Article
Materials Science, Multidisciplinary
Diaoyu Zhou, Taotao Li, Jing Fan
Summary: The effects of plastic deformation on the corrosion behaviors of AA6061 aluminum alloy were investigated in this study. The results showed that plastic deformation induced changes in the corrosion behavior of AA6061 due to the increase in the number and decrease in the size of second-phase particles, leading to a special corrosion mechanism. The influence of crystallographic texture on corrosion property was also analyzed and a simple relation between corrosion coefficients and texture coefficients was established and supported by experiments to elucidate the effects of plastic deformation on corrosion.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
K. Bobzin, C. Kalscheuer, M. Tayyab
Summary: This study aims to investigate the combined effect of coating thickness, morphology, elastic-plastic deformation, and residual stress state on the impact fatigue behavior of coated tool steel substrates. The investigation found that thick coatings showed reduced resistance against the initiation of fatigue cracks and the cumulative effect of chemical composition, morphology, residual stress state, and elastic-plastic deformation behavior significantly influenced the impact fatigue. This study contributes to adjusting the physical vapor deposition coating thickness and resulting coating properties for a longer tool service life in cyclic impact loading applications.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
H. D. Yang, L. B. Zhang, J. S. Zhang, H. H. Tang, S. H. Chen
Summary: Understanding the effects of cooling rate and sample size on the plastic deformation behavior of metallic glasses is crucial. This study found that increasing the cooling rate significantly enhances the plasticity of metallic glasses, while decreasing the sample size only moderately improves the plasticity. The cooling rate has a greater influence on the plastic deformation behavior than the size effect, and the size effect is also dependent on the cooling rate.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Physics, Applied
R. Shi, H. Y. Song, L. Han
Summary: The effects of size and spacing of amorphous nanopillars on mechanical properties and BP interface migration behavior of bicrystalline Mg alloys were investigated. The results showed that the introduction of amorphous nanopillars reduced the yield stress of the alloys and hindered the migration of the BP interface.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
V. K. Euser, D. R. Jones, D. T. Martinez, J. A. Valdez, C. P. Trujillo, C. M. Cady, S. J. Fensin
Summary: The effect of microstructure on the shock response of 1045 steel was investigated through plate impact experiments and postmortem characterization. Three unique microstructures were explored: ferrite-pearlite, martensite, and ferrite with spheroidal cementite. The results showed that the spheroidized microstructure exhibited discontinuous yielding due to low initial dislocation density and dislocation nucleation rate, while the ferrite-pearlite and martensite microstructures exhibited continuous yielding. The spall strength varied among the different microstructures, with martensite showing the highest spall strength due to a high density of low energy boundaries.
Article
Nanoscience & Nanotechnology
Jinhua Peng, Zhen Zhang, Huanhuan Cheng, Liangyu Chen, Qianhao Zang, Sheng Lu, Tingting Guo, Wei Zhou, Yucheng Wu
Summary: The effect of working hardening on deformation mechanisms and strain hardening behavior was revealed by imposing varying degrees of strain on AZ31 hot-extrusion bars through ambient extrusion. It was found that as the extrusion strain increased, the yield strength increased gradually while the ductility sacrificed. The working hardening had varying effects on different loading directions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Yinchao Wu, Zhongwei Wang, Jiaolong Chen, Yanlong Ma, Yu Yan, Lijie Qiao
Summary: This study investigated the effect of frictional frequency on the subsurface evolution of 316L stainless steel in tribocorrosion and its influence on the synergistic effect between corrosion and wear. The results indicated that the frictional frequency showed a non-monotonic influence on the tribocorrosion behavior of the stainless steel.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Lin Pi, Junjie He, Xinpei Zhang, Yang Chen, Ming Liang, Guangjie Xue, Xiaoyu Yang, Meng Xing, Kai Xiong, Shunmeng Zhang, Yong Mao
Summary: The effect of Li element on the microstructure and texture evolutions of Mg-2Zn alloy sheet during room temperature bending was investigated. The addition of 3 wt.% Li modified the texture of the extruded Mg-2Zn sheet, resulting in improved bendability. The TD-elongated texture distribution provided more efficient deformation modes during bending, releasing the thickness strain more effectively compared to the extruded Mg-2Zn sheet.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Libin Zang, Yong Chen, Weijie Hou, Tao Sun, Yimin Wu, Baoshan Zhao
