Article
Materials Science, Multidisciplinary
Jing Zhou, Siyi Di, Baoan Sun, Qiaoshi Zeng, Baolong Shen
Summary: This study investigates the correlation between the deformation behavior and atomic-scale heterogeneity of Fe-based BMGs. It is found that as plasticity increases, the serrated flow dynamics of Fe-based BMGs transform from chaotic state to self-organized critical state. The increase in atomic-scale heterogeneity facilitates a higher frequency of interaction and multiplication of shear bands, resulting in a brittle to ductile transition in Fe-based BMGs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
W. H. Zhou, N. T. Panagiotopoulos, A. L. Greer, Y. Li
Summary: A rejuvenated Zr-based bulk metallic glass was tested in tension and exhibited strain-hardening behavior. The plastic strain at failure reached 0.9%, which is considered high for metallic glasses. Comparisons with other alloys showed that the hardening rate of the metallic glass decreases rapidly with increasing strain, limiting its tensile plastic strain to approximately 1%. Rejuvenation delayed early catastrophic failure and resulted in changes in the fracture surface morphology.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: This study investigates the embrittlement of a beta-Ti dendrite reinforced Zr-based bulk metallic glass composite (BMGC) when cast in a large size, and examines the effectiveness of cryothermal cycling (CTC) treatment in restoring the mode I fracture toughness. The plasticity of CTC treated BMGC is estimated through nanoindentation tests and differential scanning calorimetry (DSC), and validated through compression tests. The study reveals that both as-cast embrittled BMGC and CTC treated BMGC exhibit brittleness, with 5 times lower notch toughness compared to their tougher counterpart. The absence of notch-tip plasticity in the CTC treated BMGC, despite indications of plasticity in nanoindentation and higher enthalpy of relaxation (Delta H-rel), is explained through reassessing the origin of pop-ins in nanoindentation tests and variations in chemical and topological short range ordering during CTC. The implications of these results for improving the fracture toughness of structurally relaxed BMGCs using CTC are discussed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
S. Y. Zhang, W. H. Zhou, L. J. Song, J. T. Huo, J. H. Yao, J. Q. Wang, Y. Li
Summary: The mechanical properties of amorphous materials are closely related to their energy states. A higher energy state corresponds to larger plasticity and lower hardness. In this study, the correlation between the enthalpy and hardness of rejuvenated Au-based metallic glasses was explored. It was found that a rejuvenated metallic glass with a high-energy state showed a different trend in hardness variation, with hardness increasing instead of decreasing with increasing enthalpy when the enthalpy was higher than an intermediate value. The reactivations of 13- and alpha-relaxation both contributed to an increase in enthalpy but had opposite effects on hardness. This study provides new insights into designing metallic glasses with excellent mechanical properties by rejuvenating relaxed metallic glasses through the farthest reactivation of 13-relaxation and avoiding reactivation of alpha-relaxation.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Tianding Xu, Xiao-Dong Wang, Eric M. Dufresne, Yang Ren, Qingping Cao, Dongxian Zhang, Jian-Zhong Jiang
Summary: Anomalous fast atomic dynamics were discovered in a metallic glass with good glass forming ability, mainly attributed to the increased mobility of Cu atoms by Ag addition, leading to the formation of structural heterogeneity at the atomic level.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Shengjun Sun, Pengfei Guan
Summary: Computational simulation reveals that the local structure of metallic glass systems is not affected by system size, but dynamic properties show significant finite-size effects. When the system contains less than approximately 2000 atoms, there is a decoupling between local structure and relaxation dynamics, but a collapse can be observed between structural relaxation time and dynamic heterogeneity across different sized systems throughout the investigation.
SCIENCE CHINA-MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhiyuan Huang, Jianan Fu, Xin Li, Wenxin Wen, Hongji Lin, Yan Lou, Feng Luo, Zhenxuan Zhang, Xiong Liang, Jiang Ma
Summary: This study presents a method of ultrasonic-assisted rapid cold welding of metallic glasses without using any additives, achieving stable bonding of MG interface under high-frequency ultrasonic vibration, low temperature and low stress conditions. The ultrasonic technology accelerates atomic diffusion process, enabling rapid bonding of different compositions of MGs and potential for tuning new materials with new performance.
