Article
Mechanics
Bulat N. Galimzyanov, Anatolii Mokshin
Summary: The porous titanium nickelide is characterized by unique physical and mechanical properties, and the degree of porosity affects its mechanical behavior under tension, compression, and shear. Different types of pore structures influence the elastic characteristics and resistance to tensile and shear, providing insights for developing and improving amorphous metal foams.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2021)
Article
Multidisciplinary Sciences
Lukasz Wargula, Dominik Wojtkowiak, Mateusz Kukla, Krzysztof Talaska
Summary: This study presents experimental research results on the mechanical properties of pine wood, focusing on the effects of moisture content and force direction. By developing a model using finite element analysis, the study aims to estimate the maximum destructive force of the material and design energy-efficient and durable grinding machines. The accuracy of the model in determining the maximum destructive force is around 8%, with an average coverage of about 77% for elastic-plastic deformations.
Article
Nanoscience & Nanotechnology
C. Y. Zhang, G. Yuan, Y. X. Zhang, C. Y. Liu, F. Fang, G. D. Wang, R. D. K. Misra
Summary: This study continuously prepared Cu-based amorphous alloy plates using twin-roll strip casting method, showed that the plates have good surface quality and shape, and demonstrated excellent bending and compression plasticity achieved through multiple shear bands.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Feilong Wang, Dawei Yin, Jingwang Lv, Shan Zhang, Mingzhen Ma, Xinyu Zhang, Riping Liu
Summary: This study investigated the effect of different cooling rates on the microstructure and compression deformation behavior of Zr41.2Ti13.8Cu12.5Ni10Be22.5 amorphous alloys, revealing the appearance of trace nanocrystals with decreased cooling rates and their impact on plasticity. The amount of free volume was found to mainly affect the plasticity of the amorphous alloy, while the elastic strain, yield strength, and compressive strength marginally changed with cooling rate, and plastic strain gradually increased. The study provides insights into how cooling rate influences the properties of amorphous alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Galina Abrosimova, Valentina Chirkova, Elena Pershina, Nikita Volkov, Ilia Sholin, Aleksandr Aronin
Summary: The effect of free volume on the crystallization process of an Al87Ni8Gd5 amorphous alloy has been investigated. It was found that the deformation of the amorphous alloy leads to the formation of shear bands, which contain an enhanced concentration of free volume. To retain this free volume, a refractory metal was coated on the surface of the amorphous alloy. X-ray diffraction and transmission electron microscopy methods were used to study the structure of the Al87Ni8Gd5 alloy with a protective Ta coating. It was found that the fraction of nanocrystalline phase formed in the amorphous samples with the protective coating was larger than that in the uncoated samples. The size of Al nanocrystals formed in both coated and uncoated samples was the same. The higher rate of crystal nucleation in the deformed amorphous samples with a protective coating is attributed to a higher diffusion coefficient resulting from an enhanced concentration of free volume.
Article
Nanoscience & Nanotechnology
J. T. Purstl, H. O. Jones, T. E. J. Edwards, R. P. Thompson, F. Di Gioacchino, N. G. Jones, W. J. Clegg
Summary: The study found that the statistical variations commonly observed in micro-compression tests may be frequently linked to systematic errors in stress measurements, and precise evaluation of deformation statistics can only be facilitated if the pillar deformation morphology is closely monitored.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yu Zhou, Yongchao Liang, Lili Zhou, Zean Tian, Qian Chen, Yunfei Mo
Summary: The effects of pore diameter and B2-NiTi crystal on the compressive deformation of Ni50Ti50 metallic glasses are studied by molecular dynamics simulation. The presence of pores inhibits stress reduction and induces the formation of high shear strain atoms and shear bands. Larger pore diameters result in lower yield strengths and increased plasticity. The B2-NiTi crystal reduces deformation and impedes the propagation of shear bands, leading to improved plasticity. These findings provide theoretical guidance for the development of metallic glasses with improved plasticity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Arfan Utiarahman, Ayad F. Alkaim, Aseel M. Aljeboree, Smirnova Zhanna Venediktovna, Cherney Olga Takhirovna, Markov Alexander, Yermek Abilmazhinov, Yu Zhu
Summary: In this study, Ce65Cu15Al10Ni8Co2 bulk metallic glass was annealed below the sub-Tg and then elastostatically and cryogenically loaded and treated. XRD analysis confirmed the amorphous nature of the alloys, while DSC was used to evaluate enthalpy variations and specific heat capacity. The results showed that the designed treatment procedure leads to the recovery of relaxation, with free volume generation and structural rearrangements playing a key role. Additionally, it was found that primary elastostatic loading facilitates the subsequent rejuvenation process during cryogenic cycling.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
J. Gordon, R. E. Lim, M. J. Wilkin, D. C. Pagan, R. A. Lebensohn, A. D. Rollett
Summary: This study investigates the micromechanical response of high-entropy alloys at the grain-scale using HEDM and crystal plasticity modeling, revealing discrepancies with classical predictions and providing a foundation for future research on these alloys.
