Article
Nanoscience & Nanotechnology
Bangqi Yin, Xiangyi Xue, Bin Tang, William Yi Wang, Hongchao Kou, Jinshan Li
Summary: Nanoindentation experiments and crystal plasticity simulations were combined to investigate the deformation behavior and hardness characteristics of the alpha 2 phase in Ti-43.5Al-4Nb-1Mo-0.1B alloy. The results showed a correlation between crystal orientation and hardness, with slip behavior being influenced by Schmid factors.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Chaitanya Paramatmuni, Anil Bandi, Anand K. Kanjarla
Summary: The ductility of Magnesium alloys is often limited by the strong basal texture. Previous attempts to reduce the intensity of basal textures involved adding rare earth (RE) elements. However, due to cost and scarcity, alloys with calcium and tin have recently been introduced. Among them, Mg-2Sn-2Ca alloys have shown high strength in extruded condition. This study reports the mechanical properties of the alloy in sheet form for the first time, examining in-plane mechanical anisotropy, texture, microstructure, and deformation twins.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Suman Paik, N. Naveen Kumar, B. K. Dutta, R. Tewari, P. Durgaprasad
Summary: This article investigates the deformation behavior and fracture characteristics of copper single crystals through experimental and simulation analysis. The experiments involve uniaxial tensile tests on single crystals with different orientations, resulting in different ductile failure modes. The orientation of slip traces in deformed crystals are determined through scanning electron microscopy and theoretical analysis. Crystal plasticity finite element simulations are then used to rationalize the experimental results and evaluate the agreement between different data.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Maral Sarebanzadeh, Alberto Orozco-Caballero, Javier LLorca
Summary: The transfer of basal-to-basal slip across grain boundaries was studied in weakly-textured pure Mg specimens deformed in tension using slip trace analysis and electron back-scatterer diffraction. Basal slip was the dominant deformation mechanism in most grains, and the transfer/blocking of slip at grain boundaries was examined. The active slip system(s) in the grains were determined by analyzing the rotation of grains caused by plastic slip along the basal slip systems. Additionally, the orientation of grain boundaries was measured to determine the twist angle theta.
Article
Engineering, Mechanical
Jingjing Wang, Arun Prasanth Naglingam, Abhishek Saini, Zeqing Sun, Bing Wang, Guijun Bi
Summary: The micro-mechanical behavior of lamellar structured Ti6Al4V alloy under a small compressional strain has been studied, and the strain and stress were found to mainly localize along grain boundaries, triple points, and grain interiors. The distribution of strain and stress is affected by crystallographic orientation, size, shape, and grain-grain interactions. Local dislocation behavior and its relation to strain incompatibility were investigated, and the presence of meso-bands and mini-bands were observed through EBSD and crystal plasticity simulation. The dominant slip mechanism was found to be prismatic slip, with dislocations originating from high angle grain boundaries extending into grain interiors.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Yingjun Sun, Kecheng Zhou, Hua Qiao, Renlong Xin, Huamiao Wang, Peidong Wu
Summary: For polycrystalline materials with the deformation mechanism of twinning, the interaction between the twins and grain boundaries play a significant role in their deformation behavior. In this study, the twin transmission across grain boundaries in a magnesium bicrystal was investigated using a crystal plasticity finite element model, with factors like crystallographic orientation, GB misorientation, CRSS, dislocation slip, and twin-induced stress relaxation considered. The CSF was found to interpret twin transmission better and accurately capture the fraction of twin-transmitted grain boundaries.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Yahui Liu, Qianqian Zhu, Kexing Song, Yanjun Zhou, He Liu, Xiaokang Yang, Shifeng Liu, Lingfei Cao
Summary: This study investigates the deformation mechanism of tantalum sputtering target using the electron backscatter diffraction method. The results show that the orientation density increases after deformation, lattice rotation causes misorientation between grains, and the activation of slip systems is related to strain concentration.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
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
Ushasi Roy, David L. McDowell, Min Zhou
Summary: A multiscale cohesive finite element computational framework was developed to predict the fracture properties of polycrystalline metals, focusing on the effects of crystallographic texture on fracture toughness. By analyzing the competing effects between different fracture mechanisms, the framework allows exploration of the influence of microstructure on macroscopic fracture measures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Xun Zeng, Chuanlai Liu, Chaoyu Zhao, Jie Dong, Franz Roters, Dikai Guan
Summary: Tensile twinning is an important deformation mode in hexagonal close packed structure metals. A study using large area 3D electron backscatter diffraction (EBSD) measurement and crystal plasticity modeling in a magnesium alloy revealed that conventional 2D EBSD scans underestimated the twinning activity. The study also investigated the effects of Schmid factor (SF) on twinning and found surprising high twin frequencies in middle SF grains. Shear stress was found to play a crucial role in facilitating twin nucleation and growth in high SF grains.
