Article
Engineering, Manufacturing
E. Sallica-Leva, J. B. Fogagnolo, R. B. Falca, J. B. Ferreira Neto, C. T. Dos Santos, D. L. Bayerlein, F. J. G. Landgraf
Summary: TNZ parts with desired properties can be obtained by selecting appropriate laser processing parameters, which affect the microstructure and trace element content depending on the ED applied.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Nanoscience & Nanotechnology
R. D. Jones, A. J. Knowles, W. J. Clegg
Summary: This study investigates the precipitation of TiFe in a binary titanium-iron system, showing that Fe supersaturation promotes TiFe precipitation but leads to a decrease in alloy hardness as TiFe volume fraction increases. The change in hardness is influenced by multiple mechanisms, including Fe solid solution strengthening, omega precipitation strengthening, and softening caused by the precipitation of softer TiFe and alpha-Ti phases from the harder omega-strengthened beta-Ti parent phase.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Fengxiang Zhang, Lijing Zheng, Fangfang Wang, Hu Zhang
Summary: The microstructural and mechanical properties of Ni55Ti45 alloy and Hf-modified Ni55Ti45-xHfx alloys were studied. Hf addition suppressed certain phases and promoted the formation of HfO2 particles. The alloy with 3% Hf content exhibited the best combination of fracture toughness and tensile strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Yali Xu, Binbin Zhang
Summary: Hydrogen has a significant impact on the mechanical properties and deformation behavior of near-alpha alloy Ti-6Al-3Nb-2Zr-1Mo, enhancing strength and plasticity while affecting impact toughness differently at varying hydrogen content levels. Hydrogen inhibits twinning, enhances dislocation slip, and alters deformation behavior by activating basal and pyramidal slip and suppressing prismatic slip.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Mojtaba Najafizadeh, Ashkan Bahadoran, Mansoor Bozorg, Behzad Sadeghi, Jiamiao Liang, Deliang Zhang
Summary: The study found that the Al content and heat treatment significantly affected the microstructures and mechanical properties of Ti-XAl-2Fe-3Cu alloys. Increasing Al content reduced the average lamellar colony size and thickness of the alloy, while heat treatment increased lamellar thickness and partitioning of Fe and Cu. Increasing Al content slightly increased the strength without changing ductility, while heat treatment slightly reduced strength but increased tensile ductility of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
C. Aguilar, F. San Martin, C. Martinez, B. Camara, F. Claverias, A. Undabarrena, M. Sancy, V. Salinas, L. Munoz
Summary: This study investigates the potential of Ti-Ta-Sn alloys for biomedical applications due to their excellent mechanical properties and biocompatibility, with a particular focus on their use in trabecular bone replacement. The influence of Sn on the mechanical properties and antibacterial response of Ti-13Ta-xSn (x:3, 6, 9, and 12 at.%) alloy foams was analyzed. The Ti-based alloy foams showed no antibacterial activity nor bacterial adhesion, indicating that there is bacterial adhesion inhibition.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Luis Umbelino dos Santos, Kaio Niitsu Campo, Rubens Caram, Eder Socrates Najar Lopes
Summary: In this study, the influence of oxygen content on the microstructure and mechanical properties of Ti-Nb alloys was evaluated. The results showed that increasing oxygen content slightly affected the thickness of alpha plates and beta-transus, but improved hardness and compressive yield stress. Solid-solution strengthening by Nb and oxygen, along with microstructural refinement by Nb addition, were responsible for these improvements.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
H. M. Gardner, P. Gopon, C. M. Magazzeni, A. Radecka, K. Fox, D. Rugg, J. Wade, D. E. J. Armstrong, M. P. Moody, P. A. J. Bagot
Summary: This study investigates the degradation of mechanical properties of titanium alloys in the aerospace industry under oxygen ingress. Different effects of microstructure and crystallography on hardness at various oxygen concentrations were explored using advanced analysis methods. Oxygen ingress along potential alpha/beta interfaces was directly observed on the nanoscale, indicating the dominance of interstitial solid solution hardening at higher oxygen concentrations.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Fangli Zhang, Linjiang Chai, Lan Qi, Yueyuan Wang, Lu Wu, Hucheng Pan, Changqing Teng, Korukonda L. Murty
Summary: Two typical Zr alloys (Zr-4 and N36) used for nuclear applications were modified using laser surface remelting (LSR). The LSR led to the formation of two distinct zones in the alloys: a remelting zone (RZ) and a heat affected zone (HAZ). The RZ showed enhanced surface hardness and improved wear resistance compared to the substrates. Analysis revealed that refined grains, solid solution, and internal nano-twins contributed to the improved properties in the LSRed Zr alloys.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Chemistry, Physical
Shimaa El-Hadad, Ayman Elsayed, Bin Shi, Helmi Attia
Summary: In this study, Ti-6Al-4V and Ti-6Al-7Nb alloys were prepared and subjected to different heat treatment processes. The evolution of microstructures, hardness, and machinability of the samples were investigated. It was found that the formation of martensite resulted in higher hardness, cutting forces, and tool wear during the drilling process. Samples with higher hardness also formed a thicker subsurface deformation area and increased burr heights. Ti-6Al-4V workpieces generally had higher surface roughness compared to Ti-6Al-7Nb specimens. The coat of the drilling bit was partially attacked in the as-cast specimens.
