Article
Materials Science, Multidisciplinary
Jingqi Zhang, Xinyu Xu, Jiayu Xue, Sinong Liu, Qinghua Deng, Feng Li, Jie Ding, Hui Wang, Hui Chang
Summary: The hot deformation behavior and microstructure evolution mechanism of TC19 titanium alloy were studied. The flow behavior of the alloy and its hot processing map were predicted using experimental and modeling analysis. It was found that the deformation mechanism was mainly controlled by the deformation rate, leading to different deformation mechanisms and grain structures at different deformation rates.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Alessandro Carrozza, Alberta Aversa, Paolo Fino, Mariangela Lombardi
Summary: This study investigates the transformations of the Ti-6Al-2Sn-4Zr-6Mo alloy at different temperatures and customizes its mechanical properties through heat treatments. Different annealing treatments result in diverse microstructures and tensile properties.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Huizhi Peng, Shun Wu, Wen Hao Kan, Samuel Chao Voon Lim, Yuman Zhu, Aijun Huang
Summary: Post heat treatment is essential for additively manufactured alloys. This study investigated the hardening response of a Ti-6Al-2Sn-4Zr-6Mo alloy processed by laser powder bed fusion (LPBF) to a one-step heat treatment. The results revealed significant hardening at both 500 degrees C and 650 degrees C. The unique microstructure consisting of alternating long beta laths and short alpha laths, along with the influence of both types of laths on the alpha lath thickness, provides new insight for the design of new LPBF-processed Ti alloys.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Hany Hassanin, Yahya Zweiri, Laurane Finet, Khamis Essa, Chunlei Qiu, Moataz Attallah
Summary: This study applied a deep learning neural network to predict the densification and hardness of Ti-6Al-2Sn-4Zr-6Mo alloy fabricated using laser powder bed fusion, with process optimization results indicating near-full densification achieved within a specific energy density range. The sensitivity of porosity and hardness to island size, especially at high energy density, was also highlighted, along with the effectiveness of hot isostatic pressing in eliminating porosity and improving hardness. The developed deep learning neural network model demonstrated high accuracy in predicting material properties with a mean percentage error of 3% and 0.2% for porosity and hardness, respectively, suggesting its potential as an efficient tool for predicting properties with limited data.
Article
Chemistry, Physical
Alessandro Carrozza, Alberta Aversa, Paolo Fino, Mariangela Lombardi
Summary: This study investigated the most suitable process window for the titanium alloy Ti-6Al-2Sn-4Zr-6Mo using LPBF technology. The effects of different process parameters on the microstructure, phases, and mechanical properties of the material were thoroughly studied, showing superior strength of the alloy suitable for aerospace industry applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
Oleksandr Lypchanskyi, Tomasz Sleboda, Marek Wojtaszek, Krzysztof Muszka, Aneta Lukaszek-Solek, Rafal Stanik, Maik Gude
Summary: This paper analyzes the hot deformation behavior of Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) alloy through hot compression tests and dynamic material modeling theory; processing maps were developed based on Prasad's criterion to determine potentially favorable combinations of parameters; optimal processing parameters for numerical modeling were selected and forging tests were conducted for Ti-6246 alloy.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2021)
Article
Chemistry, Physical
Sidharth Rajan, Priti Wanjara, Javad Gholipour, Abu Syed Kabir
Summary: The study investigated the fatigue behavior of dissimilar titanium alloys, Ti-6Al-4V (Ti64) and Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti6242), joined by linear friction welding (LFW), revealing similar performance to the base metals in both low- and high-cycle fatigue regimes. Further metallurgical characterization and comparison of fatigue limits were conducted to understand the fatigue failure mechanisms of the joints.
Article
Engineering, Mechanical
M. E. Harr, S. Daly, A. L. Pilchak
Summary: Research found that slip activity in Ti-6Al-2Sn-4Zr-2Mo was more rapid and accumulated more at lower temperatures exhibiting dwell sensitivity, compared to higher temperatures. Plasticity primarily occurred through long-range basal slip in colocated grains with a high basal Schmid factor at all temperatures.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Metallurgy & Metallurgical Engineering
Hiroaki Matsumoto
Summary: This study investigated the dynamic microstructural conversion behavior of Ti-6246 alloy during hot forging process, with a focus on the dynamic globularization of the alpha phase. It was found that a combination of the Avrami approach and machine learning could reliably predict dynamic globularization, particularly under specific processing conditions with higher temperature and dynamic globularization fraction.
ISIJ INTERNATIONAL
(2021)
Article
Chemistry, Physical
Sidharth Rajan, Priti Wanjara, Javad Gholipour, Abu Syed Kabir
Summary: This paper presents the microstructural characteristics and mechanical properties of linear friction-welded Ti-6242 in as-welded and stress relief-annealed conditions. The study found that stress relief annealing helps to recover hardness values, and the tensile and fatigue properties of the welds meet or exceed the requirements in AMS specifications.
Article
Nanoscience & Nanotechnology
Haiyang Fan, Chengcheng Wang, Yujia Tian, Kun Zhou, Shoufeng Yang
Summary: This study investigated the feasibility of using L-PBF to fabricate two Ti-6Al-4V-based bimetals, Ti-6Al-4V/γ-TiAl and Ti-6Al-4V/Ti-6242, which may have great potential for the future manufacturing of aerospace components. The bimetal Ti-6Al-4V/γ-TiAl was unsuccessfully built due to the intrinsic cold cracking of γ-TiAl processed by L-PBF. In comparison, the bimetal Ti-6Al-4V/Ti-6242 was successfully manufactured by L-PBF with a solid and defect-free interface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Jesus Jaquez-Munoz, Citlalli Gaona-Tiburcio, Alejandro Lira-Martinez, Patricia Zambrano-Robledo, Erick Maldonado-Bandala, Oliver Samaniego-Gamez, Demetrio Nieves-Mendoza, Javier Olguin-Coca, Francisco Estupinan-Lopez, Facundo Almeraya-Calderon
Summary: This research investigates the corrosion behavior of three titanium alloys using CPP and EN techniques, revealing that Ti-6Al-4V has the highest corrosion rate in both electrolytes, while Ti-6Al-2Sn-4Zr-2Mo shows pseudopassivation in NaCl but with a lower corrosion rate.
Article
Nanoscience & Nanotechnology
Xiaogang Wu, Bowen Zhang, Youyun Zhang, Hongzhi Niu, Deliang Zhang
Summary: A powder metallurgy near alpha titanium alloy was fabricated by in-situ dehydrogenation and hot extrusion, leading to three different microstructures. Despite similar strength, the Type II microstructure exhibited significantly lower ductility compared to the other types.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Harish Chandra Kaushik, Mahdi Habibnejad Korayem, Amir Hadadzadeh
Summary: This study investigates the kinetics of phase transformation in L-PBF titanium alloys using differential scanning calorimetry (DSC). Both non-isothermal and isothermal kinetics models were developed, and the effects of alloying elements and initial microstructure on the transformation kinetics were discussed. The results provide insights into the design of heat treatments to achieve desired microstructures and properties in L-PBF titanium alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Zhiguang Zhu, Fern Lan Ng, Hang Li Seet, Sharon Mui Ling Nai
Summary: This study investigated the effect of heat treatment on the microstructure evolution and mechanical properties of Ti-6Al-2Sn-4Zr-2Mo (Ti6242) alloy fabricated by laser powder bed fusion. Different heat treatment profiles were conducted to tailor the microstructure and tensile properties. The results showed that a combination of laser powder bed fusion and post heat treatment could allow for the fabrication of complex-shaped Ti6242 components with a balanced combination of strength and ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.