Article
Chemistry, Physical
Jia Zhao, Chen You, Minfang Chen, Shaoyuan Lyu, Di Tie, Haifeng Liu
Summary: The grain size of AZ91 alloy decreases non-linearly with the increase of CaO particle size. The in-situ replacement reaction between CaO and Mg matrix improves mechanical properties and corrosion resistance, while nano-CaO particles affect the performance of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
S. Fajardo, L. Miguelez, M. A. Arenas, J. de Damborenea, I Llorente, S. Feliu
Summary: The effect of laser surface melting on the corrosion resistance of AZ31 Mg alloy was investigated. The results showed that laser treatment significantly increased the corrosion resistance of the alloy, which could be attributed to the increased surface concentration and the formation of a passive-like region.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Metallurgy & Metallurgical Engineering
Yingrui Liu, Kemin Zhang, Jianxin Zou, Ping Yan, Xu Zhang, Luxia Song
Summary: The study investigated the surface modification of a Mg-4Sm-2Al-0.5Mn alloy using HCPEB, leading to the gradual dissolution of Al11Sm3 and Al2Sm phases in the surface layer. After 15 pulses treatment, the surface hardness significantly increased, showing the best corrosion resistance.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Engineering, Biomedical
Jacob Manthe, Kai Yuan Cheng, Divya Bijukumar, Mark Barba, Robin Pourzal, Mozart Neto, Mathew T. Mathew
Summary: This study investigated the fretting-corrosion behavior of cobalt-chromium-molybdenum (CoCrMo) alloy with specific microstructural features. The results showed that the banded microstructure was more susceptible to corrosion damage compared to the unbanded microstructure under certain electrolyte conditions.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Chemistry, Physical
Bangjun Li, Jiapeng Sun, Bingqian Xu, Guosong Wu
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
Jing Han, Cong Wang, Yuanming Song, Zhiyuan Liu, Jiapeng Sun, Jiyun Zhao
Summary: The ultrasonic surface rolling (USR) technique has been used to improve the corrosion resistance and mechanical properties of Mg alloy casting parts. The USR sheet exhibits significant enhancements in strength, hardness, and corrosion resistance without sacrificing ductility. This method can be considered as an additional and last working procedure in the production of high-performance Mg alloy casting parts.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Materials Science, Coatings & Films
Xiaopeng Lu, Jirui Ma, Marta Mohedano, Borja Pillado, Raul Arrabal, Kun Qian, Yan Li, Tao Zhang, Fuhui Wang
Summary: The study showed that sealing plasma electrolytic oxidation (PEO) coatings on AZ91 Mg alloy in calcium nitrate solutions at different pH values can enhance the corrosion resistance of the coatings. Adding SDS facilitates the formation of precipitates, resulting in hydrophobic coatings with poorer paint adhesion but better corrosion resistance.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Electrochemistry
Linqian Wang, Darya Snihirova, Meisam Dabiri Havigh, Min Deng, Sviatlana V. Lamaka, Herman Terryn, Mikhail L. Zheludkevich
Summary: This study investigates the non-stationarity of EIS measurements on Mg-based materials in aqueous media. The results show that the impedance spectra of Mg-based materials are affected by both internal and external non-stationarity. Multisine odd random phase EIS measurements reveal the non-stationarity and non-linearity of the system.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Multidisciplinary
Akeel Dhahir Subhi, Hussein Ali Hussein
Summary: The AZ91 Mg alloy was surface melted using a DPSS Nd:YVO4 laser with different pulse lengths. Characterization of the alloy and laser melted layers was done using XRD, SEM, and EDS. The impact of laser surface melting (LSM) on hardness and corrosion characteristics was investigated through hardness testing and potentiodynamic polarization test. Results showed that LSM reduced the crystallite size of alpha-Mg and increased hardness. Moreover, LSM improved the corrosion resistance of the Mg alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Metallurgy & Metallurgical Engineering
S. Al Bacha, I. Aubert, M. Zakhour, M. Nakhl, J. L. Bobet
Summary: The hydrolysis of Mg-based materials is an ideal solution for clean energy production, with AlCl3 identified as the most effective ball milling additive to enhance the reaction. The best results were achieved by milling AZ91 at 350 rpm, reaching an efficiency of 75% of its theoretical H2 generation capacity.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Chemistry, Analytical
Lei Cheng, Rong Jin, Dechen Jiang, Jian Zhuang, Xiaobo Liao, Qiangqiang Zheng
Summary: High-spatial-resolution local electrochemical impedance spectroscopy (LEIS) was achieved using scanning electrochemical cell microscopy (SECCM-LEIS), with a spatial resolution of approximately 180 nm. The stability and reliability of this platform were confirmed through long-term tests and Kramers-Kronig transformation. This technology revealed larger electric double-layer capacitance and smaller interfacial resistance at the edges of N-doped reduced graphene oxide compared to the planar surface, suggesting high electrochemical activity at the edges.
