Article
Materials Science, Multidisciplinary
Sudhanshu Nahata, Marzyeh Moradi, Yoosuf N. Picard, Nithyanand Kota, O. Burak Ozdoganlar
Summary: Mechanical removal of metal leads to deformation, grain refinement, and lattice rotation beneath machined surfaces, varying significantly depending on the initial material's crystallographic orientation. Based on cutting force measurements, orientations can be categorized as hard or soft, with hard orientations exhibiting strain hardening and soft orientations showing shear bands and lattice rotations caused by cutting forces.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Li Liu, Bo Zhang, Jian-tang Jiang, Wen-zhu Shao, Liang Zhen
Summary: The formation and evolution of twin-induced adiabatic shear bands (ASBs) in a Mg-Al-Mn alloy under ballistic impact were studied. Localized shear deformation occurred at the twin boundaries, resulting in the formation of ASBs. The ASBs thicken with increasing plastic deformation, mainly composed of subgrains, ultra-fine recrystallized grains, and Mg17Al12 precipitates. The appearance of the twin-induced ASBs is mainly attributed to the twin-twin intersections caused by high strain rate deformation.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Zhicheng Zhu, Zhiyong Chen, Renke Wang, Chuming Liu
Summary: The mechanical behavior and microstructure characteristics of pure titanium with hat-shaped specimens under quasi-static and dynamic loading were investigated and compared. The study found that dynamic specimens exhibited higher yield stress and peak stress compared to quasi-static specimens. Microstructure characterization revealed different localized deformation mechanisms in the two types of specimens, with quasi-static specimens showing a wide shear localization region mainly composed of elongated twin structures, while dynamic specimens exhibited an ASB region consisting of ultrafine equiaxed grains resulting from rotational dynamic recrystallization. The study also observed different types of primary twins and multiple generations of twins in both types of specimens. The microhardness of the shear localization region in quasi-static specimens and the ASB region in dynamic specimens were found to be higher due to strain hardening and ultrafine-grained strengthening, respectively. Microtexture analysis revealed different orientation relationships between grains and local shear planes in the two types of specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Rafal Schmidt, Blazej Skoczen, Jan Bielski, Elwira Schmidt
Summary: In ductile materials strained near absolute zero, the formation of adiabatic shear bands is closely related to the intermittent plastic flow, which is a result of nonlinear hardening due to phase transformation. A new double surface model has been developed to study and explain the mechanisms and propagation of shear bands.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jinqi Pan, Wencong Zhang, Jianlei Yang, Songhui Wang, Xiaoyu Wang, Liqiang Zhan, Wenzhen Chen
Summary: In this study, the microstructural characterization and mechanical behavior of the extruded ZK61 alloy under dynamic and quasi-static loading at 623 K were investigated. It was found that an adiabatic shear band (ASB) composed of ultra-fine grains was formed under dynamic loading, while shear deformation occurred in an area with equiaxed grains under quasi-static loading. The stress-strain curve of dynamic loading showed high yield stress and long working-hardening stage, while the strain-hardening and thermal-softening in quasi-static curves reached a dynamic balance.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Multidisciplinary
Khushi Ram, Kartikeya Kartikeya, Puneet Mahajan, Naresh Bhatnagar
Summary: Shock tube experiments and quasi-static testing were conducted to investigate the dynamic behavior of UHH steel and Aluminium sheets under different peak-over pressures. Results showed that UHH steel exhibited negligible deformation at low pressures and sudden failure at high pressures, while Al sheets showed ductile deformation at all pressures. Hardness and ductility are required to dissipate supersonic shock waves.
