Article
Chemistry, Physical
Wenjie Wang, Kaihuai Yang, Qianting Wang, Pinqiang Dai, Hui Fang, Fangjuan Wu, Qiaohang Guo, Peter K. Liaw, Nengbin Hua
Summary: In this study, TiZrHfNbFex refractory high-entropy alloys (HEAs) were developed and their microstructure, mechanical properties, corrosion resistance, and wear resistance were investigated. The TiZrHfNbFe0.5 alloy exhibited excellent overall mechanical properties and superior corrosion resistance. Additionally, the wear resistance of the alloy increased with the increase in Fe content.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Wei Wang, Shuhan Yuan, Junli Chen, Xuefeng Li, Zhaoyang Niu, Ran Wei, Tan Wang, Tao Zhang, Shaokang Guan, Fushan Li, Chen Chen
Summary: This paper systematically investigates the corrosion behavior and mechanism of CrFeCoNiNbx high entropy alloys (HEAs) with hypoeutectic and hypereutectic structures. It is found that both HEAs have a dual-phase structure of FCC + Lave. Similar corrosion behavior is observed during electrochemical polarization in 3.5 wt% NaCl solution at room temperature, and the hypereutectic HEA shows slightly higher corrosion resistance compared to the hypoeutectic one. Large proportions of Cr+Nb oxides are found in the passive films of these HEAs, with no significant difference in concentration, which is closely related to their high and similar corrosion resistance.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Wei Yang, Shu-Jie Pang, Guan Wang, Ying Liu, Peter K. Liaw, Tao Zhang
Summary: Ti-Zr-Hf-Nb-Ta-Sn high-entropy alloys with good mechanical properties, corrosion resistance, and biocompatibility were developed as potential biomaterials. The addition of Sn improved the compressive yield strengths and hardness of the alloys. These alloys also possessed relatively low Young's moduli. The Ti-Zr-Hf-Nb-Ta-Sn alloys with the integration of high yield strength, relatively low Young's modulus, and good corrosion resistance and biocompatibility are promising for biomedical applications.
Article
Chemistry, Physical
Wei Yang, Shujie Pang, Ying Liu, Qing Wang, Peter K. Liaw, Tao Zhang
Summary: Novel high-entropy alloys (HEAs) with excellent mechanical properties and biocompatibility have been designed and synthesized for biomedical applications, demonstrating great potential in the field.
Article
Materials Science, Multidisciplinary
Xuefeng Li, Guangzeng Zhang, Nuo Lei, Ran Wei, Tan Wang, Tao Zhang, Shaojie Wu, Shaokang Guan, Fushan Li, Chen Chen
Summary: The corrosion resistance and mechanisms of CrFeNiNbx (x = 0.2, 0.4) hypoeutectic and hypereutectic medium entropy alloys (MEAs) in 3.5 wt% NaCl solution were investigated. Both MEAs showed excellent and similar corrosion resistance due to the presence of ultrahigh oxidized (Cr, Nb) concentration in their passive films. However, significant differences in corrosion behaviors were observed between the FCC and Laves phases in these alloys, possibly influenced by their diverse chemical properties and formation of passive films. This study provides valuable insights for designing high-performance eutectic-related MEAs with exceptional corrosion resistance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
Chuanqiang Li, Yibin He, Huaipei Huang
Summary: In this study, the microstructure, crystallographic texture, mechanical properties, and corrosion resistance of as-extruded HCP Mg-xLi (x = 1, 3, 5; in wt%) alloys were investigated. The results showed that the Mg-5Li alloy with high lithium content exhibited a low degree of dynamic recrystallization and strong prismatic texture, leading to higher mechanical strength along the extrusion direction. Additionally, the high lithium content improved the corrosion resistance of the alloy and mitigated groove-like corrosion.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Chemistry, Physical
Chang Liu, Yu Gao, Kai Chong, Fuqiang Guo, Dongting Wu, Yong Zou
Summary: This paper investigates the microstructure and corrosion resistance of FeCoCrNiNbx high-entropy alloys in a chloride ion environment. The results show that FeCoCrNiNb0.15 alloy exhibits the best corrosion resistance, with significantly lower corrosion current density and corrosion rate compared to 316LSS. The P-N junction improves the corrosion resistance of the passive film of FeCoCrNiNb0.15, while the passive film of FeCoCrNi mainly exhibits n-type semiconductor characteristics.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Qifeng Zheng, Weiyan Lu, Dong Han, Tianrun Li, Hui Guo, Keqiang Qiu, Baijun Yang, Jianqiang Wang
Summary: This study investigates the influence of Al element addition on the microstructure, mechanical properties, and corrosion resistance of high-entropy alloys (HEAs). The results show that the addition of Al significantly improves the strength and plasticity of the alloys but is harmful to their corrosion resistance. Nevertheless, all HEAs exhibit superior corrosion resistance compared to 304 stainless steel.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Meichen Hu, Li Wang, Gen Li, Qianli Huang, Yang Liu, Junyang He, Hong Wu, Min Song
Summary: This study investigates the potential of three medium entropy alloys (MEAs) as biomedical materials. The alloys exhibit a dendrite microstructure, which can be reduced through homogenization treatment. The MEAs show good compressive ductility and yield strength, as well as excellent corrosion resistance and cyto-compatibility. The Ti-Nb-Zr MEAs have promising potential in biomedical applications.
