Article
Nanoscience & Nanotechnology
Kai Yao, Shewei Xin, Yi Yang, Yu Du, Jincai Dai, Ting Li, Xiaohua Min
Summary: The tensile behavior of metastable beta-type Ti-15Mo alloy with {332}<113> twinning-induced plasticity (TWIP) effect was investigated at 20K. It was found that the alloy exhibited ultrahigh strength and excellent elongation, making it a major advancement for cryogenic applications. The serrated tensile curve and multiple necking observed were attributed to the formation of twins. The presence of abundant {332}<113> twins and piled-up dislocations at twin boundaries hindered local plastic deformation and necking, resulting in simultaneous enhancement of strength and ductility. Exploiting the {332}<113> TWIP effect in body-centered cubic (BCC) structured titanium alloys is a novel strategy for cryogenic alloy development.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Tangqing Cao, Qian Zhang, Liang Wang, Lu Wang, Yao Xiao, Jiahao Yao, Huaiyi Liu, Yang Ren, Jun Liang, Yunfei Xue, Xiaoyan Li
Summary: High-entropy alloys (HEAs) possess unique microstructures and chemical compositions, resulting in remarkable mechanical properties. In this study, the mechanical behaviors and deformation mechanisms of CoCrFeNi HEAs under dynamic loading were investigated through experiments and simulations. The results showed significant strain rate sensitivity and strain-hardening capability of CoCrFeNi HEAs at high strain rates. The findings shed light on the design and fabrication of HEAs with excellent dynamic mechanical properties.
Article
Nanoscience & Nanotechnology
Jongun Moon, Olivier Bouaziz, Hyoung Seop Kim, Yuri Estrin
Summary: Deformation-induced twinning was used as a strengthening mechanism in a thermomechanical treatment for a high-entropy alloy, resulting in improved mechanical properties, especially in strain hardening ability, at room temperature.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Jongun Moon, Olivier Bouaziz, Hyoung Seop Kim, Yuri Estrin
Summary: By utilizing low-temperature pre-straining and subsequent annealing, the mechanical properties of CoCrFeMnNi high-entropy alloy were improved, confirming the effectiveness of twinning engineering concept.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Manufacturing
Dylan Agius, Chris Wallbrink, Kyriakos Kourousis
Summary: The design freedom provided by Additive Manufacture (AM) technologies is driving innovation in new directions, but also creating challenges in material characterisation. This paper proposes a model that combines anisotropic yield function with nonlinear multicomponent kinematic hardening rule to accurately simulate the anisotropic behavior of materials like Ti-6Al-4V alloy. The model's performance was evaluated through simulations and showed good agreement with experimental data, demonstrating its efficiency in modeling cyclic stress-strain evolution in different build orientations.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Ning Guo, Bingtao Tang, Jiyuan Liu, Zongan Luo
Summary: The stepwise strain hardening behavior of copper single crystals is influenced by the competition and collaboration between dislocation slip and deformation twinning. A crystal plasticity-based model is proposed to study the strain hardening characteristics associated with slip and twinning interactions, providing insight into the evolution of hardening mechanisms. By incorporating accumulated twin volume fraction and investigating the effects of crystal orientation and twinning, a deeper understanding of stress fluctuation and large plastic deformation evolution can be achieved.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Engineering, Mechanical
Tongqi Wen, Anwen Liu, Rui Wang, Linfeng Zhang, Jian Han, Han Wang, David J. Srolovitz, Zhaoxuan Wu
Summary: This study determines the properties of dislocation cores, twins, and cracks in HCP and BCC Ti using Deep Potential (DP), DFT, and linear elastic fracture mechanics. It provides insights into the behavior of slip dislocations and the brittleness of cracks on basal planes, as well as the energy and structure of twin boundaries. The results offer a comprehensive understanding of Ti plasticity and fracture.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Mechanics
Philip Crone, Peter Gudmundson, Jonas Faleskog
Summary: This paper introduces an analytical model based on an isotropic strain gradient plasticity theory to describe work hardening in a metal reinforced by non shearable particles during cyclic straining. The model is validated against finite element solutions and shows excellent agreement. The model also includes contributions from higher order stresses in both bulk and particle/matrix interfaces. The influence of a quadratic interface free energy on inflections in the reverse stress-strain curve is investigated, suggesting its physical relevance for low plastic strains.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Joong-Ki Hwang
Summary: This study compares the deformation behaviors of pearlitic, ferritic, and TWIP steels and reveals that the high strength and strain hardening rate of TWIP steel are strongly related to twinning behavior. Compared with other steels, the strain hardening rate of TWIP steel is more closely related to twinning behavior, and the drawn TWIP steel wire exhibits a higher twinning rate.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Metallurgy & Metallurgical Engineering
