Article
Nanoscience & Nanotechnology
Dhrubjyoti Baruah, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: This study investigates the effect of temperature on the mixed-mode fracture response of a rolled AZ31 Mg alloy. Experimental results show that the fracture toughness Jc enhances by a factor of about 3.5, irrespective of mode mixity over the temperature range studied. The change in fracture mechanism from brittle cracking to ductile void growth and coalescence is observed as the temperature increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Lin Li, Jie Yang, Zhiyuan Yang, Qi Sun, Li Tan, Qinghui Zeng, Minhao Zhu
Summary: Deformation twins play a crucial role in plastic deformation and affect the microstructural evolution and fatigue behavior of magnesium alloys. The study investigated the fatigue behavior of a rolled magnesium alloy using SEM and EBSD, revealing that {1012} twinning dominates the fatigue deformation process and residual twins increase with fatigue cycles. Cracks tend to initiate and propagate along {1012} twinning boundaries and slip bands, with numerous extrusions found in twinned areas.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
S. Arjun Sreedhar, Dhrubjyoti Baruah, Gyan Shankar, Satyam Suwas, R. Narasimhan
Summary: This study investigates the fracture behavior of AZ31 Mg alloy at different temperatures. Experimental results show that the fracture mechanism changes from brittle cracking to ductile void growth as temperature increases. Increased temperature also leads to increased twinning and texture changes in the far-edge of the ligament.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Materials Science, Multidisciplinary
Dhrubjyoti Baruah, K. V. Vaishakh, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: The mixed-mode fracture behavior of fatigue pre-cracked AZ31 Mg alloy specimens is compared with pre-notched samples using optical imaging and digital image correlation. The fracture toughness is highest for mode I and decreases significantly with increasing mode II component. Additionally, the fracture toughness is 2-3 times higher for the pre-notched samples compared to the pre-cracked specimens. This is attributed to quasibrittle failure in the latter and a combination of ductile and brittle fracture surface features in the former. Profuse tensile twinning at the far-edge of the ligament is observed in the notched specimens, contributing to the toughness enhancement.
PHILOSOPHICAL MAGAZINE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Young-Bum Chun
Summary: The recrystallization behavior of Fe-18Mn-9Cr-2Al-xC steels with varied carbon contents was investigated during annealing at different temperatures. The study found that the presence of carbides affected both nucleation and growth of new grains, with higher carbon contents inhibiting the growth of new grains. Additionally, the tensile properties of the cold-rolled steels were found to be restored after recrystallization.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Shiqiu Liu, Yaofeng Luo, Hongsheng Ding, Ruirun Chen, Jingjie Guo, Hengzhi Fu
Summary: High-density deformation nanotwins significantly strengthen TiAl-based alloys, but usually result in a reduction in fracture toughness for most structural materials. It is necessary to investigate the benefits of high-density deformation nanotwins for improving the fracture toughness of TiAl-based alloys. In this study, the fracture toughness of two heat-treated Ti-45.5Al-4Cr-2.5Nb alloys with a favorable twinning deformation mechanism is compared with that of the unannealed alloy. It is found that the heat-treated alloys exhibit higher fracture toughness than the unannealed alloy. Shear ligaments and slip bands are the main toughening mechanisms for the heat-treated alloys, which are closely related to the enhanced plastic deformability of lamellar structures. Moreover, the increase in (B2 + gamma)-coupled structures has a negative effect on the toughening of the investigated alloys. High-density deformation nanotwins improve the fracture toughness of TiAl-based alloys by enhancing their fracture strength and plastic deformability, while reducing their work-hardening exponent.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Mechanics
Seung-Ho Lee, Hyun-Woo Jung, Yun-Jae Kim, Kamran Nikbin, Robert A. Ainsworth
Summary: This study analyzes 316H creep crack growth data at 550 degrees C to investigate the effect of inplane constraint on creep crack initiation times. A constraint parameter is proposed to quantify the difference between actual opening stress and the Riedel-Rice opening stress field, using experimentally measured C*. The analysis shows that creep crack initiation times can be well characterized by the C* integral with the proposed parameter, and a modified model suggests a reduction in scatter in predictions from -40 to -5.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Dewen Hou, Yuzhi Zhu, Haiming Wen
Summary: The study found that the initial basal texture of the material influences the activities of twinning and slips, leading to anisotropic deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jie-Wen Zhang, Jia-Xiang Wang, Xiao-Wei Zou, Irene J. Beyerlein, Wei-Zhong Han
Summary: This study investigates the strengthening of interface-dominate properties at nanoscale dimensions. Through the analysis of alpha-Zr sandwiched by alpha/beta interfaces, it is found that the refinement of alpha/beta lamellar structures significantly enhances the formability of the Zr-2.5Nb alloy. High density alpha/beta interfaces are found to enhance the activity of dislocations and deformation twins, ultimately increasing the formability of the alloy.