Summary: In this paper, the contact stress of the tooth surface under different coefficients of friction is calculated using the finite element method. The contact fatigue test and transmission performance of carburized 20MnCrS5 helical gears with different thicknesses of manganese phosphate conversion coating were conducted, and the influence of solid lubricating coating on the gear's contact fatigue performance was discussed. The results showed that the contact fatigue life of the gear treated with manganese phosphate conversion coating improved by over 100%, with the 12 μm thickness coating exhibiting the highest fatigue life.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
P. C. Han, N. R. Tao
Summary: Deformation and annealing were combined to optimize the mechanical properties of metallic materials. The study found that there were differences in the strength-ductility trade-off between the dynamic plastic deformation-induced structures and annealed structures in Cu and Cu-4.5Al alloy. It was suggested that high performance metallic materials can be obtained by just one-step plastic deformation without subsequent annealing treatment.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Ceramics
Yu Ogura, Atsutomo Nakamura, Tatsuya Kameyama, Yasuyoshi Kurokawa, Eita Tochigi, Naoya Shibata, Tsukasa Torimoto, Sena Hoshino, Tatsuya Yokoi, Katsuyuki Matsunaga
Summary: Recent research discovered that inorganic semiconductor zinc sulfide (ZnS) can exhibit high plasticity even at room temperature when deformed in darkness. The plastic deformation at room temperature can generate high density of glide dislocations in the crystal without changing the point defect structure significantly, and these dislocations themselves can exhibit unique luminescence properties.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Physics, Multidisciplinary
Li Yu, Zheng Qiu-Yang, Zhou Zhen-Yu, Ding Cong, Ye Sen-Bin, Piao Zhong-Yu
Summary: This study simulated the scratching process of copper material during electrically-assisted machining using the MD method, and analyzed the effects on surface morphology, potential energy change, stress distribution, and crystal defect structure evolution. The results showed that electric current effectively expands the plastic deformation zone and enhances the plastic deformation ability of single-crystal copper. Electric current also improves the interaction between dislocations and grain boundaries, promoting the crossing of dislocations. This research provides guidance for optimizing surface strengthening techniques to achieve better surface properties of metals.
Article
Materials Science, Multidisciplinary
Chunxiang Zhang, Hao Xue, Shiping Xing, Junting Luo
Summary: The electric field-assisted (EFA) heat treatment is proposed to solve excessive grain growth problem of beta phase during the heat treatment of ZrTiAlV alloy. The effect of EFA heat treatment on phase transformation and microstructure of as-forged and severe plastic deformation (SPD) alloys were investigated. Pure beta phase can be obtained for the as-forged 47Zr alloy by holding at 700 degrees C for 5 min. However, after SPD, an extension of the holding time to 15 min was required due to the increased defect concentration in the alloy, which reduced the effectiveness of the EFA heat treatment. Furthermore, a new mechanism for the transition of needle-like alpha phase to beta phase was proposed, where dislocations in the beta-phase matrix shear the needle-like alpha phase, resulting in the formation of a large number of stacking faults inside it, which are then transformed into the beta phase through atomic plane slippage.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Junyun Chen, Wanxue Zhang, Ke Tong
Summary: In this study, the response of nanotwinned diamonds under scratching was investigated using molecular dynamics simulation. The researchers systematically studied the morphology of chips and subsurface damage, the distribution of temperature and stress, the formation process of subsurface damage, and the plastic deformation mechanism. Compared to single-crystal diamonds, nanotwinned diamonds exhibited more obvious plastic deformation, with partial dislocations slipping on {111} planes parallel to the twin boundaries. Detwinning was also observed during subsurface damage formation. These findings provide theoretical guidance for the application of nanotwinned diamonds.
APPLIED SURFACE SCIENCE
(2023)
Article
Pharmacology & Pharmacy
Kostas Giannis, Arno Kwade, Jan Henrik Finke, Carsten Schilde
Summary: The aim of this study was to investigate the deformation behavior of non-spherical particles during high-load compaction using the multi-contact discrete element method (MC-DEM). The bonded multi-sphere method (BMS), which incorporates intragranular bonds between particles, and the conventional multi-sphere (CMS), where overlaps between particles are allowed to form a rigid body, were used. The results showed that the BMS method was able to handle large elastic deformations and achieved good agreement with experimental data, while the CMS approach had limitations in capturing the compression behavior of a single rubber sphere.