ANALYTICAL CHEMISTRY
(2021)
Article
Multidisciplinary Sciences
Venkateshkumar Prabhakaran, Lyndi Strange, Rajib Kalsar, Olga A. Marina, Piyush Upadhyay, Vineet V. Joshi
Summary: Developing strategies to prevent corrosion at the interface of dissimilar metal alloys is challenging. This study utilized scanning electrochemical cell impedance microscopy (SECCIM) to investigate the corrosion in the interfacial region of AZ31 magnesium alloy and DP590 steel welded using the Friction-stir Assisted Scribe Technique (FAST). The research found that the interfacial region differs chemically and microstructurally from bare AZ31 and DP590, and by measuring corrosion kinetics and electrochemical impedance spectroscopy, deeper insights into the interfacial region were gained, which can help prevent corrosion in dissimilar metal structures.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Linqian Wang, Darya Snihirova, Min Deng, Cheng Wang, Bahram Vaghefinazari, Gert Wiese, Mark Langridge, Daniel Hoeche, Sviatlana Lamaka, Mikhail L. Zheludkevich
Summary: Electrochemical impedance spectroscopy measurements were used to study the surface evolution of magnesium in 0.05 M NaCl solution at three different pH levels. The thickness of the MgO film was calculated based on the assumption that the high frequency time constant originates from the surface film. Comparisons with actual surface conditions confirmed that the high frequency time constant is related to the barrier properties of the surface film.
Article
Materials Science, Multidisciplinary
Saumyadeep Jana, Matt Olszta, Danny Edwards, Mark Engelhard, Avik Samanta, Hongtao Ding, Pratik Murkute, O. Burkan Isgor, Aashish Rohatgi
Summary: Laser surface processing improved the corrosion resistance of AZ31 alloy by forming a mixed metal oxide surface film and refining the size and number density of intermetallic particles.
Article
Materials Science, Multidisciplinary
Xin Lv, Kunkun Deng, Cuiju Wang, Kaibo Nie, Xiaogang Wang, Quanxin Shi
Summary: The effect of submicron SiCp content on the corrosion resistance of homogenized AZ91 alloy was investigated. The results showed that the addition of 0.5 vol.% submicron SiCp significantly improved the corrosion resistance, reducing the weightless corrosion rate from 4.44 mm/y to 0.68 mm/y. However, the corrosion resistance decreased with increasing submicron SiCp concentration.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Yi-dan Fan, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi
Summary: Pure titanium particles reinforced Mg-6Zn-0.2Ca magnesium matrix composites were successfully fabricated and their mechanical properties were studied. The results showed that the titanium particles promoted dynamic recrystallization of the matrix alloy, refining the size of MgZn2 phases and resulting in high yield strength and ultimate tensile strength in the composite. However, the work hardening rate of the composite decreased during plastic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
J. H. Zhang, K. B. Nie, K. K. Deng, X. Z. Han, Z. D. Wang
Summary: The effect of adding trace elements of Nd to Mg-3Zn-0.5Zr alloy was studied. It was found that Nd content significantly influenced the composition and distribution of the second phase in the alloy. The introduction of Nd resulted in a decrease in grain size and grain boundary strengthening, as well as an increase in texture intensity. High strength alloys with low alloying content and traditional extrusion processes were obtained.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Ren Jie Dai, Kun Kun Deng, Cui Ju Wang, Kai Bo Nie, Guo Wei Zhang, Wei Liang
Summary: AE alloy and AS alloy were obtained by extrusion and solution treatment of Zn-rich aluminum alloy. AE alloy has fine grains and high precipitate content, while AS alloy has increased grain size and dissolved precipitates. Both alloys show improved mechanical properties, but AE alloy has higher work hardening capacity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Wei Li, Kaibo Nie, Zhilong Liu, Kunkun Deng, Yanan Li, Xili Tong
Summary: The addition of SiC nanowires affected the microstructure and mechanical properties of Mg-2Zn-0.1Y matrix composites under different hot extrusion parameters. Stengthening mechanism was analyzed and the results showed significant changes in grain size and volume fraction with variations in extrusion temperature and speed.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xin Lv, Kun-Kun Deng, Cui-Ju Wang, Kai-Bo Nie, Quan-Xin Shi, Wei Liang
Summary: The addition of trace submicron SiC particles can promote the formation of lamellar (α+β) structure and improve the corrosion resistance of the alloy. However, the precipitation of granular β-Mg17Al12 phase with increased SiCp content leads to a gradual decrease in corrosion resistance.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Zedong Wang, Kaibo Nie, Kunkun Deng, Jungang Han
Summary: A low-alloyed Mg-2Zn-0.8Sr-0.2Ca matrix composite reinforced by TiC nano-particles was successfully prepared by semi-solid stirring under the assistance of ultrasonic, and then the as-cast composite was hot extruded. The finest grain size of similar to 0.30 mu m is obtained in the sample extruded at 200 degrees C and 0.1 mm/s. The ultra-high mechanical properties (ultimate tensile strength of 480.2 MPa, yield strength of 462 MPa) are obtained after extrusion at 200 degrees C with a rate of 0.1 mm/s. Among all strengthening mechanisms for the present composite, the grain refinement contributes the most to the increase in strength. A mixture of cleavage facets and dimples were observed in the fracture surfaces of three as-extruded nanocomposites, which explain a mix of brittle-ductile fracture way of the samples.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hongwei Li, Kaibo Nie, Zhilong Liu, An Yang, Kunkun Deng
Summary: TiCp/Mg-Al-Ca-Mn nanocomposites were produced through extrusion, which resulted in refined grains and changes in the second phase. The composites exhibited specific texture composition and their properties were influenced by the degree of dynamic recrystallization and precipitates. The nanocomposites showed excellent mechanical properties, which were enhanced by various strengthening mechanisms.
