Article
Materials Science, Multidisciplinary
Pengjie Wang, Qiang Cao, Sheng Liu, Qing Peng
Summary: Femtosecond laser peening technique can increase surface hardness of stainless steel without decreasing surface roughness; Finite element analysis shows that this method does not lead to melting; Molecular dynamic simulations reveal the dislocation pinning mechanism during the peening process.
MATERIALS & DESIGN
(2021)
Article
Electrochemistry
T. Montoya, R. M. Katona, E. K. Karasz, J. M. Taylor, J. Snow, C. R. Bryan, R. G. Kelly, R. F. Schaller
Summary: The influence of cyclic exposure environment on pitting corrosion was evaluated on stainless steels 304H, 304, and 316L with different surface roughness. The study found that the cyclic exposure environment did not significantly affect pitting morphology and depth compared to static exposure environments. Cross-hatching was observed in majority of pits for all material compositions and surface finishes, indicating its relationship with the grinding process or material processing. Micro-cracking was observed in pits formed on samples with rough surface finish, suggesting that a low relative humidity and rough surface containing residual stress are necessary for micro-cracking. Various characterization techniques and cross sectioning were employed to assess pitting damage in a qualitative and quantitative manner across all stainless steel compositions and surface finishes.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Review
Chemistry, Physical
Ling Liu, Cuilin Fan, Hongying Sun, Fuxiao Chen, Junqing Guo, Tao Huang
Summary: This paper reviews the development of Alumina-Forming Austenitic (AFA) stainless steel and introduces its characteristics and composition design methods. It analyzes the influence of alloy elements and heat treatment process on the performance of this steel. Additionally, the corrosion resistance, mechanical properties, and creep properties of AFA steel are analyzed, and future research directions are explored.
Article
Electrochemistry
M. Reisert, M. R. Anisur, L. Lee, A. N. Aphale, J. Hong, M. Yaginuma, T. Shiomi, N. Dale, A. M. Hussain, P. Singh
Summary: The surface morphology and chemistry of oxide scales formed on select chromia-forming and alumina-forming ferritic steels have been studied after exposure to a dual atmosphere of hydrogen and air. Localized Fe-rich oxide nodules with surface whiskers/platelets form at the onset of corrosion. The initiation and growth of localized nodules and breakdown of passivation are attributed to the presence of hydrogen, inclusion of iron oxide in the passivating scale, and subsequent growth of iron-rich oxide due to the establishment of redox (H-2-H2O) atmosphere and modification of oxide defect chemistry.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Lin Shen, Yongning Wang, Tengfei Jing, Huabei Peng, Yuhua Wen
Summary: To understand the differences in oxidation resistance and mechanical properties between Al2O3-forming and SiO2-forming stainless steels, research was conducted on Fe-20Ni-14Cr-3Al-1Nb-0.1C, Fe-20Ni-14Cr-5Si, and Fe-20Ni-14Cr-3Si-1Nb-0.1C steels. The results showed that Fe-20Ni-14Cr-3Si-1Nb-0.1C steel had comparable oxidation resistance to Fe-20Ni-14Cr-3Al-1Nb-0.1C steel at temperatures of 1023-1073 K, but poor resistance at 1123 K. The addition of Nb improved the oxidation resistance in SiO2-forming steels. SiO2-forming steels that were solution-treated and oxidized showed higher ductility but lower yield strength compared to Al2O3-forming steel, which could be attributed to easier twinning and fewer precipitates.
Article
Materials Science, Multidisciplinary
Abdul Azeez Abdu Aliyu, Suparat Udomlertpreecha, Min Medhisuwakul, Chinnapat Panwisawas, Roger Reed, Chedtha Puncreobutr, Jirapon Khamwannah, Surasak Kuimalee, Chetarpa Yipyintum, Boonrat Lohwongwatana
Summary: In this study, a new toxic-free Ti40Zr10Co36Pd14 amorphous alloy was synthesized and fabricated into thin films. The alloy exhibited good biocompatibility and supported the proliferation and differentiation of osteoblast cells.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Coatings & Films
Navnath Kalel, Ashish Darpe, Jayashree Bijwe
Summary: Optimizing the power and duration of plasma exposure can increase the surface energy and lap shear strength of different stainless steels. Argon LPP is more effective than argon-oxygen LPP, and the best results were achieved with a plasma exposure of 500 W power for 20 min.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Engineering, Chemical
Nergizhan Anac, Zekeriya Dogan
Summary: This study investigates the usability of three different organic wastes in abrasive blasting and examines the effect of blasting distance, blasting time, powder type, and grain size on surface roughness. The results show that blasting time has the greatest effect on surface roughness.