Article
Mechanics
Suman Paik, B. K. Dutta, N. Naveen Kumar, R. Tewari
Summary: The present study investigates the fracture properties of a cracked Ni3Al-based intermetallic single crystal turbine blade under tensile load, considering microstructure, strain hardening, and damage development. The analysis uses a continuum damage criterion and a crystal plasticity model with non-Schmid effects to evaluate material damage due to localized deformation. The coupled model successfully replicates the stress-strain behavior of Ni3Al single crystals until material softening after necking. The study assesses the damage evolution near the crack tip for different crystallographic orientations, helping to calculate the fracture initiation toughness (Ji) and characterizing it using the triaxiality quotient (q).
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Chemistry, Physical
Bangqi Yin, Xiangyi Xue, Mengqi Zhang, Taiqing Deng, Jinshan Li, Bin Tang
Summary: Load-displacement curves of gamma and B2 phases in TNM alloy were obtained from nanoindentation experiments and CPFE simulations, showing good consistency and small hardness error. The pileup morphology around indents was discussed based on nanoindentation tests and CPFE simulation, and its relationship with slip behavior and dislocation movement was analyzed. The results indicate that Schmid factors and dislocation movement significantly influence the pileup profile, affecting the flow ability of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Nanoscience & Nanotechnology
Zhaowen Huang, Donghui Wen, Xionghua Jiang, Anding Wang, Yusheng Li, Yang Cao, Xiaodong Hou, Biao Wang, Yuntian Zhu
Summary: The slip system variations induced by excess yield stress in Ti at the early stage of plastic deformation were studied in-depth. It was found that normal grain refinement and suppressed dislocation source activation in refined-grain can significantly increase the yield stress. Combined calculations of Schmid factor and critical resolved shear stress showed that small-grain samples with higher yield stress can activate both < a >-prismatic slip and < c+a >-pyramidal slip, while large-grain samples can only activate < a >-prismatic slip. This slip system transition can explain the abnormal fine-grain strengthening effect and stress drop after yielding in Ti.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Jiangkun Fan, Wenyuan Zhang, Bobo Li, Kaidi Li, Yang Wang, Peng Jiang, Chuanyun Wang, Xiangyi Xue, Hongchao Kou, Jinshan Li
Summary: This study systematically characterized the activation of deformation systems in Ti-6Al-3Nb-2Zr-1Mo (Ti6321) alloy under in situ tensile and quasi-in situ dwell fatigue tests. The critical resolved shear stresses of basal and prismatic slip systems in the alloy were calculated using slip trace analysis. The study revealed that basal and prismatic slips were the major microscopic deformation modes during dwell fatigue, with basal slip being predominant. The results indicated that the elastic anisotropy of the hexagonal-closed-packed (HCP) structure could induce heterogeneous microscopic stress and activate basal slip activities, which played a role in crack initiation through basal plane and (0001) twist boundary cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Felix Hofmann, Nicholas W. Phillips, Suchandrima Das, Phani Karamched, Gareth M. Hughes, James O. Douglas, Wonsuk Cha, Wenjun Liu
PHYSICAL REVIEW MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Zhao Shen, David Tweddle, Hongbing Yu, Guanze He, Aakash Varambhia, Phani Karamched, Felix Hofmann, Angus J. Wilkinson, Michael P. Moody, Lefu Zhang, Sergio Lozano-Perez
Article
Materials Science, Multidisciplinary
Yi Xiong, Phani Karamched, Chi-Toan Nguyen, David M. Collins, Christopher M. Magazzeni, Edmund Tarleton, Angus J. Wilkinson
Article
Chemistry, Physical
Benjamin M. Jenkins, James O. Douglas, Hazel M. Gardner, David Tweddle, Anna Kareer, Phani S. Karamched, Nick Riddle, Jonathan M. Hyde, Paul A. J. Bagot, G. Robert Odette, Michael P. Moody
APPLIED SURFACE SCIENCE
(2020)
Article
Microscopy
Naganand Saravanan, Phani S. Karamched, Junliang Liu, Claire Rainasse, Fabio Scenini, Sergio Lozano-Perez
Article
Materials Science, Multidisciplinary
Yuanbo T. Tang, Neil D'Souza, Bryan Roebuck, Phani Karamched, Chinnapat Panwisawas, David M. Collins
Summary: The study revealed the influence of subtle composition differences on work hardening rates in a single crystal nickel-base superalloy, and highlighted the butterfly morphology and deformation patterning of the gamma' precipitates as well as the critical role of local plasticity and residual stresses in the formation of recrystallization defects.
