Article
Chemistry, Physical
S. Pilz, A. Hariharan, F. Guenther, M. Zimmermann, A. Gebert
Summary: This study reveals the influence of omega iso precipitates on the deformation mechanisms and mechanical properties of a biomedical beta-type Ti-40Nb alloy. The results show that the fraction and size of omega iso increased with increasing aging time, leading to an increase in Young's modulus and proof stress. The active deformation mechanisms also changed with aging time, resulting in significant alterations in mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jiawen Feng, Wanyuan Gui, Qian Liu, Wenya Bi, Xuechong Ren, Yongfeng Liang, Junpin Lin, Benli Luan
Summary: In this study, the electron beam selective melting (EBM) technique was used to shape Ti-48Al-2Cr-2Nb alloy, resulting in high-density samples. The mechanism of phase transformation and microstructural evolution as well as the interaction with tensile properties were investigated. The EBM-formed Ti-48Al-2Cr-2Nb alloy exhibited a unique microstructure and superior mechanical properties.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Bingnan Qian, Srinivas Aditya Mantri, Sriswaroop Dasari, Jinyong Zhang, Lola Lilensten, Fan Sun, Philippe Vermaut, Rajarshi Banerjee, Frederic Prima
Summary: The work proposes a novel strategy to enhance the strength while preserving good ductility in the TRIP/TWIP Ti-12Mo alloy by coupling omega(iso) formation and mechanical twinning/martensitic transformation. After aging at 200 degrees C for 60s, an unprecedented combination of tensile properties is recorded, with a yield stress of 865MPa (80% higher than classic Ti-12Mo) and a uniform elongation of 0.35. Higher yielding stress (990MPa) is achieved with an increased aging duration of 150s, where mechanical twinning is still active.
Article
Chemistry, Physical
Sujung Son, Dowon Lee, Hyeonseok Kwon, Jongun Moon, Ki Beom Park, Aeree Kim, Jungwoo Choi, Jin-Hwan Jeong, Sungho Cho, Hyoung Seop Kim
Summary: A new class of Ti-containing medium-entropy alloys (Ti-MEAs) was designed and three equiatomic Ti-MEAs were successfully cast. The microstructures and yield strengths of the newly designed Ti-MEAs were systematically investigated, providing important insights for further designing Ti-MEAs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Xuan Wang, Yan Tang, Maohua Quan, Lei Zheng, Ye Meng
Summary: In this study, Nb-27.3Ti-18Al alloys with columnar strengthening phases were fabricated by SPS and MA. The microstructure evolution and toughening mechanisms of two different powders were analyzed, showing the promotion of columnar phase formation by a specific powder and the good fracture toughness of alloy with 27.3 atomic percentage Ti content.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Junshuai Wang, Wenlong Xiao, Yu Fu, Lei Ren, Bo Song, Cuiyun Liu, Chaoli Ma
Summary: This study investigates the effect of initial microstructure on the aging behavior and subsequent mechanical properties of metastable beta-type Ti-38Nb-0.2O alloy. It is found that cold rolling and solution treatment lead to different microstructures and affect the strength and Young's modulus of the aged specimens.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Marcio Sangali, Victor C. Opini, Alberto Z. Fatichi, Mariana G. Mello, Leonardo Fanton, Rubens Caram, Alessandra Cremasco
Summary: This study investigates the effects of V replacement with Nb on the microstructure and properties of Ti-5553 and Ti-12553 alloys after aging heat treatment. It was found that the microstructure consisted of precipitates in a b matrix, with larger precipitates at a faster heating rate. The coarsening microstructure resulted in decreased mechanical strength but improved ductility. The replacement of V with Nb and the resulting microstructure did not affect the corrosion resistance of the samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Jie Fu, Hee Young Kim, Shuichi Miyazaki
Summary: This study demonstrates that adding nitrogen can help achieve a superior combination of high strength and ultra-low modulus in Ti-Zr based alloys. The addition of nitrogen facilitates the formation of nano-sized lattice modulation structure and impedes stress-induced martensitic transformation, resulting in higher apparent yield stress and non-linear elasticity in the alloy.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Beibei Wei, Bin Tang, Yudong Chu, Lihua Du, Xiaofei Chen, Lei Zhu, Jinshan Li
Summary: The effect of rolling process on the microstructure and mechanical properties of TNM alloy sheets was investigated. The microstructure transformed from lamellar to duplex structure as the rolling reduction increased. A novel Z-type lamellar structure was formed at 67.5% deformation strain. The βo phase decomposed and transformed to α2+γ phases with increased reduction.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Feng Zhang, Jun Feng, Wei Xiang, Qiang Fu, Wuhua Yuan