Article
Materials Science, Multidisciplinary
Niuniu Wang, Hubin Luo, Lei Liu, Yong Ding, Renjie Chen, Xiangyu Zhang, Xiaohong Yao, Izabela Szlufarska, Aru Yan
Summary: Recently, it has been discovered that SmCo5 can form amorphous shear bands, leading to dislocation-free plastic deformation at large strains. The formation of shear bands is energetically favorable and does not induce high local stress compared to cracking. However, the atomic-level mechanism of the crystalline-to-amorphous transition during shear-band formation remains unclear. This paper investigates the shear deformation of SmCo5 through molecular dynamics simulations and explores the atomic packing in the interfacial zone between the crystal matrix and shear band to understand the behavior of shear-band formation.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Physics, Condensed Matter
K. Itoh, R. Yamada, J. Saida, K. Ikeda, T. Otomo
Summary: By investigating the structure of Cu67Zr33 amorphous alloy, it was found that there are tetrahedral and octahedral holes as well as other larger holes in the alloy, and the distribution of free volumes for these holes can be described by an exponential function. Furthermore, local structural fluctuations due to densely and loosely packed tetrahedral holes lead to negative free volume spaces.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Engineering, Mechanical
Jishnu J. Bhattacharyya, Sriramya Nair, Darren C. Pagan, Vahid Tari, Ricardo A. Lebensohn, Anthony D. Rollett, Sean R. Agnew
Summary: The study of the elastoplastic transition of a metastable 13-Ti alloy, Timetal-18, revealed that small crystallographic reorientations during the transition were insufficient to distinguish between candidate slip modes, and that hardening was primarily due to intergranular interactions. Examination of individual responses showed some grains exhibiting "strain softening," highlighting the importance of intragranular heterogeneity in future research.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
Zhuang Li, Zhilin Long, Shan Lei, Yulin Tang
Summary: Rational design of amorphous alloys from the viewpoint of elasticity can be achieved through machine learning methods to generate optimized elastic predictive models, which have been successfully verified and demonstrate the potential to accelerate composition screening and property optimization of amorphous alloys.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Wencong Zhang, Jinqi Pan, Songhui Wang, Jianlei Yang
Summary: This study investigates the microstructure evolution of the extruded Mg-6.03Zn-0.55Zr alloy during hot plane strain compression experiments. It is found that basal slip is the main deformation mechanism, while higher temperatures lead to the activation of non-basal slip, weakening the basal texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Z. Q. Chen, X. Chi, J. Z. Li, K. Men, P. Huang, F. Wang, B. A. Sun, H. B. Ke, W. H. Wang
Summary: In this study, the correlations between structural characteristics, STZ size, and shearband-mediated plasticity were investigated in CLCA NiW alloy films. The presence of NSBs positively impacted the STZ size obtained by the SRS method, while the statistically determined STZ size was not affected by NSBs. The findings of this study shed light on the underlying mechanism of STZ size discrepancy and its relationship with structural characteristics and plasticity of amorphous alloys.
Article
Materials Science, Multidisciplinary
Yakai Zhao, Jeong-Min Park, Jae-il Jang, Upadrasta Ramamurty
Summary: Spherical tip nanoindentation experiments on two typical face-centered cubic high-entropy alloys (HEAs) revealed a bimodal probability density distribution in the onset of incipient plasticity, with heterogeneous dislocation nucleation at lower stresses and homogeneous dislocation nucleation at higher stresses. High-temperature aging was found to enhance the alloy's strength by increasing the stress required for homogeneous dislocation nucleation.
