Article
Nanoscience & Nanotechnology
Shuanglei Li, Jin-Hwan Lim, Izaz Ur Rehman, Won-Tae Lee, Jung Gi Kim, Jeong Seok Oh, Taekyung Lee, Tae-Hyun Nam
Summary: In this study, Ti-20Zr-(8-12)Nb-3Sn shape memory alloys were fabricated and their phase constitutions, texture characteristics and superelastic behaviors were investigated. It was found that the texture characteristics of the alloys can be tuned by varying Nb content, and the presence of Nb enhances the stability of the beta phase. The Ti-20Zr-(11, 12)Nb-3Sn specimens exhibited superior superelasticity, and the simultaneous presence of beneficial texture and superelasticity in the Ti-20Zr-11Nb-3Sn specimen is advantageous for biomedical applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Alexandra Baranova, Sergey Dubinskiy, Natalia Tabachkova, Sergey Prokoshkin, Vladimir Brailovski
Summary: The dependence of isothermal omega(iso)-phase formation on heating, holding, and cooling conditions during the ageing of Ti-Nb-Zr shape memory alloys is insufficiently understood. This study investigates the crystal structure and morphology of the omega(is)(o)-phase in a thermomechanically treated Ti-22Nb-6Zr (at%) alloy during ageing under different temperature conditions using X-ray diffraction and transmission electron microscopy. The results show that the beta -> omega(iso) transformation exhibits C-shaped kinetics with a maximum at 300 degrees C, and the formation and growth of the omega-phase are mainly controlled by shear-related mechanisms and to a lesser extent, diffusion-related mechanisms.
Article
Chemistry, Physical
Shuanglei Li, Xu Wang, Yeon-Wook Kim, Jong-Taek Yeom, Tae-Hyun Nam
Summary: In this study, biomedical Ti-Zr-Nb-Sn highly porous shape memory alloys (HPSMAs) with unique superelasticity and high porosity were prepared for the potential repair of cancellous bone defects. The HPSMAs showed mechanical performances similar to cancellous bone and stable superelastic behaviors after cycle training. This research demonstrates the great potential of Ti-Zr-Nb-Sn HPSMAs in the repair of cancellous bone defects.
Article
Materials Science, Multidisciplinary
Ruzil Farrakhov, Olga Melnichuk, Evgeny Parfenov, Veta Mukaeva, Arseniy Raab, Vadim Sheremetyev, Yulia Zhukova, Sergey Prokoshkin
Summary: The study compares plasma electrolytic oxidation (PEO) coatings on commercially pure titanium and a novel superelastic alloy Ti-18Zr-15Nb (at. %) for implant applications. Results show that the PEO coating on Ti-18Zr-15Nb alloy exhibits higher thickness, porosity, and roughness compared to the coating on commercially pure titanium, providing better corrosion protection.
Article
Materials Science, Multidisciplinary
C. Lauhoff, V. Remich, M. F. Giordana, C. Sobrero, T. Niendorf, P. Krooss
Summary: In this study, the superelastic properties of a newly introduced Fe-Ni-Co-Al-Ti-Nb shape memory alloy are investigated. It is found that the <001>-oriented single-crystalline material in aged condition (650 degrees/6 h) exhibits excellent superelasticity at -130 degrees with fully reversible strains up to about 6%. However, the alloy system shows limited functional stability under cycling loading at different test temperatures.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Kaito Nakabachi, Ken'ichi Yokoyama
Summary: The addition of a small amount of H2O2 effectively reduces hydrogen absorption caused by wear in Ni-Ti superelastic alloys in 0.15 M NaCl solution.
Article
Chemistry, Physical
V. Sheremetyev, K. Lukashevich, A. Kreitcberg, A. Kudryashova, M. Tsaturyants, S. Galkin, V. Andreev, S. Prokoshkin, V. Brailovski
Summary: In this study, Ti-19Zr-14 Nb shape memory alloy was used to fabricate long-length bar stock for load-bearing orthopedic implants through low- and high-temperature thermomechanical treatments. The phase composition, structure, texture, mechanical properties, and fatigue behavior of the alloy were investigated under different treatment conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
N. L. Church, C. E. P. Talbot, J. R. Miller, L. D. Connor, S. Michalik, N. G. Jones
Summary: Significant variations in martensite start temperature (Ms) have been observed in the literature for samples of identical composition, but the factors affecting Ms remain unclear, limiting industrial applications. Claims that the isothermal variant of the ω phase (ωiso) may drive changes in Ms have been questioned due to the absence of distinct ωiso following thermal cycling. In this study, synchrotron X-ray diffraction confirmed that dramatic changes in Ms can occur without ωiso formation, suggesting an alternative mechanism based on the total stress model. This improved understanding can resolve discrepancies in the literature and enhance industrial uptake of these materials.