Article
Nanoscience & Nanotechnology
Hongbing Yu, Suchandrima Das, Haiyang Yu, Phani Karamched, Edmund Tarleton, Felix Hofmann
SCRIPTA MATERIALIA
(2020)
Article
Multidisciplinary Sciences
Yilun Xu, Sudha Joseph, Phani Karamched, Kate Fox, David Rugg, Fionn P. E. Dunne, David Dye
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Hongbing Yu, Phani Karamched, Suchandrima Das, Junliang Liu, Kenichiro Mizohata, Felix Hofmann
Summary: Understanding defect production and evolution under irradiation is a complex multi-scale problem. By utilizing advanced techniques in the scanning electron microscope, such as ECCI and HR-EBSD, researchers were able to image nano-scale defects and probe lattice strain fields associated with irradiation damage, revealing a transition from disordered to long-range ordered structures driven by elastic interactions between pre-existing defects and new cascade damage at different doses.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Kay Song, Hongbing Yu, Phani Karamched, Kenichiro Mizohata, David E. J. Armstrong, Felix Hofmann
Summary: Understanding the mechanisms of plasticity in structural steels is crucial for the operation of next-generation fusion reactors. This study focuses on the deformation behavior of FeCr and aims to differentiate the nucleation process of dislocations for initiating plasticity from their propagation through the material. The results show that the nucleation of dislocations is mainly derived from pre-existing sources and is not significantly affected by the presence of irradiation defects or Cr content.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Abdalrhaman Koko, Elsiddig Elmukashfi, Thorsten H. Becker, Phani S. Karamched, Angus J. Wilkinson, James Marrow
Summary: This study used high angular resolution electron backscatter diffraction to quantify the local elastic field in intragranular slip bands of age-hardened duplex stainless steel, revealing the changes in elastic fields around the tip of slip bands under different loading conditions.
Article
Materials Science, Multidisciplinary
Yi Xiong, Nicolo Grilli, Phani S. Karamched, Bo-Shiuan Li, Edmund Tarleton, Angus J. Wilkinson
Summary: Digital image correlation and dislocation-based crystal plasticity simulation were used to investigate the cold dwell behavior in a coarse grain Ti-6Al alloy at different temperatures. The study revealed the temperature-dependent critical resolved shear stresses of the main slip systems and observed load shedding mechanisms in certain grain pairs. The worst case scenario was found at 120 degrees C, which was attributed to the combined effects of strain rate sensitivity and geometrically necessary dislocations.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Letter
Materials Science, Multidisciplinary
Yi Xiong, Phani S. Karamched, Chi-Toan Nguyen, David M. Collins, Christopher M. Magazzeni, Edmund Tarleton, Angus J. Wilkinson
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Raghunandan Ummethala, Phani S. Karamched, Sokkalingam Rathinavelu, Neera Singh, Akash Aggarwal, Kang Sun, Eugene Ivanov, Lauri Kollo, Ilya Okulov, Juergen Eckert, K. G. Prashanth
Article
Green & Sustainable Science & Technology
Veerababu Gollapalli, Srinivasa Rao Tadivaka, Chenna Rao Borra, Suguna Soumya Varanasi, Phani S. Karamched, M. B. Venkata Rao
JOURNAL OF SUSTAINABLE METALLURGY
(2020)