Article
Materials Science, Multidisciplinary
Il-Hyun Kim, Myung-Ho Lee, Yang-Il Jung, Hyun-Gil Kim, Jae-Il Jang
Summary: The study investigated the behavior of dynamic strain aging (DSA) in a Zr-1.5Nb-0.4Sn-0.2Fe-0.1Cr alloy strip through tension tests at different temperature ranges, revealing a linear relationship between shear stress and test temperature, with the effect of strain rate on this linear relationship. The findings also showed variations in DSA effects between samples oriented in the rolling direction and transverse direction.
KOREAN JOURNAL OF METALS AND MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Wenrui Zhao, Jae-Kyung Han, Yulia O. Kuzminova, Stanislav A. Evlashin, Alexander P. Zhilyaev, Alexander M. Pesin, Jae-il Jang, Klaus-Dieter Liss, Megumi Kawasaki
Summary: The study highlights the significance of grain refinement achieved through high-pressure torsion on the mechanical properties and structure of AM CoCrFeNi HEA, demonstrating high strain hardening capability and increased plasticity in the nanostructured HEA, with structural evolution showing decreasing crystallite size, increasing microstrain, and expanding lattice parameter. This provides advantages of nanostructuring for current developments in the AM technology of HEAs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yeonju Oh, Won-Seok Ko, Nojun Kwak, Jae-il Jang, Takahito Ohmura, Heung Nam Han
Summary: This study utilizes small-scale techniques to comprehensively investigate the ductile-to-brittle transition (BDT) behavior of pure tungsten. By proposing a practical fracture analysis diagram and conducting high temperature nano-indentation tests and atomistic simulations, the inherent mechanical properties and fracture behaviors of tungsten are studied. The results demonstrate the significant relevance between small-scale mechanical properties and macroscopic BDT behavior in pure tungsten.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jae-Hwan Kim, Young-Hwan Lee, Jun-Hyoung Park, Byeong-Joo Lee, Young-Woon Byeon, Jae-Chul Lee
Summary: Research shows that in the Na-Sn battery system, the generation of high-density dislocations in crystalline Sn relieves the residual stresses near the interface, facilitating the ultrafast diffusion of sodium into the Sn crystal and improving battery performance. Combining multi-scale simulations and molecular dynamics can help explain the structural origins of these ultrafast diffusion rates.
Article
Engineering, Electrical & Electronic
Dong-hun Lee, Jae-il Jang, Young-Ho Kim
Summary: In this study, Au-20wt%Sn solder joints were fabricated using thermo-compression bonding, and the microstructure and shear strength of the solder joints were investigated. The results showed that the joining temperature and time significantly affected the shear strength of the solder joints.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Zhe Gao, Yakai Zhao, Jeong-Min Park, A-Hyun Jeon, Kotaro Murakami, Shin-ichi Komazaki, Koichi Tsuchiya, Upadrasta Ramamurty, Jae-il Jang
Summary: This study compared the effects of hydrogen on the thermal desorption and nanoindentation responses of nanocrystalline dual-phase alloys and coarse-grained alloys, showing that the FCC phase is more susceptible to hydrogen-induced hardening than the BCC phase. However, this difference is negated in the nanocrystalline samples.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Dong-Hyun Lee, Zhe Gao, Jeong-Min Park, Yakai Zhao, Jin-Yoo Suh, Eric A. Jagle, Koichi Tsuchiya, Upadrasta Ramamurty, Jae-il Jang
Summary: The significant strengthening of SLM 304L stainless steel after high-pressure torsion treatment is mainly attributed to the synergistic combination of grain refinement and martensitic transformation. In the nanocrystalline regime, the dominance of grain boundary-mediated plasticity retards martensite-induced hardening.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Youngin Lee, Young-Hoon Kim, Jae-Hyun An, Jae-Chul Lee
Summary: This study explores the collective effects of crystal structure, temperature, and electric field on the ionic conductivity of various electrolytes. The results show that abundant stable Li interstitial sites in the crystals shorten the jumping distance for Li self-diffusion, while charge polarization of the P2S7 cluster widens the Li diffusion passage. These findings fill the knowledge gaps regarding the ionic conduction mechanisms and provide design criteria for developing highly conductive solid electrolytes.
