Article
Materials Science, Multidisciplinary
Huilong Zhong, Shengci Li, Zhiqian Zhang, Dehua Li, Hongling Deng, Jiqiang Chen, Liang Qi, Olanrewaju A. Ojo
Summary: This study evaluated the effects of rare earth elements (Er, Pr) on the microstructure, mechanical properties, and corrosion resistance of 7055 alloys. It was found that the addition of rare earth elements reduced the number of residual phases and increased the proportion of low angle grain boundaries (LAGBs). The 7055 alloy with Pr had the lowest number of residual phases, while the 7055 alloy with Pr and Er had the highest proportion of LAGBs. Compared to the untreated 7055 alloy, the alloys with rare earth elements exhibited improved elongation and corrosion resistance.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Mingdong Wu, Daihong Xiao, Xinkai Wang, Lanping Huang, Wensheng Liu
Summary: The effects of Zn contents on the mechanical properties, corrosion behaviors, and microstructural evolution of extruded Al-Li-Cu-Mg-Ag alloys were investigated. Increasing Zn contents can accelerate hardening kinetics, improve hardness, and enhance corrosion resistance. The addition of 0.57 wt.% Zn to the alloy showed the best combination of tensile strength and corrosion resistance.
Article
Materials Science, Multidisciplinary
Shunuo Bian, Lihua Yu, Pei Jia, Junhua Xu
Summary: NbCN-Cu composite films with different Cu contents were prepared using multi-target confocal RF magnetron sputtering, and were characterized and analyzed using various techniques. The films exhibited a complex microstructure and showed high hardness and excellent corrosion resistance.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Jia Liu, Xuguang An, Jing Zhang, Qingquan Kong, Qiangguo Li, Hui Wang, Weitang Yao, Qingyuan Wang
Summary: The effects of Al/Mo content on phase, microstructure, mechanical and corrosion properties of AlxCrFeNi2.5Mo1-x high-entropy alloys were investigated. With the increase of Al content, the alloy phases evolved from FCC + sigma phase to FCC + BCC + sigma phase and finally to FCC + BCC phase, and the microstructure transformed from hypoeutectic to hypereutectic. Among all the alloys, Al1.0CrFeNi2.5 alloy exhibited excellent comprehensive mechanical properties. Additionally, Mo element improved the pitting corrosion resistance but promoted the formation of sigma phase, leading to an uneven distribution of Cr elements and reduced resistance to localized corrosion.
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
Materials Science, Multidisciplinary
Xianxian Ding, Yalin Lu, Jian Wang, Xingcheng Li, Dongshuai Zhou
Summary: The effects of Ce content on the microstructures and mechanical properties of Al-Cu-Li alloys were investigated. Ce addition can refine the grains of Al-Cu-Li alloy. The presence of Al8Cu4Ce phases on the grain boundary inhibits the recrystallization of the alloy after T6 treatment. This work provides an economical and convenient method for improving the properties of Al-Cu-Li alloys by Ce addition.
Article
Chemistry, Physical
Liang Chen, Yuzhu Hou, Zhigang Li, Guoqun Zhao, Cunsheng Zhang
Summary: The balance between mechanical properties and corrosion resistance is crucial for high strength 7xxx Al alloys. This study investigated the effects of pre-rolling, solution treatment, and aging treatment on a recently developed 7A99 Al alloy. The results showed that cold rolling after solution treatment led to finer grain structure, while cold rolling before solution treatment accelerated the coarsening of precipitates. T76 aging treatment resulted in larger precipitate size compared to T6 aging treatment. Pitting corrosion primarily occurred at intermetallic compounds, while intergranular corrosion was facilitated by the dissolution of MgZn2 phase along grain boundaries. Cold rolling after solution treatment and T76 treatment improved stress corrosion cracking resistance, while cold rolling before solution treatment and T6 treatment enhanced the strength. The proposed method of T76 treatment showed only a slight reduction in strength compared to T6 treatment, indicating its advantage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Stanislav O. Rogachev, Evgeniya A. Naumova, Eva A. Lukina, Adrian Zavodov, Vladimir M. Khatkevich
Summary: A comparative analysis was conducted on the microstructure and tensile properties of binary eutectic aluminum alloys Al-10% La, Al-9% Ce, and Al-7% Ni under high-pressure torsion (HPT). The refinement of eutectic particles in aluminum alloys through HPT resulted in a significant increase in strength while maintaining high plasticity. This study has established the relationship between the type of eutectic particles, structure formation process, and mechanical properties of the aluminum alloys.