DEFENCE TECHNOLOGY
(2023)
Review
Chemistry, Physical
Aman Gupta, Rajesh Khatirkar, Jaiveer Singh
Summary: This study reviews the microstructure and texture evolution of near beta, meta-stable beta, and stable beta-Ti alloys during plastic deformation and annealing treatment. Factors such as shear bands, martensite, dislocations, and precipitation significantly affect mechanical properties, while the deformation process influences microstructure and texture evolution. The activation of deformation mechanisms and presence of certain phases impact the ductility and strength of beta-Ti alloys, demonstrating the complexity of their mechanical behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
A. V. Dobromyslov, N. I. Taluts
Summary: A systematic study using transmission electron microscopy was conducted to investigate the formation and evolution of microbands in polycrystalline and single crystal copper samples subjected to spherically converging shock waves with different initial amplitudes. The study reveals that the presence of dislocation cells is not necessary for the nucleation of microbands, and the observed changes in the microband boundaries are associated with a shift in the deformation mechanism due to significant increase in active strains.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Multidisciplinary
Fei Yin, Xia Ye, Hongbing Yao, Pengyu Wei, Xumei Wang, Jiawei Cong, Yanqun Tong
Summary: By conducting laser shock experiments on titanium alloy using Neodymium-Yttrium-Aluminum Garnet laser, the study investigated the surface morphology changes and forming factors under different parameter settings, resulting in the formation criteria of titanium alloy. The experiments showed that factors like laser energy and impact times influenced the target shape variations.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Afrouz Hassanpour, Mayur Vaidya, Sergiy Divinski, Gerhard Wilde
Summary: The impact of different thermo-mechanical treatments on shear band diffusion in a model bulk metallic glass was investigated. It was found that HPT processing and cold rolling can enhance diffusion rates, while cryogenic thermo-cycling further increases shear band diffusion speed.
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: Fracture behavior of bulk metallic glass matrix composites with both transforming and non-transforming fi-Ti dendrites under shear and opening modes was examined, showing lower fracture toughness in mode II due to shear dominant stress state and considerable crack growth in this mode. Despite the ability of transforming dendrites to strain harden and enhance ductility, BMGCs reinforced with non-transforming dendrites exhibit higher toughness in both modes. Shear band patterns suggest identical fracture mechanism in BMGCs and BMGs, with differences rationalized by the effect of relaxation enthalpy and dendrites length scale.
Article
Chemistry, Physical
Fang Hao, Yuxuan Du, Peixuan Li, Youchuan Mao, Deye Lin, Jun Wang, Xingyu Gao, Kaixuan Wang, Xianghong Liu, Haifeng Song, Yong Feng, Jinshan Li, William Yi Wang
Summary: The localized features of adiabatic shear bands in the damage tolerance alpha+beta dual-phase Ti alloy were investigated in this study. The study identified factors contributing to plastic deformation and softening behaviors, suggesting promising approaches for fabricating advanced damage tolerance dual-phase Ti alloys.
Article
Materials Science, Multidisciplinary
Youlin Zhu, Jianian Hu, Qinqin Wei, Jian Zhang, Yi Sun, Guoqiang Luo, Qiang Shen
Summary: This study investigates the shock deformation and spalling behavior of single-crystal aluminum under different pulse shapes using Molecular Dynamics simulation. It is found that the pulse shape has an influence on the spall strength by affecting the compression temperature rise, and it also regulates the evolution of damage through wave propagation and void coalescence. The ramp wave loading pattern achieves higher spall strength and milder injuries, while the pulse shape affects the coalescence of voids.
MECHANICS OF MATERIALS
(2023)
Article
Chemistry, Physical
Y. S. Luo, J. J. Li, Z. Wang, M. Zhang, J. W. Qiao
Summary: Based on a simple mean-field model, two distinct types of slip avalanches in serrated plastic flows of bulk metallic glasses were identified to differentiate the slipping modes of shear bands under various strain rates. Small avalanches propagate progressively, while large avalanches follow a simultaneous propagation. By defining a weakening parameter and critical size, researchers were able to characterize the completely disparate shearing modes, with larger weakening and lower critical sizes indicating more activated shear transformation zones, offering a new method to explore plasticity in bulk metallic glasses.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Manufacturing
Karthik Palaniappan, M. Sundararaman, H. Murthy, R. Jeyaraam, Balkrishna C. Rao
Summary: This work investigates the influence of texture on chip formation during machining of Ti-6Al-4V alloy. Different textures were produced using cold-rolling, and the morphology of chips varied between cold-worked and annealed samples due to the developed texture. The developed texture affects the strain necessary for fracture initiation in the primary shear zone, thus affecting the spatial frequency of segmentation.