Summary: In this study, it was found that slow heating during the aging process of the TB18 alloy can lead to finer intragranular alpha plates due to the abundance of omega/beta interfaces provided by omega iso particles. This provides heterogeneous nucleation sites for alpha precipitates and reduces the nucleation driving force. Appropriate omega-assisted nucleation can enhance the ductility of the TB18 alloy without reducing its strength, resulting in optimal comprehensive mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
X. J. Jiang, L. W. Zhang, G. W. Sun, J. H. Yang, Q. X. Ran, H. Y. Wu
Summary: The continuous grain boundary alpha phase of a Ti-based alloy is optimized by a combination of deformation and heat treatment, resulting in the attainment of an equiaxial discontinuous grain boundary alpha phase. The ductility is greatly improved while the strength remains high (strength of 1280 MPa and elongation of 10%). This paper introduces a new approach for strengthening and toughening metal materials, with the near duplex microstructure showing significantly better mechanical properties than traditional lamellar, duplex, or equiaxial microstructures. This research should be of interest for those working in the field.
Article
Materials Science, Multidisciplinary
Xiaotong Bao, Talante Juma, Xuan Li, Jili Ding, Xiaobin Liu, Shanshan Liu, Junwen Li, Yongping Cao, Tao Zhang
Summary: In this research, a new series of beta duplex phase Ti50Zr25Nb25-xAgx alloys were prepared by rapid solidification process. The microstructure, mechanical properties, antibacterial properties, ion release behavior, and biocompatibility of the alloys were systematically investigated. The alloys exhibited low Young's modulus, high strength and hardness, and good antibacterial activity and biocompatibility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Man-Ping Chang, Te-Hua Fang, Ting-Yu Zhu, Jau-Wen Lin
Summary: In this study, the mechanical properties and deformation mechanisms of CoCrFeNiMnx high entropy alloys (HEAs) were investigated through molecular dynamics (MD) simulation. Uniaxial tensile tests were conducted at different temperatures and manganese compositions, and a circular defect was created to study the damage tolerance of these HEAs. The results showed that the CoCrFeNiMn HEA exhibited a strong temperature dependence, with the ultimate tensile strength decreasing as the temperature increased. The early stage deformation was dominated by dislocation slip, while grain boundary glide played a major role in the later stage deformation. The higher manganese content led to the formation of hexagonal close-packed (HCP) and amorphous phases, which reduced the strength of CoCrFeNiMnx HEAs. Among the compositions tested, Mn5 HEA showed the best damage tolerance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jian Wu, Xiaoyan Liu, Heguo Zhu
Summary: The conflict between strength and ductility in structural materials has always been a challenge. It has been found that introducing nano-scaled precipitates through composition design can help achieve a balance between strength and ductility. In this study, FeCoNi-based medium-entropy alloys with Al and Ti combination addition were prepared and their phase constitution, microstructural changes, and mechanical properties were investigated. By adjusting the Al/Ti ratio, the as-cast Ni0.6CoFe1.6 MEA exhibited a good combination of strength and ductility, with the Al0.2Ti0.1 MEA showing the highest yield and ultimate tensile strength, as well as an acceptable failure strain.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Shang-Yi Ma, Qiu-Jie Chen, Wen-Yu Zhang, Shao-Qing Wang
Summary: In this study, the heterophase interfaces of beta/omega and beta/alpha in beta-Ti alloys were carefully studied using first-principles method. The calculations showed that the intermediate state at interface can smooth the structure changes, thereby reducing the interfacial energy. The effects of beta-stabilizers on the nucleation morphologies of omega and alpha phases were described from the perspective of interfacial energies and interfacial anisotropy.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Alberto Z. Fatichi, Mariana G. de Mello, Karina D. Pereira, Luisa G. M. Antonio, Augusto D. Luchessi, Rubens Caram, Alessandra Cremasco
Summary: The electrochemical, structural, and biological properties of self-organized amorphous and anatase/rutile titanium dioxide (TiO2) nanotubes deposited on Ti-35Nb-4Zr alloy through anodization-induced surface modification were investigated. The study found that anatase TiO2 exhibited higher surface corrosion resistance and cell viability compared to amorphous TiO2, indicating the importance of TiO2 nanotube crystallization in the material's electrochemical behavior and biocompatibility.
