Article
Materials Science, Multidisciplinary
Shuaiying Xi, Guodong Ma, Lu Li, Yuanbo Zhang, Xiangyang Yu, Yongkun Li, Rongfeng Zhou
Summary: This paper systematically analyzed the microstructures and mechanical properties of die-cast 4 wt%TiB2/Al-9Si-3Cu-0.8Zn composite, and found that the introduction of TiB2 reinforcing phase significantly enhanced the mechanical properties, especially after T6 heat treatment.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Qiangbing Liu, Jiaxuan Ma, Shiyu Luan, Jinhui Wang, Shuai Yuan, Li Han, Peipeng Jin
Summary: The temperature damping capacities of Mg-3Al-1Zn-xSn alloys were investigated using a DMA, and the effects of Sn concentration and loading frequency were examined. The addition of Sn resulted in shifts in the damping peaks, indicating the influence of second phases near grain boundaries. The enhanced damping capacity at different frequencies was attributed to increased point defects and precipitates before 220°C, while microplastic internal friction dominated the damping mechanism in the later part of the test.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ali Ercetin, Oezguer Oezguen, Kubilay Aslantas, Oguzhan Der, Bekir Yalcin, Ercan Simsir, Muhammad Aamir
Summary: This research focuses on the fabrication and characterization of TAZ532-xNb composites. The composites were successfully formed by hot pressing using high-purity powders of Mg, Sn, Al, Zn, Mn, and Nb. XRD analysis confirmed the presence of desired phases in the composites. The composites exhibited high relative density, densely packed microstructure, and exceptional wetting characteristics. The mechanical properties, such as hardness and tensile strength, improved with increasing Nb reinforcement ratio.
Article
Materials Science, Multidisciplinary
Dongtao Wang, Shichao Liu, Xiaozu Zhang, Xinzhong Li, Haitao Zhang, Hiromi Nagaumi
Summary: The study found that low-temperature short-time artificial aging can significantly improve the mechanical properties of HPDC Al-Si-Cu-Mg-Zn alloy, and the as-cast microstructure of HPDC Al-Si-Cu-Mg-Mn-Zn alloy can be significantly refined. With the increase of aging temperature, better strengthening effect can be achieved.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Jian Rong, Wenlong Xiao, Yu Fu, Xinqing Zhao, Peng Yan, Chaoli Ma, Ming Chen, Chen Huang
Summary: A high-performance Mg-7Al-3Ca alloy was prepared via high-pressure die casting method, exhibiting high strength, good thermal conductivity, and acceptable heat resistance. The high strength was attributed to various strengthening mechanisms, while the thermal conductivity was maintained due to the presence of Ca.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Beibei Zhao, Bing Ye, Liyang Wang, Yang Bai, Xin Yu, Qigui Wang, Wenying Yang
Summary: The mechanical behavior and microstructure evolution of a newly developed high strength die casting Al-13Si0.25Cu alloy were investigated in different conditions, showing that ageing treatment can improve the yield strength while thermal exposure can result in reduced hardness and increased ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Jian Rong, Wenlong Xiao, Xinqing Zhao, Yu Fu, Haimiao Liao, Chaoli Ma, Ming Chen, Chen Huang
Summary: The study balanced high thermal conductivity and high strength in HPDC Mg alloys with Al addition. Results showed that Al addition improved thermal conductivity and electrical conductivity while enhancing strength and elongation of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
G. Anbuchezhiyan, B. Mohan, N. Senthilkumar, R. Pugazhenthi
Summary: In this study, aluminium metal matrix composite reinforced with hard silicon nitride (Si3N4) particles was experimentally synthesized using squeeze casting technique. The inclusion of Si3N4 significantly improved the mechanical behavior, corrosion resistance, and wear resistance of the synthesized composites, as observed through various tests. Scanning Electron microscope micrograph of worn surfaces revealed deep grooving associated with abrasive wear due to the presence of Si3N4.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Chengfa Ding, Zheng Ma, Shiwen Liu, Jinghua Zhao, Qun Luo, Hongliang Liu, Guangxin Wu, Jieyu Zhang
Summary: In this paper, a low-aluminum, low-magnesium Zn-Al-Mg alloy with high corrosion resistance is designed by CALPHAD method. The phase composition of the alloy is predicted and verified. It is found that the Mg2Zn11 phase in the alloy can improve corrosion resistance.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Bo Hu, Beibei Quan, Dejiang Li, Xueyang Wang, Zixin Li, Xiaoqin Zeng