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2022)
Article
Engineering, Manufacturing
Reza Alaghmandfard, Dharmendra Chalasani, Amir Hadadzadeh, Babak Shalchi Amirkhiz, Akindele Odeshi, Mohsen Mohammadi
ADDITIVE MANUFACTURING
(2020)
Review
Materials Science, Multidisciplinary
Felipe M. F. Serafim, Wahab O. Alabi, Ikechukwuka N. A. Oguocha, Akindele G. Odeshi, Richard Evitts, Regan J. Gerspacher, Enyinnaya G. Ohaeri
Summary: The study found that UNS S31603 steel showed significant susceptibility to SCC in KCl solution, while the duplex steels exhibited considerable resistance. Examination of surfaces of failed specimens suggested a mixture of ductile and brittle fractures.
Article
Engineering, Chemical
Kasia McChesney, Michael Trask, Dakota Penner, Richard Evitts, Glyn Kennell, Ikechukwuka Oguocha, Akindele Odeshi
Summary: The study found that mid-range slurry concentrations require the highest protection current density in pipelines carrying potash slurry. Higher flow velocities demand higher protection current density, and lead to reaching maximum protection current density at lower slurry concentrations.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Reza Alaghmandfard, Dharmendra Chalasani, Akindele Odeshi, Mohsen Mohammadi
Summary: This study investigates the dynamic mechanical properties and deformation mechanisms of electron beam melted Ti-6Al-4V cylindrical rod at elevated and high strain rates. The results show that samples deformed at higher strain rates exhibit higher compressive strength and total strain. With the increase in strain rate, the microstructure becomes finer and there is an increase in the fragmentation of alpha-lamella.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
F. M. F. Serafim, I. N. A. Oguocha, A. G. Odeshi, R. Evitts, R. J. Gerspacher, E. G. Ohaeri, A. A. Tiamiyu, W. O. Alabi
Summary: The deformation behavior of selected stainless steels was evaluated at different strain rates, showing relatively constant total strain at fracture within a certain range of strain rates. However, a decrease in strain rate above a certain threshold resulted in lower strain. Each steel exhibited varying levels of strain rate sensitivity, with strain hardening rate and exponent increasing as strain rate decreased. Post-deformation microstructure evaluations showed different behaviors for different steels, with dimple diameter increasing and dimple density decreasing with higher strain rates.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Nanoscience & Nanotechnology
S. Dehgahi, R. Alaghmandfard, J. Tallon, A. Odeshi, M. Mohammadi
Summary: Maraging steel samples were additively manufactured and tested under dynamic impacts to study their behavior. The results showed that the fracture behavior of the samples varied at different strain rates, with adiabatic shear bands forming at high strain rates. Additionally, a constitutive model was developed to better understand the high strain rate behavior of the samples, showing good agreement with experimental results.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Composites
I. A. Abdulganiyu, I. N. A. Oguocha, A. G. Odeshi
Summary: The study found that carbon fiber reinforcement in phenolic resins significantly increased the flexural strength, but the flexural modulus decreased with the addition of SiC microfillers. The tendency for failure worsened at microfiller addition of >= 1.5 wt.%.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
S. Dehgahi, H. Pirgazi, M. Sanjari, R. Alaghmandfard, J. Tallon, A. Odeshi, L. Kestens, M. Mohammadi
Summary: The study investigated the dynamic mechanical behavior and texture evolution in maraging steels manufactured using LPBF at different strain rates. Results showed a strong strain rate dependence on the crystallographic texture in as-built samples, while strain rate had no significant effect on texture evolution in heat-treated samples.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
S. Dehgahi, H. Pirgazi, M. Sanjari, P. Seraj, A. Odeshi, L. A. Kestens, M. Mohammadi
Summary: Rod-shaped samples of maraging steel were fabricated using laser powder bed fusion technique in vertical and horizontal directions. The samples exhibited different mechanical properties under high strain rate conditions. Vertically built samples showed higher elongation, while horizontally built samples showed higher dynamic strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