CERAMICS INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Douglas Junior da Silva, Rodrigo Contieri, Alessandra Cremasco, Ricardo Floriano
Summary: Co-based alloys are suitable for joint replacements due to their biocompatibility and mechanical properties. This study evaluated the effects of cooling rate on the microstructure and hardness of a knee implant made of Co-28Cr-6Mo alloy, finding that high cooling rates resulted in grain refinement and increased hardness.
INTERNATIONAL JOURNAL OF METALCASTING
(2022)
Article
Materials Science, Multidisciplinary
Eber de Santi Gouvea, Mariana Correa Rossi, Angel Vicente Escuder, Conrado Ramos Moreira Afonso, Vicente Amigo Borras
Summary: The influence of open vessels and milling time on the microstructure homogeneity and oxygen content in the beta Ti-Nb-Mo system microstructure was investigated. The study found that the beta phase increased with longer milling times, and strain hardening on particles was observed after 40 hours in the continuous mode. Oxygen content dropped slightly until 40 hours and increased after 60 hours, which was linked to the observed hardening. The research also showed that suitable mechanical properties were achieved after 40 hours in the continuous mode, as hardness and bending strength were closer to bone tissue.
Article
Materials Science, Ceramics
Virgilio P. Ricci, Conrado R. M. Afonso, Rafael F. M. dos Santos, Alberto M. Jorge Junior, Virginie Roche
Summary: This study evaluated the surface optimization of beta-Ti-40Nb alloy in terms of corrosion and bioactivity properties. The results showed that after anodization and annealing, the surface morphology and crystalline phases of the alloy remained stable, and pre-calcification treatment improved its bioactivity.
CERAMICS INTERNATIONAL
(2022)
Article
Thermodynamics
R. F. M. Santos, V. P. Ricci, C. R. M. Afonso
Summary: This study aims to obtain continuous cooling transformation (CCT) diagrams for metastable beta Ti-12Mo-6Zr-2Fe (TMZF) and stable beta Ti-40Nb alloys and analyze their microstructure, elastic modulus, and Vickers microhardness under varied cooling rates. The results show that with an increase in cooling rate, both alloys exhibit lower Vickers microhardness and elastic modulus values.
THERMOCHIMICA ACTA
(2022)
Article
Materials Science, Multidisciplinary
Rafael Formenton dos Santos, Mariana Correa Rossi, Andre Luiz Vidilli, Vicente Amigo Borras, Conrado Ramos Moreira Afonso
Summary: The novelty of this work lies in the correlation between Moeq and mechanical and surface parameters. Ti-15Nb (TN-15), Ti-40Nb (TN-40), Ti-33Nb-33Zr (TNZ-33), Ti-40Nb-40Zr (TNZ40), and Ti-35Nb-7Zr-5Ta (TNZT) alloys were obtained by casting. The addition of Nb and Zr influenced the lattice parameters and crystal structure of the alloys. Grain size decreased with the addition of Nb and Zr, and roughness decreased as well. The contact angle and free energy surface values were inversely proportional, and the mechanical properties showed a similar trend to the Moeq values and cell parameter of phase b.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Chaiane M. Caneda, Piter Gargarella, Rudimar Riva, Claudio S. Kiminami, Conrado R. M. Afonso
Summary: Fe76.5Nb8.5B15 (at.%) ultrafine eutectic (UE) coatings were processed by laser cladding, resulting in the formation of nanoscale borides that improved mechanical properties. The wear performance of the coatings and substrate was evaluated, showing different wear mechanisms such as abrasive, adhesive, shearing, and delamination. Oxide particles responsible for tribofilm formation and debris nanoparticles from fracture or breakage were observed. Overall, the Fe-Nb-B ultrafine eutectics laser clad coatings exhibited comparable or superior wear resistance properties to commercial alloys and other materials processed by rapid solidification.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Marcio Sangali, Victor C. Opini, Alberto Z. Fatichi, Mariana G. Mello, Leonardo Fanton, Rubens Caram, Alessandra Cremasco