SCIENCE CHINA-MATERIALS
(2022)
Article
Materials Science, Ceramics
Tuo Wang, Yulong Zhou, Lianshun Zhang
Summary: The correlation between the annealing time and the plasticity, chemical fluctuation and structure change of a (Zr65Cu20Fe5Al10)94Nb6 bulk metallic glass (BMG) has been studied. The research shows that the plasticity initially increases and then decreases with increasing isothermal annealing time. After 30 min of annealing, the plasticity of the (Zr65Cu20Fe5Al10)94Nb6 BMG can reach 17.3%. The as-cast (Zr65Cu20Fe5Al10)94Nb6 BMG has a homogeneous structure and chemical composition, with short-range icosahedral clusters being the main structure. However, after annealing, there is chemical heterogeneity in the Cu-rich area, and various medium-range clusters can be found in the annealed (Zr65Cu20Fe5Al10)94Nb6 BMG.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
Jing Zhou, Si-Yi Di, Bao-An Sun, Rui Zhao, Qiao-Shi Zeng, Jian-Guo Wang, Zhen-Zhong Sun, Wei-Hua Wang, Bao-Long Shen
Summary: This study reveals a distinct fl-relaxation behavior and excellent plasticity in FeNi-based BMGs, which is attributed to the structural heterogeneity playing a key role in their dynamics, leading to a large amount of loosely packed regions. The pronounced fl-relaxation is also found to have a good correlation with the plasticity for the FeNi-based BMGs, providing potential guidance for the development of plastic BMGs from an atomic structural and glass dynamic perspective.
Article
Materials Science, Multidisciplinary
J. P. Wu, Y. Lin, F. H. Duan, Q. Chen, H. T. Wang, N. Li, J. L. Wen, J. Pan, L. Liu
Summary: Rejuvenation provides an alternative avenue to explore the relationship between property and microstructures of metallic glasses (MGs). This study experimentally examines the creep behavior of Zr69.5Cu12Ni11Al7.5 MGs by controlling the energy state through structural rejuvenation and thermal annealing. The findings reveal that the annealed MG at a lower energy state exhibits higher hardness, smaller displacement, and lower creep rate, while the rejuvenated MG at a high energy state displays lower hardness and increased free volume content but demonstrates superior creep resistance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Mechanical
K. Tao, F. C. Li, Y. H. Liu, E. Pineda, K. K. Song, J. C. Qiao
Summary: Understanding the microstructural heterogeneity of metallic glasses is crucial for understanding their physical and mechanical properties. Through structural relaxation and cold rolling, the state of metallic glasses can be modified, thereby altering their microstructural heterogeneity. The study shows that enhancing microstructural heterogeneity plays a significant role in tailoring the mechanical behavior of metallic glasses.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Shu Wen, Cuiying Dai, Weiguo Mao, Yang Zhao, Guofeng Han, Xiaoming Wang
Summary: The influences of Ag and Co additions on the thermal stability and glass-forming abilities of the alloys were systematically investigated. The mechanical performances were evaluated, and the plasticization mechanisms were discussed based on observations. The (Cu43Zr47Al7Ag3)(99.5)Co-0.5 bulk metallic glass exhibited excellent thermal stability and improved plasticity after compression tests.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Ceramics
Qi Qiao, Zhengqing Cai, Ji Wang, Zijing Li, Shidong Feng, Zhen-Qiang Song, Li-Min Wang
Summary: The effects of adding niobium (Nb) on the glass-forming ability and mechanical properties of (Zr40Ti40Ni20)72Be28 bulk metallic glasses (BMGs) alloy system were studied. The addition of appropriate amounts of Nb weakens, then enhances the glass-forming ability of the alloy system and improves its thermal stability. Mechanical tests show that the addition of Nb enhances the room-temperature plasticity of the alloys, with a significant increase in compression deformation.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Tuo Wang, Lianshun Zhang, Qiqi Hou, Qi Hao, Jichao Qiao
Summary: The plasticity of Fe75Mo5P13C7 BMG can be improved by annealing at low temperature due to nano-crystallization and remaining free volume. The correlation of plasticity with micro-structure, relaxation, and free volume characteristic varies in Fe75Mo5P13C7 BMG with its annealed state under different temperatures. The plasticity will be largest when the ratio of nanocrystals is equivalent to the free volume.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
C. F. Ma, P. Huang, F. Wang
Summary: The study evaluated the effects of positive and negative flow unit sizes on strain rate sensitivity (SRS) by altering the microstructural features of magnetron sputtering CuZr MG, showing that the sizes of flow units play crucial roles in determining the magnitude of SRS.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Majid Samavatian, Reza Gholamipour, Ahmad Ali Amadeh, Shamsoddin Mirdamadi