Ming-jie Qin, Xi Jin, Min Zhang, Hui-jun Yang, Jun-wei Qiao
Summary: The Fe50Mn20Cr20Ni10 medium entropy alloy exhibits high tensile strength, ductility, and strain hardening capacity, deforming plastically through dislocations and twins. Twin boundaries associated with deformation twinning impede dislocation motion, enhancing the alloy's strain hardening capacity. This study provides insights into Fe-MEAs and suggests a potential direction for future development of high entropy alloys and MEAs.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Leonardo Shoji Aota, Isnaldi R. Souza Filho, Moritz Roscher, Dirk Ponge, Hugo Ricardo Zschommler Sandim
Summary: This study reports a novel approach based on strain hardening engineering in a laser powder-bed fusion (LPBF) 304L stainless steel. The results show that strain hardening engineering through grain size control can trigger hierarchical deformation in different grain families, leading to high-strength and ductile alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xiaoqian Guo, Chao Ma, Lingyu Zhao, Adrien Chapuis, Qing Liu, Peidong Wu
Summary: Wrought magnesium and Mg alloys exhibit strong basal texture and various slip and twin modes at room temperature, which interact with each other and are modeled empirically via latent hardening coupling coefficients. The activation of {1012} tension twinning can lead to severe mechanical anisotropy and texture change, influenced by slip-induced dislocations. Experiments and simulations show that latent hardening by slip modes for {1012} twinning is much less than self-hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Philip Crone, Tao Zhou, Peter Hedstrom, Joakim Odqvist, Peter Gudmundson, Jonas Faleskog
Summary: An analytical flow stress model based on isotropic strain gradient plasticity theory is proposed and evaluated for precipitation hardened materials. The model successfully captures the experimental data of a 15-5 PH stainless steel, demonstrating its potential as an alternative to traditional work hardening models.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Tak Min Park, Mun Sik Jeong, Chanwon Jung, Won Seok Choi, Pyuck-Pa Choi, Jeongho Han
Summary: By adding a micro-alloying element and forming precipitates, the steel exhibits higher strength without sacrificing ductility compared to steel without precipitates. The formation of precipitates changes the microstructure of the steel and enhances the strain hardening rate, leading to higher tensile strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
T. W. J. Kwok, P. Gong, X. Xu, J. Nutter, W. M. Rainforth, D. Dye
Summary: The study found that cold rolling of the novel medium manganese steel led to an increase in strain hardening rate without a significant drop in ductility during subsequent tensile tests. Additional twinning systems activated by cold rolling provided potent nucleation sites for strain induced martensite, resulting in an enhanced TRIP effect.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
T. W. J. Kwok, C. Slater, X. Xu, C. Davis, D. Dye
Summary: By investigating two ingots with different cooling rates, the study revealed the effects of cooling rate on Mn segregation range and delta-ferrite transformation, and after thermomechanical processing, the transformation of delta-ferrite was found to impact the properties of the final product.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Guohua Zhao, Xin Xu, David Dye, Pedro E. J. Rivera-Diaz-del-Castillo, Nik Petrinic
Summary: This study reported a method to deploy transformation-mediated strengthening in titanium alloys by supervised activation of TRIP and TWIP through mechanism-driven modelling, improving the mechanical properties of materials. By developing new alloys, notable resistance to strain localization was achieved, along with significant strain-hardening effects.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Hossein Eskandari Sabzi, Xiao-Hui Li, Chi Zhang, Hanwei Fu, David San-Martin, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: Nanotwin formation in austenitic stainless steels during laser powder bed fusion (LPBF) was observed, with the nature of such twins revealed using transmission electron microscopy. Dynamic recrystallization (DRX) was activated and induced by deformation nanotwins in LPBF. A thermostatistical model was proposed, validated, and offers a method for microstructurally engineering austenitic stainless steels for applications requiring high strength and ductility.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Vassili A. Vorontsov, Thomas P. McAuliffe, Mark C. Hardy, David Dye, Ioannis Bantounas
Summary: The tensile creep performance of a polycrystalline Co/Ni-base superalloy with a multimodal gamma' distribution was studied at 800 degrees C and 300 MPa. The rupture life of the alloy was comparable to that of RR1000 tested under similar conditions. Microstructural examination revealed the presence of continuous gamma' precipitates and M23C6 carbides along the grain boundaries, as well as the coarsening of the secondary gamma' precipitates. Long planar deformation bands, identified as microtwins, were observed along with the depletion of gamma' stabilising elements. The mechanism for precipitate dissolution was suggested to be the Kolbe reordering mechanism.