Article
Chemistry, Physical
Zhe Wang, Binguo Fu, Yufeng Wang, Tianshun Dong, Jingkun Li, Guolu Li, Xuebo Zhao, Jinhai Liu, Guixian Zhang
Summary: Ti-Cu alloys have excellent properties for biomedical applications. This study investigated the effect of copper content on the precipitation behaviors, mechanical properties, and corrosion resistance of as-cast Ti-Cu alloys. The results showed that an increase in copper content led to an increase in the volume fraction of Ti2Cu phase, resulting in improved mechanical properties and corrosion resistance.
Article
Materials Science, Multidisciplinary
Yu-Cai Wu, Xi -Chun Zhong, Yuan-Xin Li, Xuan Huang, Jiao-Hong Huang, Cui-Lan Liu, Zhong-Wu Liu, Wan-Qi Qiu, Ming -Long Zhong, Zhen-Chen Zhong, R. V. Ramanujan
Summary: LaFe11.8Si1.2/16wt%La65Co35 samples were prepared by spark plasma sintering (SPS) and subsequent annealing. The La65Co35 binder increased the 1:13 phase content, and the alpha-Fe phase formed and disappeared during annealing. The sample annealed for 0.5 h showed a distinct core-shell structure, desirable table-like (-Delta S-M) -T curve, and higher RC value. The diffusion of Co was hindered by the growth of La5Si3 phase. Samples annealed for 24 h achieved larger (-Delta S-M)(max) and (sigma(bc))(max) values. The method combining SPS and diffusion annealing is promising for preparing La-Fe-Si based magnetocaloric composites with good properties.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Tao Liu, Qing Dong, Yanan Fu, Jian Yang, Jiao Zhang, Baode Sun
Summary: The effect of La-Ce addition on the solidification behavior of hypoeutectic Al-Cu alloy was investigated. It was found that La-Ce addition can decrease the nucleation density and result in coarser grains at lower cooling rates, while at higher cooling rates, it can increase melt undercooling and lead to grain refinement.
Article
Chemistry, Physical
Te Niu, Hongyang Li, Yuhang Wei, Zhanming Zhou, Ying Liu
Summary: A new multi-principal Al-Co-Ni-Cu alloy with high damping and good corrosion resistance was prepared. The effects of the Al content on the microstructure, damping properties, corrosion behavior, and mechanical properties of AlxCoNi2Cu (x = 0, 0.1, 0.3, and 0.5) alloys were studied. The Al0.5CoNi2Cu alloy exhibited a significant increase in internal friction and lower corrosion rate, demonstrating promising damping and corrosion resistance properties for marine applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Chengwe Ji, Aibin Ma, Jinghua Jiang
Summary: In this study, novel low-cost lightweight high entropy alloys Al35Mg30-xZn30Cu5Six (x = 5, 10, 15) were designed and prepared. The microstructures, mechanical properties, and corrosion behavior of the alloys were investigated, showing that the alloys have complex phase structures but exhibit good compressive strength. With the increase of Si/Mg ratio, the alloys' mechanical properties and corrosion resistance improved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Chao Sun, Huan Liu, Ce Wang, Jia Ju, Guowei Wang, Jinghua Jiang, Aibin Ma, Jing Bai, Feng Xue, Yunchang Xin
Summary: This study investigated the anisotropy of a 32-pass ECAP processed Mg-3.7Al-1.8Ca-0.4Mn alloy, which exhibited synergistically enhanced mechanical properties and corrosion resistance. The ECAP alloy had homogeneous fine alpha-Mg grains and different distribution of refined Al2Ca particles. The refinement of microstructure resulted in the formation of a protective film on the ECAP alloy, leading to different corrosion mechanisms compared to the as-cast alloy. The distribution of Al2Ca and the texture of alpha-Mg were identified as the main factors affecting the anisotropic properties of the ECAP alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Jingkun Zhu, Dongyan Ding, Wenlong Zhang, Yongjin Gao, Zhanlin Wu, Guozhen Chen, Renzong Chen, Yuanwei Huang, Jinsong Tang
Summary: La alloying can improve the microstructure, mechanical properties, and electrochemical performance of Al-Fe-Mn alloys. However, an excessive La content may lead to uneven distribution of precipitates, reducing the alloy's performance.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Applied
Jiayi He, Yukun Liu, Zhigao Yu, Jiali Cao, Hongya Yu, Zhongwu Liu
Summary: Grain boundary diffusion (GBD) is an important method for producing Nd-Fe-B magnets with high coercivity and thermal stability. This study investigated the effects of different GBD methods on the magnetic properties and microstructure of hot deformed magnets. The coercivity of the hot-deformed magnet increased after treatment by the three GBD approaches. The conventional GBD exhibited a higher utilization efficiency of Tb compared to in-situ GBD.