Article
Materials Science, Multidisciplinary
Zening Wang, Yu Yan, Yuan Wu, Xin Huang, Yi Zhang, Yanjing Su, Lijie Qiao
Summary: Equiatomic TiZr(Hf, Ta, Nb) medium entropy alloys (MEAs) were developed to enhance corrosion resistance compared to pure Ti. Nb and Ta alloying can improve the corrosion resistance by reducing defects in passive films. The thickness of oxide films on TiZr(Hf, Ta, Nb) alloys increases in the order of Hf > Zr > Ti > Nb > Ta, indicating the ability of elements to form oxides. TiZrNb alloy exhibits higher tribocorrosion rate due to severe ploughing and delamination wear.
Article
Materials Science, Multidisciplinary
Jie-Yi Yao, Leandro Bernardes Serrano, Sydney Ferreira Santos, Katia Regina Cardoso
Summary: Novel high-entropy alloys (HEAs) of the Ti(30-x)VCrNb(x) (x = 0, 5, 10, 15, and 20 at%) system were designed, synthesized, and characterized. The microstructural features were investigated by XRD, SEM, and EDS. The corrosion behavior was evaluated in 3.5 wt% sodium chloride (NaCl) solution of pH 5 at 25 degrees C by potentiody-namic polarization and electrochemical impedance spectroscopy (EIS). The investigated HEAs exhibited a single-phase BCC solid solution with dendritic microstructures. The polarization curves showed the Ti10V35Cr35Nb20 (Nb20) HEA exhibited the best corrosion resistance with the lowest corrosion current density (2.24 mu A/cm2) and corrosion rate (1.15 x 10-2 mm/yr). The interpretation of an equivalent electric circuit (EEC) suggested the formation of a stable passive oxide film on the HEAs, as indicated by good capacitive behavior and high impedance values (>104 omega cm2) at low frequencies and phase angles close to -80 degrees. This study demonstrated that an appropriate Nb content can stabilize the BCC phase and significantly enhance the corrosion resistance of the HEAs.
Article
Materials Science, Multidisciplinary
Junshuai Wang, Wenlong Xiao, Lei Ren, Yu Fu, Chaoli Ma
Summary: Oxygen content plays a significant role in the performance of Ti-Nb based alloys, affecting the balance between strength and ductility through controlling oxygen and Nb content. By doping a certain amount of oxygen, the alloy can achieve simultaneous improvement in strength and ductility.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Jian Wu, Heguo Zhu, Zonghan Xie
Summary: Designing strong, yet ductile, and body-centered cubic (BCC) medium-entropy alloys (MEAs) remains a challenge. This study tackled the strength-ductility trade-off by introducing a BCC + face-centered cubic (FCC) dual-phase microstructure. Ni0.6CoFe1.4Nbx MEAs were prepared, and results showed that the new alloy consisted of BCC plus FCC dual phases with a network-like structure. The Nb0.10 MEA exhibited high strength and respectable tensile ductility, making it the best combination among the alloys studied.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yuhao Jia, Zhijun Wang, Qingfeng Wu, Feng He, Junjie Li, Jincheng Wang
Summary: It is still a challenge to increase the yield strength of eutectic high-entropy alloys. By modifying the Ni: Co ratio to introduce the gamma ' phase, a series of casting hypoeutectic high-entropy alloys with improved yield strength and ductility were developed. The results provide a feasible route for developing high-performance Ni-Co-Cr-Fe-Al casting HEAs with multiscale microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Hao Wu, Jun Xie, Huai-Yu Yang, De-Long Shu, Gui-Chen Hou, Jin-Guo Li, Yi-Zhou Zhou, Xiao-Feng Sun
Summary: This paper systematically studied the mechanical and corrosion behaviors of AlCrFeNi3.1 and AlCrFe2Ni2.1 HEAs, and compared the results with AlCoCrFeNi2.1 EHEA. The results showed excellent strength and ductility in these HEAs, indicating the feasibility of substituting cobalt element and AlCrFeNi3.1 HEA exhibited the best corrosion resistance.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)