney had limitations such as small sample sizes, limited scope, reliance on data analytics with limited subsurface insight, and potentially misleading results. The current study rigorously clusters Montney wells to isolate the effect of each fracturing method and highlights the effectiveness of pinpoint fracturing method in certain scenarios.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
J. Wang et al.
Summary: Magnesium alloys have attracted more attention recently as a novel functional material for the fabrication of fracturing tools due to their relatively high mechanical properties and fast dissolubility ability. The addition of nickel influences phase precipitation behaviors and mechanical properties of the alloys. The invention of these alloys provides more material alternatives for the fabrication of dissoluble fracturing tools.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Materials Science, Multidisciplinary
Siqi Yin et al.
Article
Metallurgy & Metallurgical Engineering
Jingfeng Wang et al.
JOURNAL OF MAGNESIUM AND ALLOYS
(2020)
Article
Materials Science, Multidisciplinary
Hao-yi Niu et al.
MATERIALS CHEMISTRY AND PHYSICS
(2020)
Article
Metallurgy & Metallurgical Engineering
Qiu Zhang et al.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2020)
Article
Energy & Fuels
Jia-Qi Che et al.
Article
Chemistry, Physical
Hao-yi Niu et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Review
Chemistry, Physical
Murad Ali et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Chemistry, Physical
Kosuke Takagi et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Materials Science, Multidisciplinary
Yuezhong Zhang et al.
Review
Materials Science, Multidisciplinary
M. Esmaily et al.
PROGRESS IN MATERIALS SCIENCE
(2017)
Article
Energy & Fuels
Chao Zheng et al.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2016)
Article
Energy & Fuels
Pei Xiaohan et al.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2014)