Article
Materials Science, Multidisciplinary
Xiaoyang Yi, Yunfei Wang, Wei Liu, Bin Sun, Bowen Huang, Xianglong Meng, Zhiyong Gao, Haizhen Wang
Summary: This study systematically investigated the effects of Co addition on the microstructural evolution and mechanical properties of Ti-Nb based shape memory alloys. The results showed that Co addition can alter the phase constituents by changing the average bond length and average d orbital energy level. The volume fraction of α' martensite phase increased with the addition of 2.0 at.% Co, while the yield strength and maximum tensile strength increased with Co content up to 3.0 at.%. However, the alloy containing 5.0 at.% Co exhibited a reduction in yield strength and maximum tensile strength due to the formation of metastable β parent phase.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Danil Barilyuk, Andrey Bazlov, Natalia Arkharova, Tatyana Teplyakova, Anton Konopatsky, Sergey Prokoshkin
Summary: Four novel superelastic alloys, Ti-41Zr-12Nb, Ti-42Zr-11Nb, Ti-43Zr-10Nb, Ti-44Zr-10Nb, were obtained and studied for their microstructure and mechanical properties, showing pronounced superelastic behavior after thermomechanical treatment. Among them, Ti-41Zr-12Nb demonstrated the highest ductility and is considered one of the most promising alloys in the Ti-Zr-Nb system.
Article
Materials Science, Multidisciplinary
Jessica Dornelas Silva, Gisele Fernandes Chaves Macieira, Dilson Silva dos Santos, Leandro de Arruda Santos, Vicente Tadeu Lopes Buono
Summary: Ti52-xNi38Cu10Nbx alloys with Nb additions were produced and their phase constitution and morphology were investigated. The study demonstrated the importance of metastable phases and Nb content in the solidification sequence, phase distribution, and morphology of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Jeongsoo Kim, Yongjoo Kim, Wontae Kim, Dohyang Kim
Summary: This study investigates the use of (Ni0.35Ti0.30Cu0.15Zr0.20)(100-x)Si-x (x = 0, 0.5, 1.0, 2.0 at%) alloy as a metallic glass precursor for a superelastic alloy, finding that the addition of Si improves glass forming ability and stabilizes the supercooled liquid. The fabrication of millimetre-scale Ni-Ti-Cu-Zr-Si metallic glass was achieved by hot pressing overlapped as-cast plates, with parameters relevant to superelastic effects remaining almost constant.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
J. F. Gomez-Cortes, V. Fuster, M. Perez-Cerrato, P. Lorenzo, I. Ruiz-Larrea, T. Breczewski, M. L. No, J. M. San Juan
Summary: This study compared the damping capacity of four copper-based SMAs, demonstrating that all four alloys possess intrinsic superelastic damping capacity and offer a wide range of loss factors. Additionally, a size effect on damping at the nanoscale was observed in the Cu-Al-Ni-Ga alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
J. N. Lemke, F. Gallino, M. Cresci, A. Coda
Summary: The addition of Nb to Ni-Ti-Hf alloys increases their ductility without significantly affecting functional performance, due to the formation of eutectic constituents composed of soft beta-Nb and B19' Ni-Ti-Hf matrix phase. Crucial for designing high performing Ni-Ti-Hf-Nb alloys is considering consequences of the low solubility of Nb in the matrix and the varying solubility of elements in beta-Nb on the transformation temperatures. A case study on a drawn Ni-Ti-Hf-Nb wire demonstrates that improved mechanical properties and high transformation temperatures can be achieved by this approach, increasing the possibility for wire drawing of high temperature shape memory alloys.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Kaito Nakabachi, Ken'ichi Yokoyama
Summary: Hydrogen absorption behavior was investigated during wear between Ni-Ti superelastic alloys in purified water. The study found that the amount of absorbed hydrogen increased with increasing wear time. Additionally, residual martensite phase and hydride were observed after the wear test.
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)