Article
Materials Science, Multidisciplinary
Hsueh-Chuan Hsu, Shih-Ching Wu, Yang-Jhe Su, Wen-Fu Ho
Summary: The study found that water-quenching and 400°C aging treatment are optimal for improving the bending strength/modulus ratio of Ti-5Nb-5Mo alloy, making it suitable for orthopedic and dental applications.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
L. M. Ferreira, N. Chaia, G. C. Coelho, C. A. Nunes
Summary: A correlation between the Nb/Mo contents in the beta-21S alloy and oxidation behavior at high temperatures was found. Increase in Nb content induces the formation of TiN and reduction of TiO2 scale. Additionally, microstructural changes associated with temperature increase strongly affect the oxidation behavior.
Article
Materials Science, Multidisciplinary
M. Paghandeh, A. Zarei-Hanzaki, H. R. Abedi, Y. Vahidshad
Summary: The study investigates the strain accommodation mechanism of Ti-6Al-4V alloy with different initial microstructures under warm temperature deformation regime. Tensile tests were conducted at various temperatures, revealing different material behaviors and strain accommodation mechanisms in equiaxed alpha+beta, lamellar alpha+beta, dual phase alpha+alpha, and fully alpha martensite microstructures. The results provide insights into the relationship between microstructure, strain accommodation capability, and tensile formability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Chemical
A. Pervikov, K. Suliz, S. Kazantsev, N. Rodkevich, S. Tarasov, M. Lerner
Summary: Novel mixtures of micro-and nanoparticles have been obtained by simultaneous electrical explosion of three intertwisted wires. The obtained alloy powders can be used to produce high-performance TiAl alloys.
Article
Materials Science, Multidisciplinary
M. Coffigniez, L. Gremillard, M. Perez, S. Simon, C. Rigollet, E. Bonjour, P. Jame, X. Boulnat
Summary: Through a core-shell approach, the diffusion of carbon and oxygen from the binder into the metallic powders was modeled and evaluated. Results indicate that diffusion/precipitation phenomena during non-isothermal treatments may lead to a saturated solid solution or the precipitation of titanium carbides. Mechanical behavior of 3D printed filaments was quantified by bending tests, showing a transition from brittle to ductile fracture depending on debinding parameters.
Article
Nanoscience & Nanotechnology
Donghai Li, Binbin Wang, Liangshun Luo, Xuewen Li, Jianxin Yu, Binqiang Li, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: The fracture characteristics and deformation behaviors of TiAl/Ti2AlNb composite are studied. Slip bands, tunnel cracks, deflected microcracks, and microcracks are involved in the fracture process, with dislocation glide and local microcracking being the main deformation behaviors. The relationship between deformation behaviors and fracture process of the composite is revealed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Longhui Yao, Liang Wang, Xiaojiao Song, Ran Cui, Binqiang Li, Qi Lv, Liangshun Luo, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: In this study, a Nb-18Si alloy with dispersion of hafnium carbide particles was fabricated through selective laser melting. The results showed that increasing the scanning speed improved the microstructure and the uniformity of hafnium carbide distribution, resulting in a higher fracture toughness of the alloy at room temperature.