Article
Engineering, Mechanical
X. Z. Liang, P. E. J. Rivera-Diaz-del-Castillo
Summary: This study investigates the influence of hydrogen on microstructural alterations in components subjected to rolling contact fatigue (RCF). A dislocation-assisted carbon migration model is developed to describe the formation of hydrogen-influenced microstructural alterations. The experimental results confirm the effectiveness of the model.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Jianwei Zhao, Quan Yang, Hossein Eskandari Sabzi, Wei Wen, Pedro E. J. Rivera-Diaz-del-Castillo
Summary: Stress relaxation after hot deformation is modeled by considering various physical phenomena, including dislocation recovery, recrystallization, and precipitation. The model incorporates new formulations, such as a vacancy-mediated dislocation climb approach for dislocation recovery. The softening behavior of 6 microalloyed steel grades is tracked and compared with experimental data. The approach is also discussed for its application in additive manufacturing microstructural relaxation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
X. Xu, T. W. J. Kwok, P. Gong, D. Dye
Summary: The novel concept of varying the strain hardening rate of medium Mn steel by adjusting the intercritical annealing duration was explored, revealing a relationship between austenite stability and strain hardening rate. The continuous Mn enrichment with increasing intercritical annealing duration was found to be the cause of the change in austenite stability. Twinned martensite was identified as the likely product of martensitic transformation during deformation.
Article
Crystallography
Ye Yuan, Sui Yuan, Yifei Wang, Qikang Li, Zize Deng, Yinsong Xie, Yubin Ke, Jian Xu, Hongying Yu, Dongbai Sun, Xin Xu
Summary: The effect of phase separation (PS) on the super duplex stainless steel SAF 2507 was investigated. The nanostructure, mechanical properties, and corrosion resistance of the alloy were studied after aging at 500 degrees C for different time durations. The early stage of PS had a significant impact on the nanostructure and properties of SAF 2507. The pitting corrosion resistance of SAF 2507 decreased with the progression of PS due to Cr depletion caused by PS. The evolution of the passivation region correlated well with the mechanical properties and characteristic parameters of PS, suggesting the potential for a new nondestructive electrochemical method to quantify the progression of PS in SAF 2507.
Review
Materials Science, Multidisciplinary
T. W. J. Kwok, D. Dye
Summary: Medium Mn steels are emerging third-generation advanced high-strength steels with high strengths, large ductilities, and lower costs compared to their predecessor high Mn TWIP steels. They exhibit TWIP and/or TRIP effects, which contribute to a high strain hardening rate. The current review focuses on the alloy design, processing, microstructure, and property relationships of medium Mn steels, complementing the review by Sun et al. [Physical metallurgy of medium-Mn advanced high-strength steels, Int Mater Rev. 2023.], which primarily discusses phase interfaces and thermodynamics.
INTERNATIONAL MATERIALS REVIEWS
(2023)
Article
Chemistry, Physical
Abdollah Bahador, Astuty Amrin, Shota Kariya, Ammarueda Issariyapat, Ozkan Gokcekaya, Guohua Zhao, Junko Umeda, Yafeng Yang, Ma Qian, Katsuyoshi Kondoh
Summary: This research investigates the effect of adding rhenium (Re) on the microstructure and strengthening mechanisms in titanium alloys. The results demonstrate that Re addition can significantly enhance the strength and ductility of titanium alloys, providing valuable insights for the development of high-performance structural materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(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.