Article
Materials Science, Multidisciplinary
Zhi-Hao Zhao, Gang Yao, Lai-Ma Luo, Xiang Zan, Qiu Xu, Yu-Cheng Wu
Summary: An investigation into the tensile properties of WYZ alloys with different orientations and recrystallization states at high temperatures showed that recrystallization annealing increased ductility but decreased strength. Orientation and annealing had no significant effect on ductile-to-brittle transition temperature (DBTT) from tensile data, although increasing strain rate would overestimate DBTT.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
T. Nakata, C. Xu, S. Kamado
Summary: After cold-rolling an Mg-6Zn-0.3Ca alloy sheet with a strong basal texture, anomalous double twinning occurred with the (0001) pole aligned to the transverse direction. These twins served as nucleation sites for statically recrystallized grains during annealing, resulting in weak texture features in the annealed sheet with transverse-direction split (0001) poles.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Mechanical
Yinhui Zhang, Jian Shuai, Zhiyang Lv, Wei Ren, Tieyao Zhang
Summary: The effect of Luders plateau on the fracture response of pipeline steels was studied and a constraint-based fracture failure criterion considering the Luders plateau was proposed. The results showed that the length of Luders plateau had significant impact on the relationship between fracture toughness and constraint.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Mechanics
Jack Beswick, Peter James, Ben Pellereau
Summary: This paper presents a novel approach to defining parameters for deriving effective ductile tearing initiation toughness curves for various materials under low constraint conditions using finite element analysis. The curves are calculated by defining the loads at which specific areas of material ahead of the crack tip, in 2D Single Edge Notched Bend specimens, are enclosed by contours defined by a critical void size. The shape of the toughness curve is largely independent of the critical void size ratio and the high constraint toughness, providing confidence in the method.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Zhuheng Li, Fengjuan Chen
Summary: This paper validates a toughness-based crack initiation-propagation criterion using a modified fracture energy parameter in quasi-brittle materials through finite element analysis. It shows that the ratio of elastic energy has a significant influence on the value of fracture energy involved in the criterion.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Physics, Condensed Matter
Sanyukta Ghosh, Gyan Shankar, Anirudha Karati, Gerda Rogl, Peter Rogl, Ernst Bauer, B. S. Murty, Satyam Suwas, Ramesh Chandra Mallik
Summary: The combination of Ba-filling the voids and GaSb nanophase incorporation in Co4Sb12 matrix resulted in improved thermoelectric properties, mainly by reducing lattice thermal conductivity and enhancing scattering effect to enhance zT.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Nitish Bibhanshu, Gyan Shankar, Satyam Suwas
Summary: Hot deformation and softening response of titanium aluminide Ti-48Al-2V-0.2B were investigated, with microstructural changes observed at different strain rates and temperatures. Deformation in different phase fields led to various mechanisms, such as dynamic recrystallization and cavitation along grain boundaries at certain temperatures. These findings provide insights into the softening behavior of the alloy under different deformation conditions.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
B. Aashranth, Gyan Shankar, M. Arvinth Davinci, Dipti Samantaray, Utpal Borah, Satyam Suwas
Summary: The study found that the softening mechanisms in P91 martensitic steel during thermo-mechanical processing are mainly influenced by the interaction between microstructural strain, texture, and phase transformation, and the softening characteristics vary with the processing parameters.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Chemistry, Physical
Sanyukta Ghosh, Sahil Tippireddy, Gyan Shankar, Anirudha Karati, Gerda Rogl, Peter Rogl, Ernst Bauer, Sai Rama Krishna Malladi, B. S. Murty, Satyam Suwas, Ramesh Chandra Mallik
Summary: The lattice thermal conductivity of Co4Sb12-based materials was effectively reduced by filling suitable electropositive elements into the voids and forming nanocomposites, resulting in an enhanced thermoelectric efficiency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Madhusmita Behera, Ajit Panigrahi, Matthias Bonisch, Gyan Shankar, Pratima Kumari Mishra
Summary: A near-equiatomic TiTaNbMoZr refractory high entropy alloy (RHEA) was prepared by vacuum arc melting, and its structural stability and thermal expansion were investigated. The alloy exhibits structural stability up to 1173K and thermal stability up to 1000K.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
B. Aashranth, Gyan Shankar, Dipti Samantaray, Satyam Suwas
Summary: The dynamic transformation of austenite to ferrite in a 9%Cr alloy steel is investigated in this study. The study reveals the essential characteristics of the transformation, its driving force, and the influencing factors. It is found that stress-driven displacive transformation occurs, and the transformation can be controlled by strain rate.