Article
Materials Science, Multidisciplinary
Baoxian Su, Binbin Wang, Liangshun Luo, Liang Wang, Yanqing Su, Yanjin Xu, Binqiang Li, Ting Li, Haiguang Huang, Jingjie Guo, Hengzhi Fu, Yu Zou
Summary: In this study, the corrosion behavior of a wrought Ti-6Al-3Nb-2Zr-1Mo (Ti80) alloy in artificial seawater with different F- concentrations and pH values was systematically investigated. The results showed that increasing the F- concentration and reducing the pH value deteriorated the corrosion performance of the Ti80 alloy. The F- concentration mainly affected the anodic process, while the increase in pH played a significant role in inhibiting both cathodic and anodic processes. Surface characterizations revealed the preferential dissolution of the equiaxed alpha phase compared to the intergranular beta phase.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Jihao Wang, Tong Liu, Liangshun Luo, Xiaoye Cai, Binbin Wang, Junhao Zhao, Zonghui Cheng, Liang Wang, Yanqing Su, Xiang Xue, Jingjie Guo
Summary: In this study, a TiB2/AlMgScZr composite was fabricated using selective laser melting (SLM) and direct powder mixing. The results showed that TiB2 formed a coherent relationship with the matrix and promoted the precipitation of Al3Sc and Al3Zr phases during the SLM process. The SLM-fabricated TiB2/AlMgScZr composites exhibited excellent mechanical properties, surpassing those of conventional wrought Al alloys. However, the high heating and cooling rate in the SLM process weakened the strengthening effect of TiB2 in the composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Baoxian Su, Binbin Wang, Liangshun Luo, Liang Wang, Chen Liu, Yanqing Su, Yanjin Xu, Haiguang Huang, Jingjie Guo, Hengzhi Fu, Yu Zou
Summary: The influences of solution-aging treatments on the corrosion behaviors of a wrought Ti-6Al-3Nb-2Zr-1Mo alloy were investigated. The solution-aging treated alloys exhibited better corrosion performance than the wrought alloy due to the alleviated galvanic corrosion. In artificial seawater, all alloys displayed spontaneous passivation behavior, while in 5 M HCl, an activation-passivation transition occurred.
Article
Chemistry, Physical
Lei Luo, Zhongde Shan, Haoqin Yang, Yanqing Su, Liangshun Luo, Liang Wang, Jingjie Guo, Hengzhi Fu
Summary: This study uses a combination of travelling magnetic fields and sequential solidification to optimize the Ni-rich intermetallic in Al-Cu-based alloys with high Ni content, improving their performance at both room and elevated temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Zhiping Li, Liangshun Luo, Yanqing Su, Binbin Wang, Liang Wang, Tong Liu, Mengjia Yao, Chen Liu, Jingjie Guo, Hengzhi Fu
Summary: This study proposes a high-withdrawing-rate method to control the lamellar orientation in a beta-solidifying gamma-TiAl-based alloy, resulting in the successful preparation of polysynthetic twinned single crystal specimen with good lamellar control. The key to the control method lies in the thermal stabilization treatment and withdrawing rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
Yanan Wang, Binbin Wang, Liangshun Luo, Binqiang Li, Tong Liu, Junhao Zhao, Beibei Xu, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: In this study, a pre-alloyed Fe-22Cr-5.1Al-0.5Ti-0.26Y (wt%) powder was prepared using nitrogen atomization and characterized using FIB and TEM. An oxide dispersion strengthened bulk material was successfully fabricated using laser-based powder bed fusion. Micro-scale Y-Al-O complex oxides and nanoscale Y2O3 @TiN core-shell structures were observed in the fabricated material. The presence of residual oxygen in the atomization system and building chamber was found to be important for the formation of dual-scale secondary phases. The formation mechanism of the dual-scale secondary phases was elucidated through phase and composition analysis of the fabricated ODS steel. Epitaxial growth of columnar crystals with {001} < 100 > cubic alignments from the bottom of the molten pool during the PBF-LB process led to a weak cubic texture in the fabricated material. This cubic texture resulted in anisotropic tensile properties of the fabricated material.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Zhiwen Li, Liang Wang, Chen Liu, Junbo Zhao, Binbin Wang, Zhe Li, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: A Co-free non-equiatomic Ni2FeCr medium-entropy alloy was developed and studied for the Hall-Petch strengthening effect caused by grain boundaries and annealing twin boundaries. The alloy was prepared through cold rolling and recrystallization processes. It was found that the Ni2CrFe alloy forms a stable face-centered cubic solid solution. Tensile tests revealed that the alloy has a resistance to softening at high temperatures and the formation of dislocation pile-ups at annealing twin boundaries.