Article
Materials Science, Multidisciplinary
Min-Su Jo, Young-Hee Cho, Jung-Moo Lee, Soo-Bae Kim, Su-Hyeon Kim, Jae-il Jang
Summary: The present investigation examined the influence of volume fraction and interconnectivity of hard phases on the elevated temperature strength of multicomponent Al-Si-Cu-Ni alloys. The microstructural features, such as the size and aspect ratio of each phase, changed with ultrasonic melt treatment and cooling rate, affecting the elevated temperature strength at 350 degrees C. Based on a hexagonal shear-lag model, the influence of microstructural factors on the elevated temperature strength was discussed.
KOREAN JOURNAL OF METALS AND MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Siyuan Wei, Yakai Zhao, Jae-il Jang, Upadrasta Ramamurty
Summary: This study focuses on the role of microstructural interfaces, especially twin boundaries, on the strain-rate sensitivity of high-entropy alloys. The experimental results show that the strain-rate sensitivity, yield strength, and plastic flow behavior in single crystals are orientation dependent due to the differences in crystallographic orientations. The presence of twin boundaries leads to distinct mechanical responses.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Young-Hoon Kim, Jae-Hyun An, Xiangmei Li, Joo-Yeon Moon, Hooam Yu, Hyo-Jun Ahn, Jae-Chul Lee
Summary: The coalescence of metal nanoparticles in colloidal solutions is a widespread phenomenon. A method is developed based on this behavior to transform microsized metals into nanoporous structures. The selection criteria for solvents and counterpart metals for generating nanoporous structures are derived from acid-base reactions theory and density functional theory. The anodes prepared using this method for Na-ion batteries exhibit high capacity and long cycling lifetimes. This study provides a fundamental framework for selecting solvents to produce low-cost anodes with large capacities for various functional materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Hyeon-Woo Son, Ji-Young Lee, Young -Hee Cho, Jae-il Jang, Soo-Bae Kim, Jung-Moo Lee
Summary: This study investigated the effects of melt-holding temperatures on the mechanical properties and T5 age-hardening behavior of Al-Si-Cu-Mg alloys. Increasing the melt-holding temperature from 720°C to 820°C simultaneously enhanced the yield strength, tensile strength, and elongation. The improved mechanical properties of the alloy with high melt-holding temperature were attributed to microstructural changes, including microstructure refinement and accelerated precipitation kinetics. The high melt-holding temperature also changed the solute distribution and accelerated the segregation behavior of Cu on the Si precipitates, resulting in refined precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Taejun Ha, June-Hyung Kim, Changhyo Sun, Dong-Ik Kim, Jin-Yoo Suh, Jae-il Jang, Joonho Lee, Yunseok Kim, Jae-Hyeok Shim
Summary: The effect of Ce addition on the initial hydrogen absorption behavior and microstructural features of AB-type Ti50Fe48V2 hydrogen storage alloys was investigated. Ce addition significantly improved the initial hydrogen absorption kinetics at room temperature, with no significant influence on the pressure-composition isotherms. Fine spherical particles containing Ce were dispersed in the TiFe matrix, and these particles were determined to be gamma-Ce mixed with cerium oxide. Ce particles played a crucial role by providing starting points for initial hydrogenation, explaining the significant increase in primary hydrogen absorption kinetics after Ce addition.
Article
Materials Science, Multidisciplinary
Priyanka Saini, Shankha Nag, Jae-il Jang, In-Chul Choi, Upadrasta Ramamurty, R. L. Narayan
Summary: Statistical analysis is often conducted to understand the micromechanisms of plasticity by analyzing the shear stresses at which the first 'pop-ins' occur during nano-indentation. This study focuses on the second 'pop-in' stress and finds that the 3-parameter Weibull distribution is the best descriptor for its stochasticity. The study also provides insight into the development of plasticity in bulk metallic glasses during nano-indentation.
