Article
Chemistry, Physical
Aman Gupta, Saurabh Kumar Gupta, Sourabh Shukla, Diksha Mahadule, Rajesh K. Khatirkar
Summary: The influence of strain path and crystallographic texture on the electrochemical properties of cold-rolled Ti-15333 alloy was investigated. It was found that both strain path and crystallographic texture significantly affected the corrosion resistance of the alloy. Shear bands and α- and γ- fibers were observed as the strain increased. Multi-step cross rolling resulted in a strong Rotated Cube texture, which enhanced the corrosion resistance of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Crystallography
Diksha Mahadule, Murat Demiral, Hasan Mulki, Rajesh K. K. Khatirkar
Summary: The present study experimentally and numerically investigated the effect of unidirectional cold rolling on the evolution of crystallographic texture in a Ti-15333 alloy. Microstructures were studied using an optical microscope and scanning electron microscope, while X-ray diffraction was used for studying the crystallographic texture after cold rolling. The rolling process was simulated using the PRISMS-plasticity software. The results showed that both experimentally and numerically, the gamma-(normal direction) and alpha-(rolling direction) fibers strengthened with cold rolling, and the simulated orientation distribution functions matched well with experimental results. The average values of von Mises stress and von Mises strain increased with increasing deformation.
Article
Materials Science, Multidisciplinary
Nihal Yumak, Kubilay Aslantas
Summary: The effects of various heat treatment procedures on the mechanical properties of the Ti-15V-3Al-3Sn-3Cr metastable beta titanium alloy were investigated. Optimum tensile properties were obtained in the duplex-aged samples. Fine, high volume fraction and uniformly dispersed alpha phases increased the tensile strength and % elongation of the alloy, but also increased the fatigue crack propagation rate.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
K. Vamsi Krishna, M. K. Talari, Bharath Bandi, Sriharitha Rowthu, M. I. Khan, P. Mastanaiah, N. Kishore Babu
Summary: In this study, the influence of welding speed and post-weld heat treatment on the microstructure and mechanical properties of Ti-15V-3Al-3Cr-3Sn electron beam welds was systematically investigated. Welds produced at a speed of 800 mm/min exhibited higher ultimate tensile strength and hardness compared to welds produced at a speed of 500 mm/min. This higher strength can be attributed to the narrower columnar width of beta grains and the presence of equiaxed grains in the weld.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Characterization & Testing
Nihal Yumak, Kubilay Aslantas, Ahmet Cetkin
Summary: This study examined the effects of single and duplex aging treatment on a metastable beta titanium alloy, in combination with cryogenic treatment. It was found that cryogenic treatment led to the formation of martensitic alpha phases and preaging treatment after cryogenic treatment prevented the formation of precipitate-free zones. The optimum mechanical properties were achieved in samples aged 20 h at 450 degrees C and in cryogenic treatment followed by 250 degrees C/10 h + 450 degrees C/20 h duplex aging treatment.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Engineering, Chemical
Miriam Loebbecke, Tolga J. Bayerbasi, Marion Bartsch, Jan Haubrich
Summary: Adhesive bonding of similar and dissimilar materials is crucial for lightweight design in automotive and aerospace industries. Ti15-3/PEEK joints were optimized through different surface pretreatments, including laser and chemical methods. The bonding strength and aging resistance were significantly improved with micro- or nanostructuration, indicating that nanomechanical interlocking plays a key role in producing stable joints.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Materials Science, Characterization & Testing
Nihal Yumak, Kubilay Aslantas
Summary: This study investigated the fatigue crack propagation behavior of Ti-15V-3Al-3Sn-3Cr alloy with aging treatments under constant and variable amplitude loading. Different aging temperatures and times were applied to the alloy, and the results showed that these factors affected the crack propagation rate. Additionally, the impact of overload was observed, with the solution-treated sample showing increased crack propagation rate and the aged specimen exhibiting fracture due to the formation of microcracks.