Article
Nanoscience & Nanotechnology
Ankit K. Singh, Katarina Adstedt, Billyde Brown, Preet M. Singh, Samuel Graham
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Nuclear Science & Technology
Preet M. Singh, Kevin J. Chan, Chaitanya S. Deo, Vinay Deodeshmukh, James R. Keiser, Weiju Ren, T. L. Sham, Dane F. Wilson, Graydon Yoder, Jinsuo Zhang
ANNALS OF NUCLEAR ENERGY
(2019)
Article
Materials Science, Multidisciplinary
Z. Zhang, Z. F. Hu, P. M. Singh, X. Li, S. Xiong, X. X. Fang
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2019)
Article
Materials Science, Multidisciplinary
Liang He, Lovelyn Wirian, Preet M. Singh
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2019)
Article
Construction & Building Technology
Robert D. Moser, Preet M. Singh, Lawrence F. Kahn, Kimberly E. Kurtis, David Gonzalez Nino, Zackery B. McClelland
CONSTRUCTION AND BUILDING MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
Kevin J. Chan, Preet M. Singh
JOURNAL OF NUCLEAR MATERIALS
(2020)
Article
Nuclear Science & Technology
Kevin J. Chan, Preet M. Singh
NUCLEAR TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
James R. Keiser, Preet M. Singh, Michael J. Lance, Harry M. Meyer, Kristian G. Myhre, Tracie M. Lowe, Dino Sulejmanovic, Ercan Cakmak, Victoria A. Cox, C. Shane Hawkins, Adam W. Willoughby
Summary: The increased demand for renewable energy resources has sparked a renewed interest in nuclear reactors, including a new generation of molten salt reactors. The handling of molten chloride or fluoride salts poses a challenge due to the inability of metals to form and retain a protective oxide surface layer. A specific alloy, Hastelloy N, was developed to address this issue, but it had some deficiencies. For the next generation of molten salt reactors, an alloy with higher temperature capability and pressure vessel code approval is required, leading some reactor designers to opt for 316H stainless steel. To minimize corrosion of the stainless steel by the molten fluoride salt, beryllium metal can be added to react with impurities and lower the oxidation potential. However, there are concerns about the potential reaction between beryllium and the stainless steel components.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Clinical Neurology
James M. Mok, Kornelis Poelstra, Kevin Ammar, Matthew McGirt, Jason Cormier, Robert Hart, Jordan Bauman, Pam Cowart, Ishan Sheth, Preet Singh, Jay Yadav
Summary: The metal ion release profile of MoRe alloy was evaluated in vitro in both a physiologic and inflammatory environment. The results showed that the MoRe alloy had very low molybdenum and rhenium ion release rates, which were well below the established FDA-permitted daily exposure. In contrast, titanium and cobalt chromium alloys had higher levels of ion release in an inflammatory environment that exceeded the FDA-permitted daily exposure.
Article
Materials Science, Multidisciplinary
Krishna Moorthi Sankar, Preet M. Singh
Summary: Molten fluoride salts are widely used in many applications, but the corrosion of structural materials in contact with them is a major concern in the design process. The study found that impressed current cathodic protection is an effective method to prevent corrosion of stainless steel in molten fluoride salts, but the applied current needs to be optimized to avoid undesirable side effects.
Article
Nuclear Science & Technology
Krishna Moorthi Sankar, James R. Keiser, Dino Sulejmanovic, Tracie M. Lowe, Preet M. Singh
Summary: Reliable performance of structural alloys is crucial for the success of Generation-IV fluoride salt-cooled high-temperature reactors (FHRs). The corrosion mechanism of alloys exposed to molten fluoride salts is selective dealloying of active elements. Alloy composition affects both mechanical properties and corrosion behavior. Twelve Ni-based or Fe-based alloys were tested for their corrosion behavior in FLiBe, and the results showed a correlation between alloy degradation and overall composition, as well as the ratio of major active elements to more noble alloying elements.
NUCLEAR TECHNOLOGY
(2023)
Article
Electrochemistry
Liang He, Yushu Wang, Preet M. Singh
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2020)
Proceedings Paper
Materials Science, Characterization & Testing
Liang He, Gaoxiang Wu, Preet M. Singh
ADVANCES IN ELECTROCHEMICAL TECHNIQUES FOR CORROSION MONITORING AND LABORATORY CORROSION MEASUREMENTS
(2019)
Article
Materials Science, Multidisciplinary
B. Aydin Baykal, Preet M. Singh
MATERIALS PERFORMANCE AND CHARACTERIZATION
(2019)