Summary: The introduction of cerium promoted nucleation of alpha-Al grains and Al11Ce3 phase served as the heterogeneous nucleation substrate of alpha-Al due to small lattice mismatch. The lattice constant of alpha-Al increased with increasing Mg content, enhancing yield strength and hardness due to solid solution strengthening effect. Mg atom solid solution improved work hardening capacity by increasing work hardening exponent and reducing stacking fault energy, promoting dislocation tangles and networks in the alpha-Al matrix.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Shengwen Bai, Lintao Liu, Kun Li, Bin Jiang, Guangsheng Huang, Dingfei Zhang, Fusheng Pan
Summary: Laminated composite sheets of Mg alloys AZ31 and Mg-xGd were fabricated through co-extrusion, and their microstructure, tensile properties, and bendability were comparatively investigated. The results showed that the symmetric deformation of AZ31 and Mg-1.2Gd during co-extrusion resulted in a flat profile, uniform composite layers, and high bonding strength for the sheet AZ31/Mg-1.2Gd. The bendability of the laminated composite sheet AZ31/Mg-xGd was significantly improved compared to AZ31. By weakening the texture and activating non-basal slip in the composite layer containing the Gd element, the sheet AZ31/Mg-1.6Gd achieved the highest levels of ductility and bendability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Yihao Bao, Liang Chen, Jianwei Tang, Zhigang Li, Guoqun Zhao, Cunsheng Zhang
Summary: In this study, a Mg alloy with alloying elements of Zn, Al, Sn, and Mn was designed, and hot extrusion was carried out at various speeds and temperatures. It was found that high speed extrusion resulted in more second phase particles, while high extrusion temperature increased the number of second phases, grain size, and dynamic recrystallization degree. The sample extruded at a speed of 10 mm/min and temperature of 300 degrees C showed the highest yield strength, tensile strength, and corrosion resistance.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Caihong Hou, Zhisong Ye, Fugang Qi, Liwei Lu, Jia She, Lifei Wang, Xiaoping Ouyang, Nie Zhao, Jing Chen
Summary: The microstructure and mechanical properties of as-aged Mg-6Zn-4Sn-1Mn-xAl (ZTM641-xAl, x = 0, 0.2, 0.5, 1, 2, 3 and 4 wt.%) alloys were investigated. The addition of Al resulted in the formation of specific phases, while the grain size and undissolved phases were affected by the content of Al. The mechanical properties showed a decrease in strength and a non-monotonic trend in elongation with increasing Al content. The ZTM641-0.2Al alloy exhibited favorable mechanical properties at room temperature and 150 degrees C, with an elongation increase of about 45%.
Article
Metallurgy & Metallurgical Engineering
Zixin Li, Dejiang Li, Wenke Zhou, Bo Hu, Xingfeng Zhao, Jingya Wang, Ming Qin, Jiangkun Xu, Xiaoqin Zeng
Summary: The 3D visualization of porosity in high-pressure die casting (HPDC) Mg alloys revealed differences in pore distribution, formation mechanisms, and tensile failure prediction between alloy EA42 and AZ91D.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
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
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
Chemistry, Physical
Pengfei Yan, Tao Ying, Yangxin Li, Dejiang Li, Fuyong Cao, Xiaoqin Zeng, Wenjiang Ding
Summary: This paper investigates the use of a hydrophobic Polytetrafluoroethylene (PTFE)/Carbon cloth/Ag multilayer coating to enhance the corrosion resistance and electrical properties of magnesium alloy bipolar plates. The multilayer coating significantly reduces the corrosion current density of bare magnesium and improves the interfacial contact resistance between carbon paper and coated magnesium. Discussing the mechanism behind the superior corrosion resistance and electrical properties of coated magnesium may pave the way for the development of novel lightweight magnesium alloy PEMFC bipolar plates.
JOURNAL OF POWER SOURCES
(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
Nanoscience & Nanotechnology
Bo Hu, Beibei Quan, Dejiang Li, Xueyang Wang, Zixin Li, Xiaoqin Zeng
Summary: The introduction of cerium promoted nucleation of alpha-Al grains and Al11Ce3 phase served as the heterogeneous nucleation substrate of alpha-Al due to small lattice mismatch. The lattice constant of alpha-Al increased with increasing Mg content, enhancing yield strength and hardness due to solid solution strengthening effect. Mg atom solid solution improved work hardening capacity by increasing work hardening exponent and reducing stacking fault energy, promoting dislocation tangles and networks in the alpha-Al matrix.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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.