JOURNAL OF RARE EARTHS
(2023)
Article
Chemistry, Applied
Bang Zhou, Yitong Liu, Songmao Li, Wenbing Fan, Xuefeng Liao, Jiayi He, Hongya Yu, Zhongwu Liu
Summary: This work investigated the magnetic properties and phase precipitation behavior of Gd2Fe14B alloys in order to utilize gadolinium (Gd) in the development and manufacturing of RE-permanent magnets. The optimal direct quenched nanocrystalline Gd2Fe14B alloy exhibited excellent magnetic properties, thermal stability, and performance stability under various processes. Gd substitution in (Y1exGdx)2Fe14B alloys significantly enhanced thermal stability and decreased irreversible remanence loss, while also improving the exchange coupling effect, corrosion resistance, and oxidation resistance. This study has important implications for designing and developing low-cost RE permanent magnets with improved thermal and environment stability.
JOURNAL OF RARE EARTHS
(2023)
Article
Materials Science, Multidisciplinary
Ke Xu, Weida Huang, Xuefeng Liao, Hongya Yu, Xichun Zhong, Zhongwu Liu
Summary: In this study, a new one-step hot deformation (HD) process was proposed for fabricating NdFeB magnets using amorphous powders. The effects of deformation ratio on the microstructure, magnetic properties, and corrosion resistance were investigated. The results showed that one-step HD process can significantly improve the properties of NdFeB magnets, and the Co element segregation has important effects on the temperature and thermal stability of the magnets.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Yixuan Han, Mukun He, Jinwen Hu, Panbo Liu, Zhongwu Liu, Zhonglei Ma, Wenbo Ju, Junwei Gu
Summary: This study successfully synthesized a magnetic microwave absorbing material (MAMs) using a hydrothermal method, and its composition and morphology were controlled by adjusting the atomic ratio. The MAMs showed enhanced microwave absorption in the C band, making it a potential solution for electromagnetic pollution in this frequency range.
Article
Materials Science, Multidisciplinary
Jinwen Hu, Sichen Liu, Yi Wang, Wenbo Ju, Na He, Jiayi He, Haoyang Jia, Chenbin Xia, Zhengsheng Huang, Jin Long, Xichun Zhong, Zhongwu Liu
Summary: In this study, flaky FeSiAl (FSA) powders were coated with an insulation layer by manganese phosphating treatment to improve the microwave absorption properties. The optimally Mn3(PO4)2 coated FSA showed excellent anti-corrosion performance with a much slower corrosion rate compared to the naked FSA particles. This work provides a low-cost phosphating process for manufacturing corrosion-resistant microwave absorbers in the widely-used X frequency band.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Pan Luo, Hongya Yu, Ce Wang, Han Yuan, Zhongwu Liu, Yu Wang, Lu Yang, Wenjie Wu
Summary: Core-shell structured amorphous FeSiBCr@phosphate/silica powders were prepared by phosphating and sodium silicate treatment, and soft magnetic composites (SMCs) were fabricated based on these powders. The properties of the powders and composites were investigated by varying phosphoric acid (H3PO4) concentration and annealing temperature. Optimum results were achieved with 0.5 wt.% H3PO4 concentration and annealing at 773 K, leading to a complete and uniform SiO2 layer formation, a double layer core-shell structure, and excellent soft magnetic properties.
Article
Materials Science, Multidisciplinary
Qintian Xie, Hongya Yu, Han Yuan, Guangze Han, Xi Chen, Zhongwu Liu
Summary: FeSiCr soft magnetic composites (SMCs) were prepared by the sol-gel method with an Al2O3/resin composite layer as the insulation coating. The Al2O3 insulation coating improved the core loss, resistivity, quality factor, and thermal conductivity of SMCs. This study provides valuable references for the design and fabrication of SMCs in high-temperature and high-frequency environments.