Article
Materials Science, Multidisciplinary
Shilei Wang, Kaibo Nie, An Yang, Kunkun Deng
Summary: The influence of different Ca/Al mass ratios on the microstructure, phase evolution, and mechanical properties of Mg-Al-Ca-Mn alloys was investigated. It was found that increasing the Ca/Al ratio led to the transformation of the secondary phases and refinement of the grain size. The secondary phases not only refined the grains but also hindered dislocation migration, resulting in the strengthening of the alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
Mei-li Hou, Kun-kun Deng, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi
Summary: The effects of the VR/VD ratio on the work hardening and softening behaviors of Mg-6Zn-1Gd-0.12Y alloy were studied. It was found that increasing the VR/VD ratio reduced the work hardening rate in stage III, while increasing it in stage IV. A low VR/VD ratio improved the work hardening rate in stage III, while a high VR/VD ratio improved it in stage IV. With an increased VR/VD ratio, the softening behavior of the alloy increased in stage III and decreased and then increased in stage IV.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Electrochemistry
Xin Lv, Kunkun Deng, Cuiju Wang, Kaibo Nie, Quanxin Shi, Haoyi Niu
Summary: Through immersion, electrochemical, and Mg-air battery tests on extruded AZ91 alloy and 0.5 μm SiCp (0.5 vol.%)/AZ91 composite, it is found that the introduction of submicron SiCp can reduce the corrosion rate and improve the discharge performance of the alloy. This improvement is attributed to the refined grains, precipitates, and weakened basal texture resulting from the addition of submicron SiCp. This study provides new ideas for achieving the synergistic improvement of corrosion resistance and discharge performance of magnesium alloy.
ELECTROCHIMICA ACTA
(2023)
Article
Materials Science, Composites
Li Zhang, Kun-kun Deng, Kai-bo Nie, Cui-ju Wang, Chao Xu, Quan-xin Shi
Summary: GFs/ZX50 (graphite flakes/Mg-5Zn-0.5Ca) composites were successfully fabricated by ultrasonic-assisted semi-solid stirring followed by extrusion process. The microstructure observation shows that hot extrusion effectively regulates the orientation of GFs. The GFs/ZX50 composites exhibit excellent thermal conductive property of -145.6-174.2 W/(m center dot K) and high yield strength of -386.8-407.8 MPa. The excellent strength-thermal conductivity synergy of the composites is mainly attributed to the highly orientated GFs, the clean Mg-graphite interface, the ultrafine grains, and the MgZn2 nano-precipitates.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Quan-xin Shi, Cui-ju Wang, Kun-kun Deng, Yi-dan Fan, Kai-bo Nie, Wei- Wei-Liang
Summary: The present work investigates the impact of bimodal microstructure on the work hardening and softening behaviors of Mg-6Zn-1Gd-0.3Ca alloy. The study also discusses the grain refinement mechanism through EBSD analysis. The results reveal that the work hardening capacity of the alloy increases with the volume fraction of fine recrystallized grains due to increased dislocation storage rate caused by grain coarsening. The stress reduction value in the early stage of deformation is the highest for the alloy with fine recrystallized grains, providing a greater driving force for softening effect. However, the stress reduction values decrease with the increase of fine recrystallized grains in the later stage of deformation. Furthermore, the analysis indicates that dynamic recrystallization plays a significant role in the formation of fine recrystallized grains in the Mg-6Zn-1Gd-0.3Ca alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xin Lv, Kunkun Deng, Cuiju Wang, Kaibo Nie, Xiaogang Wang, Quanxin Shi
Summary: The effect of submicron SiCp content on the corrosion resistance of homogenized AZ91 alloy was investigated. The results showed that the addition of 0.5 vol.% submicron SiCp significantly improved the corrosion resistance, reducing the weightless corrosion rate from 4.44 mm/y to 0.68 mm/y. However, the corrosion resistance decreased with increasing submicron SiCp concentration.
MATERIALS TODAY COMMUNICATIONS
(2023)