JOURNAL OF TESTING AND EVALUATION
(2022)
Article
Nanoscience & Nanotechnology
Nana Chen, Hongchao Kou, Zhihong Wu, Fengming Qiang, Ke Hua, Jiangkun Fan, Bin Tang, Jinshan Li, Jon M. Molina-Aldareguia
Summary: The bimodal microstructure of Ti-7333 alloy was successfully controlled through thermomechanical processing to achieve specific strength and ductility combinations. Strength was mainly influenced by secondary αs precipitation, while ductility was tuned through primary α(P), rod-like α(r), and retained β phases. Failure analysis indicated that the alloy's ductility depended on preventing the formation of continuous grain boundary α(CGB) phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Di Pei, Li Wang, Zhibao Ge, Zhongkui Yuan, Xuhao Hu, Xinlin Li, Xiang Wang
Summary: The microstructure evolution and mechanical properties of as-homogenized Mg-3Al-3Sn-1Zn alloy during high-speed rolling were studied. The main deformation mechanism involved twinning and dislocation migration. After the sixth pass of rolling, a fine and uniform microstructure with a grain size of 1.1 μm was achieved, along with a high yield strength, ultimate tensile strength, and elongation to failure. Low-temperature short-time annealing resulted in a further refinement of grain size and improved ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nuclear Science & Technology
K. Vamsi Krishna, Sriharitha Rowthu, Vijay N. Nadakuduru, Ganesh Pilla, N. Kishore Babu
Summary: Titanium alloys are widely used in aerospace applications due to their high strength-to-weight ratio, corrosion resistance, and outstanding mechanical performance. Gas tungsten arc welding (GTAW) offers the potential to achieve welds of equal quality to electron beam welding or laser beam welding at much lower capital costs. The present study investigates the influence of heat input on the microstructure and mechanical properties of a metastable beta titanium alloy welded by GTAW. The results show that welding speed significantly affects the width of the fusion zone and the mechanical properties of the welds. Welds at higher speeds exhibit higher ultimate tensile strength and hardness due to the formation of equiaxed grains and lower columnar width of the beta grains.
FUSION SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Deepak Sharma, David Parfitt, Bryan Roebuck, Sitarama Raju Kada, Daniel Fabijanic, Michael E. Fitzpatrick
Summary: This work investigates the influence of single-aging and duplex-aging treatments on the microstructure evolution and properties of Ti-5553 β-Ti alloy. The results show that both single-aged samples with a slow heating rate and duplex-aged samples exhibit similar microstructures and microhardness under all aging conditions. In addition, a correlation model between microhardness values and the width of alpha-phase has been established.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Deepak Sharma, Sitarama Raju Kada, Daniel Fabijanic, David Parfitt, Bo Chen, Bryan Roebuck, Michael E. Fitzpatrick, Matthew Robert Barnett
Summary: This study explores the ageing response of DLD built Ti-5553 beta-Ti alloy, aiming to achieve a bimodal (beta + alpha) microstructure that provides improved properties. Direct ageing at a fast heating rate under specific conditions resulted in a unique microstructure with refined intragranular and discontinuous grain boundary alpha-phase. The interparticle spacing between the alpha-phase showed correlation with microhardness and yield stress values for all aged samples.
ADDITIVE MANUFACTURING
(2021)
Article
Electrochemistry
Longfei Xie, Wenlong Zhou
Summary: This study systematically evaluates the salt spray corrosion behaviors of Ti-15-3 titanium alloy using electrochemical impedance spectroscopy (EIS), electrochemical noise (EN) tests, and surface analysis. The results distinguish metastable pitting, passive state, and stable pitting of the alloy, and connect pitting resistance and corrosion types with the attack morphology of the samples. The salt spray corrosion mechanisms of Ti-15-3 alloy are discussed, providing insights into the protection measures against pitting corrosion.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2022)
Article
Metallurgy & Metallurgical Engineering
Nihal Yumak
Summary: Multi-step aging treatments were conducted on the Ti-15V-3Al-3Sn-3Cr alloy, and it was found that cryogenic treatment can improve the material's hardness, reduce friction coefficient, and decrease mass loss.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2022)
Article
Engineering, Multidisciplinary
Nihal Yumak, Kubilay Aslantas, Ahmet Cetkin
Summary: This study investigates the effect of cryogenic treatment on metastable P. titanium alloys, specifically focusing on the microstructural and mechanical properties. It finds that the duplex aging treatment after cryogenic treatment leads to finer α phase precipitation and significant strength improvement without sacrificing elongation. Moreover, the crack propagation resistance of the duplex aged samples is higher compared to single-step aged samples.
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
(2022)