Article
Materials Science, Multidisciplinary
Bang Zhou, Weisen Huang, Wenbing Fan, Hongrui Zhang, Hongya Yu, Kewen Long, Zhongwu Liu
Summary: The microstructure, magnetic properties, corrosion and aging resistance, and mechanical properties of Nd-Fe-B, (Nd, La, Ce)-Fe-B, and (Ce, La, Y)-Fe-B rubber magnets were investigated. The study found that increasing the filling ratio and particle size improves the magnetic properties and tensile strength. The full high-abundance (Ce, La, Y)-Fe-B rubber magnet showed competitive advantage in performance stability.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Xiangyi Liu, Jiayi He, Bin Yuan, Zhongwu Liu
Summary: Grain boundary diffusion (GBD) is an effective method to fabricate high-coercive Nd-Fe-B magnets with less consumption of heavy rare earth (HRE). However, the recently observed anti-core-shell structure in HRE diffused magnets after over-saturated diffusion reduces the beneficial effect of HRE GBD on the coercivity by accelerating the magnetization reversal of the whole magnet. Therefore, it is important to avoid the formation of anti-core-shell structure during diffusion and select appropriate diffusion time and diffusion source dosage for GBD process to obtain high-performance products and efficiently use the HRE resources.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Chunlong Li, Hongya Yu, Guangze Han, Zhongwu Liu
Summary: In this work, FeSiCr powders were coated with a SiO2 insulation layer for soft magnetic composites (SMCs) through the hydrolysis of elemental silicon powder. The study investigated the effects of reaction temperature and ammonia concentration on the structure and performance of SMCs. The hydrolysis process effectively reduced core loss, increased resistivity, and improved the quality factor of SMCs.
Article
Materials Science, Multidisciplinary
Zhongwu Liu
Article
Physics, Applied
Bang Zhou, Wei Li, Lin Wen, Chengyuan Xu, Xuefeng Liao, Jinbo Wei, Yu Pan, Xiaolian Liu, Song Fu, Lizhong Zhao, Hongya Yu, Xichun Zhong, Xuefeng Zhang, Zhongwu Liu
Summary: This study introduces the non-rare earth element Ge into Ce, La, and Y-based RE-Fe-B nanocrystalline alloys, successfully enhancing their magnetic properties. The (BH)(max) of 65.6 kJ/m(3) and H-cj of 346 kA/m are achieved in the [(Ce0.8La0.2)(0.5)Y-0.5](16)Fe77.5B6Ge0.5 alloy. The improvement is attributed to the increased content of the hard magnetic RE2Fe14B phase with refined grain size, which is confirmed by micromagnetic simulation. Ge addition effectively suppresses the laves phase by forming the Ce5Ge3 phase with the lowest formation energy. This work clarifies the positive role of Ge in enhancing the H-ci and (BH)(max) of nanostructured (Ce,La,Y)-Fe-B alloys.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Wenbing Fan, Bang Zhou, Jiayi He, Xuefeng Liao, Yaxiang Wu, Hongya Yu, Jiangxiong Wei, Zhongwu Liu
Summary: To inhibit the magnetic dilution effect of Ce in Nd-Ce-Fe-B magnets, a dual-alloy method is employed to prepare hot-deformed dual-main-phase (DMP) magnets using mixed nanocrystalline Nd-Fe-B and Ce-Fe-B powders. The lattice parameters of the RE2Fe14B (2 : 14 : 1) phase exhibit non-linear variation with the increasing Ce-Fe-B content due to the mixed valence states of Ce ions. The magnetic properties of DMP Nd-Ce-Fe-B magnets almost decrease with the increase of Ce-Fe-B addition, but the magnet with 10 wt% Ce-Fe-B addition exhibits improved intrinsic coercivity and temperature coefficients of remanence and coercivity compared to the single-main-phase Nd-Fe-B magnet.
Article
Materials Science, Multidisciplinary
Xuefeng Liao, Junwei Zheng, Zhiyu Liu, Weiwei Zeng, Cifu Lu, Renheng Tang, Qing Zhou
Summary: This study compares the effects of Cu element on nanocrystalline magnets and finds that Cu can significantly enhance the coercivity and remanence of the magnets, as well as improve grain alignment and hot-deformation processing.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