Article
Materials Science, Multidisciplinary
Min Wu, Jing Tao, Jihao Wang, Wei Jiang, Yueming Sun, Dingping Dong, Yu Zhao, Mengmeng Wang, Tong Liu, Liangshun Luo, Yanqing Su
Summary: In this paper, the effects of TB2 additions on the microstructure and mechanical properties of SLM-fabricated TiB2/Al-Mg-Sc alloys were studied. It was found that the addition of TiB2 increased the molten pool width, decreased the molten pool depth, and resulted in a fine-grained microstructure. The TiB2 additions also improved the tensile strength and elongation of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Botao Jiang, Liang Wang, Hui Yan, Jiliang Teng, Binbin Wang, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: TiB and TiC reinforced Ti-6Al-4V matrix composites were prepared using melt hydrogenation, with a total fraction of reinforcements at 5 vol % and a ratio of TiB to TiC at 1:1. The study investigated the effects of melt hydrogenation on the solidification process, phase composition, and microstructure of the titanium matrix, and observed the morphology and distribution of reinforcements with and without hydrogen. Nano-hardness measurements were also carried out. The results showed that melt hydrogenation can alter the solidification process, increase the b phase, and refine the lamellar structure. Hydrogen resulted in larger reinforcements that aggregated at the grain boundary, forming a network structure. Nano-hardness was slightly reduced by hydrogen for both the titanium alloy and the reinforcements. In summary, melt hydrogenation can maintain or slightly reduce the strength of the composites at room temperature and decrease the nano-hardness.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Composites
Botao Jiang, Liang Wang, Hui Yan, Guoqiang Zhu, Jiliang Teng, Binbin Wang, Liangshun Luo, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: This study investigates the effect of melt hydrogenation on the interface between reinforcements and matrix. A novel method called melt hydrogenation is used to directly incorporate trace hydrogen atoms into composites, which optimizes the interface bonding strength and improves load transfer efficiency. The thickness of the transition layer at the interface becomes thinner as the hydrogen content increases, and when the hydrogen content reaches a certain level, the atomic arrangement at the interface becomes orderly and strictly coherent.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Liang Wang, Botao Jiang, Xuan Wang, Ruirun Chen, Yingmei Tan, Liangshun Luo, Yanqing Su, Jingjie Guo
Summary: An advanced melt hydrogenation method was used to improve the poor hot workability of titanium matrix composites (TMCs). The (TiB+TiC)/Ti-6Al-4 V composites were fabricated by directly melting alloys in a gas mixture of H2 and Ar. The results showed that melt hydrogenation increased the length of TiB whiskers and aggravated the clustering of reinforcements, thereby improving the hot workability of TMCs in (' + beta) phase region. The formation of more dynamic recrystallization (DRX) grains and enhanced mobility of dislocations contributed to the improved hot workability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Yuexin Chu, Guishen Zhou, Shaoshan Wan, Yue Zhang, Fuyu Dong, Xiaoguang Yuan, Binbin Wang, Liangshun Luo, Yanqing Su, Weidong Li, Peter K. Liaw
Summary: The relationship between shear transformation zones (STZs) and serrated flow dynamics in metallic glasses (MGs) was analyzed using nanoindentation. Different plasticity MGs were studied, and two distinct types of serrated flow dynamics were identified. MGs with easily activated STZs or low loading rates exhibited a power-law distribution, indicating a self-organized critical state. In contrast, hard MGs or high loading rates showed a Gaussian distribution, indicating a chaotic state with reduced stresses required for plastic deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Hui Yan, Liang Wang, Xiaoming Wang, Botao Jiang, Hongcan Liu, Binbin Wang, Liangshun Luo, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: In this study, Ti-6Al-4V matrix composites reinforced with TiB ceramic whiskers were synthesized and hydrogenated using the melt hydrogenation technique. The effects of hydrogenation on the microstructure evolution and hot compression behavior of the composites were investigated. The results showed that hydrogenation significantly improved the hot workability of the composites and promoted the dispersion of TiB whiskers.