S. Dehgahi, H. Pirgazi, M. Sanjari, P. Seraj, A. Odeshi, L. Kestens, M. Mohammadi
Summary: The deformation performance of laser powder bed fusion fabricated maraging steel samples was evaluated using the split Hopkinson torsion bar test. Results showed that the samples fractured under high strain rates and when deformed using a 12-degree twist angle. Texture weakening and grain fragmentation were observed with increasing strain rate. Simulation results based on empirically and semi-empirically models agreed well with experimental data.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Reza Alaghmandfard, Mostafa Mahdavi, Payam Seraj, Hadi Pirgazi, Dharmendra Chalasani, Babak Shalchi Amirkhiz, Leo Kestens, Akindele Odeshi, Steven Liang, Hamid Garmestani, Mohsen Mohammadi
Summary: Ti-6Al-4V cylindrical rods fabricated through the electron beam melting technique were subjected to compression loadings at different strain rates. The results showed that vertically built samples had superior strength and finer microstructure, which were confirmed by hardness measurements and texture analysis.
Article
Materials Science, Multidisciplinary
R. Alaghmandfard, P. Seraj, M. Sanjari, H. Pirgazi, C. Dharmendra, A. G. Odeshi, B. Shalchi Amirkhiz, M. Mohammadi
Summary: This study investigates the influence of strain rate on the microstructural and texture evolution, adiabatic shear band characterization, and deformation mechanism of electron beam melted Ti-6Al-4V cylindrical rods. The results show that increasing the strain rate leads to higher maximum stress and total strain in the alloy, as well as more severe deformation with higher dislocation density and intense shear strain localization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
T. D. Truong, G. Asala, O. T. Ola, O. A. Ojo, A. G. Odeshi
Summary: The microstructural and damage evolution of laser-based directed energy deposition (DED) fabricated 18%Ni M350 maraging steel under dynamic impact loading are investigated. The influence of additive manufacturing (AM) processing parameters, including laser power, powder feed rate, and energy area density (EAD) are discussed. The test results reveal that materials processed with the lowest EAD parameters exhibit the greatest impact strength under dynamic impact loading for all directions. However, these materials are the most susceptible to the development of adiabatic shear bands leading to cracking and fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Polymer Science
Ibraheem A. Abdulganiyu, Oluwasegun. E. Adesola, Ikechukwuka N. A. Oguocha, Akindele G. Odeshi
Summary: The dynamic impact properties of carbon-fiber-reinforced phenolic composites (CFRPCs) modified with microfillers were studied. It was found that the impact properties of HRJ-15881-based CFRPCs increased with SiC addition up to 1.5 wt.%, while those of SP-6877-based composites increased only up to 0.5 wt.%. At an impact momentum of 28 kg m/s, the impact properties of both types of composites increased up to 0.5 wt.% SiC addition. However, the addition of colloidal silica did not improve the dynamic impact properties of composites based on both phenolic resins at both impact momentums.
Article
Materials Science, Composites
Edison E. Haro, Akindele G. Odeshi, Santiago Castellanos, Xavier Sanchez, Lenin Abatta, Linker Criollo, Alejandra Alban, Jerzy A. Szpunar
Summary: Hybrid composites armors made of closed-cell aluminum foam were developed for ballistic protective plates. The addition of various micro and nano-fillers to the aluminum foam plates enhanced the ballistic response of the armors. The highest impact energy absorption capacity was achieved with the deposition of Kevlar micro-fibers, but resulted in plates with higher weight and thickness. Silica carbide powder, gamma alumina, and colloidal silica powder improved impact energy absorption capability with lower weight and thickness. Introduction of micro and nano-fillers coating on closed-cell aluminum foam improved the interfacial bonding between layers of the composites.
COMPOSITES PART C: OPEN ACCESS
(2023)