Article
Materials Science, Multidisciplinary
Gyan Shankar, Vivek Kumar Singh, Aditya Chepuri, Balasubramian Vengatesan, Satyam Suwas
Summary: Spheroidization is a common technique used to improve the formability and machinability of materials. In the case of 22MnB5 steel, a combination of deformation levels and annealing times was employed to optimize the spheroidization process, determining that the best processing parameter was 20% cold rolling reduction followed by 20 hours of annealing.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
S. Arjun Sreedhar, Dhrubjyoti Baruah, Gyan Shankar, Satyam Suwas, R. Narasimhan
Summary: This study investigates the fracture behavior of AZ31 Mg alloy at different temperatures. Experimental results show that the fracture mechanism changes from brittle cracking to ductile void growth as temperature increases. Increased temperature also leads to increased twinning and texture changes in the far-edge of the ligament.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Materials Science, Multidisciplinary
Aman Gupta, Gyan Shankar, Diksha Mahadule, Rajesh Kisni Khatirkar
Summary: The microstructure, texture, and mechanical properties of heat-treated two-phase titanium alloy samples were investigated. Different heating temperatures and cooling rates resulted in variations in the volume fraction of different phases and texture intensity. The formation of martensite during oil quenching increased microhardness, while grain coarsening during furnace cooling decreased microhardness. The heating temperature and cooling rate also significantly affected the modulus of elasticity.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Dhrubjyoti Baruah, K. V. Vaishakh, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: The mixed-mode fracture behavior of fatigue pre-cracked AZ31 Mg alloy specimens is compared with pre-notched samples using optical imaging and digital image correlation. The fracture toughness is highest for mode I and decreases significantly with increasing mode II component. Additionally, the fracture toughness is 2-3 times higher for the pre-notched samples compared to the pre-cracked specimens. This is attributed to quasibrittle failure in the latter and a combination of ductile and brittle fracture surface features in the former. Profuse tensile twinning at the far-edge of the ligament is observed in the notched specimens, contributing to the toughness enhancement.
PHILOSOPHICAL MAGAZINE LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Dhrubjyoti Baruah, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: This study investigates the effect of temperature on the mixed-mode fracture response of a rolled AZ31 Mg alloy. Experimental results show that the fracture toughness Jc enhances by a factor of about 3.5, irrespective of mode mixity over the temperature range studied. The change in fracture mechanism from brittle cracking to ductile void growth and coalescence is observed as the temperature increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Gyan Shankar, Shuchi Sanandiya, Luis A. Barrales-Mora, Satyam Suwas
Summary: The effect of solid solution on the development of recrystallization microstructure and texture in FCC materials with unchanged SFE on alloying addition was examined. Pure Ni and Ni-Fe alloys with different Fe content were investigated. The addition of Fe led to differences in the recrystallization texture attributed to the highly heterogeneous deformed microstructure in the Ni-Fe system. Cu-oriented grains exhibited early recrystallization while deformed grains with orientation || ND showed slow recrystallization. The evolution of recrystallization texture and the role of different deformation features were investigated. Cellular automata simulation technique was used to simulate the recrystallization behavior and discuss experimental observations.
PHILOSOPHICAL MAGAZINE
(2023)
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.
