Article
Chemistry, Physical
Alessandro Schiavi, Claudio Origlia, Alessandro Germak, Andrea Prato, Gianfranco Genta
Summary: This study describes the experimental method and calculation model for determining the indentation moduli, work, and creep of metallic materials using macro-scale forces at room temperature. Various measurements and analysis methods were used to accurately determine these properties, with illustrative tests conducted on metal and alloy samples. Discussions were made regarding the suitability of the proposed methods and analysis.
Article
Engineering, Mechanical
Anthony Moulins, Francois Andrusyszyn, Roberto Dugnani, Ricardo J. Zednik
Summary: The temperature evolution of fracture toughness in single-crystal gallium arsenide (GaAs) on the (001) plane was investigated using Vickers indentation. The results showed a temperature-dependent decrease in hardness and increase in toughness, and revealed the composition and alignment of cleavage planes. The study also found a relationship between temperature and the types of cracks and slip produced.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Construction & Building Technology
Hongqiang Chu, Tao Wang, Lin Han, Li Cao, Ming-Zhi Guo, Yunchao Liang, Linhua Jiang
Summary: This study investigated the changes in local mechanical properties of cement paste under sulfate erosion by measuring micro-Vickers hardness. Factors such as water-to-cement ratio, sulfate concentration, chloride concentration, and current intensity were explored in relation to Vickers hardness. A prediction model was established to successfully predict Vickers hardness changes under varying conditions with high confidence.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Ceramics
Nicholas L. Clark, Shih-Yi Chuang, John C. Mauro
Summary: The study investigates the impact of microstructure on hardness in phase-separated calcium aluminosilicate glasses. Hardness changes are governed by microstructural deformations during indentation. Phase separation leads to decreased hardness due to incongruent yielding of droplet and matrix phases. Microstructures with dilute, spherical droplets have minimal impact on hardness, whereas microstructures with concentrated, acicular droplets deform through droplet coalescence, resulting in improved hardness.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Feng Wang, Guohe Li, Meng Liu, Dachun Wang, Dong Yan, Jianxu Fan
Summary: This study investigated the acquisition method of heterogeneous constitutive relationship of Ni60 laser cladding layer. Single and multi-channel lap Ni60 laser cladding layers were prepared and observed by electron microscopy, and the hardness was measured. The cladding layer was divided into different zones based on metallographic structure and Vickers hardness, and the elastic modulus of each zone was obtained using nano-indentation experiment. A finite element model was established to simulate the experimental process and the heterogeneous constitutive relationship of cladding layer was established based on the simulation and experimental results.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Jianwei Lu, Haifeng Wang, Yaogang Li, Yang Zhou, Weizhong Jiang
Summary: In this paper, the effects of the metastable MgAl2Si3O10 phase on the crystallization behavior and mechanical properties of a MgO-Al2O3-SiO2 (MAS) glass without nucleating agents were evaluated. The precipitation of metastable MgAl2Si3O10 crystallites promoted the transformation of crystallization mechanism and improved the mechanical properties. The glass-ceramics containing metastable MgAl2Si3O10 phase exhibited enhanced hardness and indentation size effect behavior. The load-independent hardness values for MAS glass and glass-ceramics were reliably evaluated by the modified proportional specimen resistance (MPSR) model.
CERAMICS INTERNATIONAL
(2023)
Article
Multidisciplinary Sciences
Ahmet Teymen
Summary: Hardness tests are practical and non-destructive methods to predict important engineering properties of rocks like UCS and E. Through statistical analyses using SR and MR techniques, strong correlations were found between UCS-E and hardness properties of rocks.
Article
Engineering, Mechanical
Xinbao Wang, Haiming Zhang, Xianghuai Dong
Summary: A novel ductile fracture model for AZ31B in electrically-assisted forming process is established based on experiments involving different stress states and electric pulse conditions. The proposed model considers stress triaxiality, Lode parameter and current parameters, and is verified to provide satisfactory prediction of ductile fracture behavior of AZ31B through specifically designed experiments.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Chemistry, Physical
Michael Kucher, Martin Dannemann, Niels Modler, Martina Romy Bernhard, Christian Hannig, Marie-Theres Weber
Summary: Standardized microindentation tests on human teeth showed strongly inhomogeneous material properties, depending on longitudinal and transversal positions, with comparable distributions in transversal cutting planes of different sections. Indentation modulus ranged from 12.2 GPa to 17.8 GPa, hardness from 0.4 GPa to 0.64 GPa, and creep from 8.6% to 10.7%.