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2019)
Article
Metallurgy & Metallurgical Engineering
Hamid Reza Asgari Bidhendi, Reza Gholamipour, Farzad Shahri
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2019)
Article
Materials Science, Multidisciplinary
Majid Samavatian, Reza Gholamipour, Vahid Samavatian, Fahimeh Farahani
MATERIALS RESEARCH EXPRESS
(2019)
Article
Metallurgy & Metallurgical Engineering
Maryam Amiri Farsani, Reza Gholamipour
INTERNATIONAL JOURNAL OF METALCASTING
(2020)
Article
Materials Science, Multidisciplinary
Sobhan Mohammadi Fathabad, Farzad Shahri, Reza Gholamipour
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Chemistry, Physical
D. Kokabi, A. Kaflou, R. Gholamipour, M. Pouranvari
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Physics, Condensed Matter
Majid Samavatian, Reza Gholamipour, Ahmad Ali Amadeh, Vahid Samavatian
PHYSICA B-CONDENSED MATTER
(2020)
Article
Materials Science, Multidisciplinary
Majid Samavatian, Reza Gholamipour, Vahid Samavatian
Summary: In this study, a correlation-based neural network approach was developed to design potential new bulk metallic glasses by predicting alloy compositions and properties. The effects of microalloying on glass forming possibility were investigated and a quaternary system, ZrCoAlNi, with extended high glass forming possibility area, was predicted. The established framework offers a roadmap for potential applications in the development of new quaternary bulk metallic glass alloys.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Materials Science, Ceramics
Sajad Sohrabi, Reza Gholamipour
Summary: The addition of a small amount of Nb in the metallic glass samples studied resulted in a lower crystallization activation energy, indicating that Nb microalloying makes crystallization transformation easier. Moreover, the Nb minor addition delayed the onset of crystallization but accelerated the crystallization progress, resulting in a narrower crystallization transformation region. Additionally, the Avrami exponents for both non-isothermal and isothermal conditions were higher in the Nb-containing sample, indicating increased nucleation rates in this glassy alloy.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Morteza Mahmoodan, Reza Gholamipour, Sajad Sohrabi
Summary: The study investigated the effect of Nb addition on mechanical behavior and glass formation in bulk metallic glasses. Addition of 2% Nb improved glass forming ability and plasticity, while 4% Nb deteriorated these properties. The findings highlight the importance of minor alloying elements in the formation and mechanical properties of bulk metallic glasses.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2021)
Article
Materials Science, Multidisciplinary
Hamed Kaypour, Said Nategh, Reza Gholamipour, Alireza Khodabandeh
Summary: The crystal structure of AlxMnCrCoFeNi alloys was determined to be FCC solid solution or ordered B2 precipitates, with twins playing a role in the deformation mechanism.
Through hot compression tests, the constitutive equation of the alloy, the relationship between work hardening rate and dislocation annihilation coefficients, and the effect of Al addition on initiation temperature of necklace structure were confirmed.
The addition of Al not only increased the initiation temperature of necklace structure, but also indicated the presence of twin deformation mechanism in the alloy.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Ceramics
Majid Samavatian, Reza Gholamipour, Dmitry Olegovich Bokov, Wanich Suksatan, Vahid Samavatian, Morteza Mahmoodan
Summary: In this study, a machine learning model was developed to predict the energy dissipation distribution on the surface of metallic glasses. It was found that high, low, and moderate energy regions exhibit different behavior patterns.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Nanoscience & Nanotechnology
Elham Mohagheghpour, Marjan Rajabi, Reza Gholamipour, Sakineh Hosseinabadi
Summary: This study investigated the growth kinetics and optical properties of amorphous carbon (a-C) nanolayers deposited on glass substrates using ion beam sputtering deposition technique. The results showed that the surface roughness of thin films follows a fractal scaling law, and the growth process obeys the rules of the Wolf-Villain model. Additionally, it was observed that the optical band gap decreases with reducing surface roughness during thin film growth.
INTERNATIONAL JOURNAL OF NANO DIMENSION
(2021)
Article
Engineering, Multidisciplinary
E. Mohagheghpour, M. M. Larijani, M. Rajabi, R. Gholamipour
Summary: The study demonstrates that deposition of silver particles on DLC films can enhance the wettability and reflectivity performance, reduce surface free energy, while maintaining optical transmittance.
INTERNATIONAL JOURNAL OF ENGINEERING
(2021)