Summary: This study investigates the effects of V replacement with Nb on the microstructure and properties of Ti-5553 and Ti-12553 alloys after aging heat treatment. It was found that the microstructure consisted of precipitates in a b matrix, with larger precipitates at a faster heating rate. The coarsening microstructure resulted in decreased mechanical strength but improved ductility. The replacement of V with Nb and the resulting microstructure did not affect the corrosion resistance of the samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Marcio Sangali, Alessandra Cremasco, Juliano Soyama, Rubens Caram, Rodrigo J. Contieri
Summary: With the continual advancement of Additive Manufacturing technology, the optimization of microstructure and properties has been made possible. However, the correlation between microstructure and corrosion properties remains unclear, calling for more systematic investigations.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Vinicius C. Ottani, Mariana S. Pereira, Matheus S. T. Arruda, Mariana C. Rossi, Conrado R. M. Afonso
Summary: Ni-based superalloys are widely used in aircraft engines, turbines, and petrochemical industry due to their superior mechanical, corrosion, and oxidation resistance at high temperatures. The chemical composition and heat treatments influence the phases formed and the mechanical strength of these alloys. There is a lack of research on ternary superalloys based on Ni-Nb and the effect of the third alloying element on the microstructure and microhardness. This study aims to characterize pseudo-eutectic alloys of the Ni-15Nb-xM and Ni-20Nb-xM systems and investigate the influence of alloy elements and heat treatments on their microstructure and properties.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Pedro Akira Bazaglia Kuroda, Carlos Roberto Grandini, Conrado Ramos Moreira Afonso
Summary: This study aims to investigate the structure of Ti-25Ta-xZr system alloys (x = 0, 10, 20, 30, and 40% wt.) through melting and hot-rolling processes using Rietveld's technique. The findings demonstrate that the addition of zirconium as a β phase stabilizer increases the lattice parameters of the phases and reduces the elastic modulus values and atomic packing factor (APF) of the alloys. Hot-rolling induces α phase formation and increases the APF of the alloys. The average crystalline size and micro-strain of the structures were determined using the William-Hall technique.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mariana P. Medeiros, Amanda P. Carvalho, Augusta Isaac, Conrado R. M. Afonso, Milos Janecek, Peter Minarik, Mayerling Martinez Celis, Roberto B. Figueiredo
Summary: The effect of high pressure torsion processing on the mechanical properties and corrosion behavior of various magnesium alloys was studied. Severe plastic deformation processing improved the strength of all alloys, but deformation localization occurred in the Mg-Zn-Ca and Mg-Y-RE alloys. Pure magnesium, Mg-Zn, and Mg-Li-Y alloys exhibited good corrosion resistance with low corrosion rates and maintained integrity after 28 days of immersion.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Rafael Formenton Macedo dos Santos, Carolina Neves Reis, Conrado Ramos Moreira Afonso
Summary: There has been a growing interest in the search for metallic alloys with favorable mechanical and chemical characteristics that elicit a positive biological response in recent years. Among these alloys, ss-Ti alloys have attracted significant attention due to their low elastic modulus and excellent biocompatibility. This study aimed to characterize ss-Ti alloys within the Ti-Nb-Zr system and investigate the influence of the proportion of ss-stabilizing or betagenic elements on the microstructure and properties of the alloys.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rodrigo Jose Contieri, Ricardo Floriano, Mario Henrique Fernandes Batalha, Andre Ferrara Carunchio, Jose Eduardo May, Alessandra Cremasco
Summary: This study evaluated the mechanical and corrosion properties of friction stir welded aluminum alloy profiles and found that high rotational speed reduces welding efficiency. Different welding conditions have minimal impact on corrosion characteristics, but are related to the dispersion of precipitates in the aluminum matrix.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2022)