Article
Materials Science, Multidisciplinary
Guelcan Toktas, Selman Korkmaz
Summary: This study investigates the fracture toughness of boride layers in ductile irons using the Vickers indentation method and demonstrates its reliability. Different boriding conditions were applied to alloyed and unalloyed ductile cast irons, and the morphology, hardness, and thickness of the boride layers were examined. The results showed that the fracture toughness of the boride layer varied with boriding time and temperature, with alloyed iron producing thicker boride layers.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Environmental
Sasan Ghorbani, Seyed Hadi Hoseinie, Ebrahim Ghasemi, Taghi Sherizadeh
Summary: This research aims to interpret the effect of textural characteristics on Vickers indentation hardness. Twelve fresh limestone samples from various quarries were tested and quantitative textural parameters were characterized using image processing techniques. The statistical analysis showed that Vickers indentation hardness was strongly influenced by textural properties, with grain size, aspect ratio, and texture coefficient having the greatest effect.
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2023)
Article
Engineering, Multidisciplinary
S. M. Dominguez-Nicolas, A. L. Herrera-May, L. Garcia-Gonzalez, L. Zamora-Peredo, J. Hernandez-Torres, J. Martinez-Castillo, E. A. Morales-Gonzalez, C. A. Ceron-Alvarez, A. Escobar-Perez
Summary: This paper presents a novel algorithm for automatic detection and measurement of Vickers indentation hardness using image processing. The algorithm uses image segmentation via binarization and standard histogram equalization to determine the optimal binarization threshold, and can be applied to indentation images with low contrast and irregular edges. The relative error of the algorithm results is less than 3% compared to those obtained through a conventional manual procedure.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
W. Porter Weeks, Katharine M. Flores
Summary: Vickers indentation methods are popular for determining hardness, fracture toughness, and crack initiation resistance in silicate glasses due to their simplicity and efficiency. However, obtaining consistent and repeatable results from these measurements is challenging. In this study, we investigated the effects of applied load, dwell time, and post-indentation observation time on the precision of hardness and fracture toughness values for soda-lime silicate glass measured via Vickers microindentation. The results show that low applied loads and short dwell times result in low precision, while longer dwell times lead to higher precision and load-independent fracture toughness. These findings suggest that Vickers microindentation could be a reliable technique for measuring mechanical properties of silicate glass.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Ceramics
Carsten Blaess, Ralf Mueller
Summary: Viscous healing of cracks induced by Vickers indentation was studied in different types of glasses. The master curves of crack length, width, and depth normalized to the initial crack length differed significantly among the glasses due to different crack healing phenomena. NAS showed the most rapid healing with least pronounced bulging and crack widening.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Geological
Davood Fereidooni, Fatemeh Ghasemi
Summary: The present research introduces a new method, mandrel indentation test (MIT), to evaluate surface hardness of rocks and building stones and compares its results with the Vickers hardness test. The study found a strong correlation and a direct linear relation between the values of the surface hardness resulted from the MIT and the Vickers test. The introduced approach is highly accurate and has high potential for evaluating surface hardness of building stones. Rating: 9 out of 10.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Chemistry, Physical
A. G. Abd-Elrahim, Doo-Man Chun
Summary: Ternary Co3O4-Ni(OH)(2)-graphene hybrid nanocomposites are synthesized using a facile kinetic spray process, resulting in enhanced oxygen evolution reaction performance. The optimized heterostructure exhibits nanosheet and nanoflake morphologies, with improvements in disorder-related modes and downshift of binding energies. The best synthesized material demonstrates excellent OER performance and long-term stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Green & Sustainable Science & Technology
Jinsik Kim, Doo-Man Chun, Hyung Wook Park, Jisoo Kim
Summary: Porosity is a common issue in powder bed fusion-based additive manufacturing, hindering the underwater application of printed products. This study presents the surface treatment of polyamide 12 (PA12) using large pulsed electron beam (LPEB) irradiations, which effectively reduces surface roughness and porosity. The treatment also enhances hydrophobicity and eliminates the capillary effect, making the PA12 suitable for underwater applications.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Sam Yaw Anaman, Jaekook Kim, Jong-Sook Lee, Jeong-Mook Choi, Hoon-Hwe Cho, Sung-Tae Hong
Summary: This study establishes a numerical model to study the galvanic corrosion behaviors of different materials in a friction stir welded joint. The effects of electrolyte depth and cathode-to-anode surface area ratios on the galvanic corrosion behaviors are investigated through experimental validation and electrochemical simulations.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Thanh Thuong Do, Siwhan Lee, Thi Tu Anh Bui, Thi Anh Nguyet Nguyen, Jong-Seok Lee, Heung Nam Han, Sung-Tae Hong
Summary: In this study, the simultaneous joining and forming of dissimilar steels were experimentally investigated using electrically assisted pressure joining (EAPJ) method. The results showed that sound solid-state joints were successfully fabricated and a target geometry was also successfully formed. The method can cause grain refinement and induce different microstructural changes in different zones, confirming the applicability of EAPJ in the simultaneous joining and forming of dissimilar steels.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Sam Yaw Anaman, Shengwei Zhang, Jong-Sook Lee, Hoon-Hwe Cho, Sung-Tae Hong
Summary: The influence of uniaxial tensile stress on the galvanic corrosion behavior of a dissimilar joint of stainless steel alloys in 0.5 M Na2SO4 electrolyte solution at room temperature is investigated. Experimental stress-corrosion test results show that the application of uniaxial tensile stress leads to a decrease in corrosion potential and an increase in corrosion rate compared to the nonstressed specimen. A numerical model is established and validated using the experimental stress-corrosion test results. Thus, a series of case studies are presented to examine the galvanic corrosion behavior of the joint under certain applied tensile strains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Green & Sustainable Science & Technology
Shengwei Zhang, Lihong Cai, Thi Anh Nguyet Nguyen, Meiling Geng, Kun Gao, Sung-Tae Hong, Moon-Jo Kim
Summary: Electrically assisted rapid heat treatment can balance the strength and formability of aluminum clad steel sheets by forming different intermetallic compounds that affect the interfacial bonding strength and mechanical properties. With the appropriate current density, improved elongation and interfacial bonding strength can be achieved.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Hwi Jun Son, Young Cheol Jeong, Bo Wook Seo, Sung-Tae Hong, Yu-Chan Kim, Young Tae Cho
Summary: Researchers conducted experiments on high-hardness armor steel plates using different welding methods to reduce the weight of combat vehicles and enhance bulletproof performance and durability. The results showed that the mechanical strength of the welded zone and the integrity of the welding process deteriorated as the CO2 content and heat input increased.
Article
Materials Science, Multidisciplinary
Kun Gao, Soumyabrata Basak, Shengwei Zhang, Sung-Tae Hong, Stephen Yeboah Boakye, Hoon-Hwe Cho
Summary: The microstructural characteristics and mechanical properties of friction stir lap welding (FSLW) of thin Al-clad Al and ultra-thin Al-clad mild steel sheets were investigated experimentally. The FSLW joints were successfully fabricated with no noticeable defects. The material flow was found to be asymmetrical between the advancing side (AS) and the retreating side (RS) of the stir zone (SZ). Fatigue tests showed different crack propagation modes due to the asymmetric geometry of the joint and different loading configurations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Industrial
Lihong Cai, Shengwei Zhang, Kun Gao, Van Loi Tran, Meiling Geng, Koo-Hyun Chung, Sung-Tae Hong
Summary: A combination of volatile medium (liquid CO2) and additive manufactured (AMed) die is suggested for achieving lubrication and quenching during hot stamping of aluminum alloys (AAs). The liquid CO2 serves as a lubricant and coolant, and is directly applied to the heated AA blank through the AMed die with confusor microholes. This approach reduces friction and induces solid solution treatment in the formed blank, facilitating subsequent artificial aging process.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2023)
Article
Chemistry, Physical
Van-Ta Do, Doo-Man Chun
Summary: Freshwater shortages pose a threat to ecosystems and human communities worldwide. Inspired by the water collection abilities of cacti and desert beetles, researchers have successfully developed a simple and low-cost method of fabricating a surface that efficiently harvests water. This was achieved by spraying a solution of isopropyl alcohol and a mixture of hydrophobic and hydrophilic silica nanoparticles onto a laminating film, followed by hot-press lamination with sandpaper. The resulting surface exhibited wettability contrast patterns and achieved a high water-harvesting efficiency.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Materials Science, Multidisciplinary
A. G. Abd-Elrahim, Doo-Man Chun
Summary: Two-dimensional nanomaterials, such as graphene nanosheets and molybdenum disulfide nanoflakes, were hybridized with spinel Mn3O4 through a simple kinetic spray approach. The resulting heterostructured Mn3O4-2D hybrid nanocomposites showed improved reaction kinetics for oxygen evolution. The hybrid nanocomposites exhibited decreased overpotential and improved charge transfer kinetics, leading to enhanced stability for prolonged galvanostatic polarization.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Physics, Multidisciplinary
Manar A. Ali, Doo-Man Chun, E. M. M. Ibrahim, A. G. Abd-Elrahim
Summary: CdS quantum dots were synthesized and characterized. The analysis showed the presence of bi-structural phases and small crystallite size, resulting in high DC conductivity and small activation energy. Furthermore, the AC conductivity and dielectric constant of CdS quantum dots exhibited temperature-dependent behavior.
Review
Engineering, Manufacturing
Sutanuka Mohanty, Soumyabrata Basak, Debasis Saran, Kajari Chatterjee, Turin Datta, Atul Kumar, Chandra Prakash, Doo-Man Chun, Sung-Tae Hong, Kisor Kumar Sahu
Summary: The selection and classification of materials for demanding applications in aviation/space, nuclear, oil & gas industries remain challenging due to the high requirements for microstructural, mechanical, and electrochemical properties. Surface engineering is crucial in controlling the properties of exposed surfaces, which play key roles in interactions with other materials and exposure to the environment, promoting desired chemical reactions, and preventing corrosion. This review focuses on the latest and most advanced surface engineering techniques such as laser, electron beam, friction stir processing, ion beam, and plasma immersion ion implantation, which significantly improve wear and corrosion resistance, reduce frictional losses, increase fatigue life, and enhance chemical stability at high temperatures for exotic applications.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
Review
Engineering, Manufacturing
Meiling Geng, Lihong Cai, Jin-Cheol Kim, Hyeon-Seok Choi, Sung-Tae Hong
Summary: Dry metal forming (DMF) is a sustainable metal forming process with economic and ecological benefits. Adopting appropriate strategies for dry forming tools and lubrication is crucial for successful DMF. This paper reviews the research on DMF development to promote its implementation as an alternative to conventional lubrication systems in metal forming processes.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Ji-Won Kang, Shengwei Zhang, Tu-Anh Bui Thi, Sung-Tae Hong, Siwhan Lee, Heung Nam Han
Summary: This study proposes a friction-assisted solid state lap joining process for dissimilar metal pipes, specifically joining copper (Cu) and aluminum (Al) pipes. The process consists of two stages, where in the first stage, the Cu pipe rotates with a mandrel against the inner surface of the Al pipe to break oxide layers and increase temperature at the interface. In the second stage, as the contact surface area between Cu and Al pipes increases due to linear motion of the mandrel, diffusion bonding occurs as the mandrel rotates alone against the stationary Cu pipe. Microstructural analysis and mechanical testing confirm the successful achievement of solid state lap joining between Cu and Al pipes for a lightweight heat exchanging component.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