Article
Materials Science, Multidisciplinary
Samah A. Al-Shelkamy, Hassan M. Abu Hashish, Amir A. Mahdy
Summary: The study indicates that the heat-treated martensitic stainless steel grade exhibits superior wear resistance and higher hydrophobicity. Factors such as treatment temperature, quenching method, and tempering time during the heat treatment process significantly affect the performance of the stainless steel alloys.
Article
Materials Science, Multidisciplinary
Matthias Bruchhausen, Gintautas Dundulis, Alec McLennan, Sergio Arrieta, Tim Austin, Roman Cicero, Walter-John Chitty, Luc Doremus, Miroslava Ernestova, Albertas Grybenas, Caitlin Huotilainen, Jonathan Mann, Kevin Mottershead, Radek Novotny, Francisco Javier Perosanz, Norman Platts, Jean-Christophe le Roux, Philippe Spatig, Claudia Torre Celeizabal, Marius Twite, Marc Vankeerberghen
Summary: The European INCEFA-PLUS project investigated the fatigue life of austenitic steels and found that mean strain and hold time have minimal impact on fatigue life. An empirical model describing fatigue life was developed, and there were statistically significant interaction effects between surface roughness and the environment, as well as between surface roughness and strain range, though their practical relevance is small.
Article
Chemistry, Physical
Ashwini Patil, Davidson Jebaseelan
Summary: This study investigated the effect of post-fabrication surface treatments on the surface characteristics and mechanical properties of CAD/CAM milled dental zirconia specimens. The results showed that the fabrication processes significantly affected the performance of the specimens, with the specimens that underwent polishing as the last process exhibiting lower surface roughness. The study also identified the critical parameters in the measurement of oral retention and recommended a specific post-fabrication process for better surface properties, mechanical properties, and low wear.
Article
Materials Science, Coatings & Films
S. Bano, A. Rincon Romero, D. M. Grant, A. Nommeots-Nomm, C. Scotchford, I Ahmed, T. Hussain
Summary: ICIE16 and 13-93 bioactive glasses were coated using a high-velocity oxy-fuel thermal spraying technique, with higher flame power resulting in denser, harder, and rougher coatings. The 13-93 coating showed higher stability and cell proliferation in simulated body fluid.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Wisanu Boonrawd, Kamal R. Awad, Venu Varanasi, Efstathios Meletis
Summary: Electrolytic plasma processing (EPP) can create superhydrophilic surface profiles on titanium, enhancing cell adhesion and growth to potentially improve bone implant bonding.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Mohanraj Murugesan, Jae-Hyeong Yu, Kyu-Seok Jung, Sung-Min Cho, Krishna Singh Bhandari, Chang-Whan Lee
Summary: This research aimed to determine the optimal forming parameters using the Taguchi method in order to produce high-quality formed products. The results showed that the vertical step size had the most significant influence on surface roughness, followed by the feed rate and the forming tool radius. The optimal settings were found to be forming tool radius at level 3, spindle speed at level 1, vertical step size at level 1, and feed rate at level 4. Additionally, the response surface methodology was effectively used to predict surface roughness.
Article
Mathematics, Interdisciplinary Applications
Ali Akhavan Farid, Shin Shen Foong, Ondrej Krejcar, Hamidreza Namazi
Summary: The manufacturing industry is increasingly adopting modern manufacturing methods like single point incremental forming (SPIF) due to its rapid prototyping capabilities, ability to form complex geometry with simple steps, and customization for customers. This study explores the impact of forming parameters on the surface structure of aluminum AA6061 sheet and utilizes fractal theory to study the relationship between complexity and roughness of deformed surfaces. The results show variations in complexity and roughness of deformed surfaces with changes in forming parameters, indicating the potential for further application of fractal analysis in investigating processed surface characteristics in manufacturing processes.
FRACTAL AND FRACTIONAL
(2021)
Article
Chemistry, Physical
Fangzhou Song, Takayuki Yamamoto, Takeshi Yabutsuka, Takeshi Yao, Shigeomi Takai
Summary: Lithium ion-conductive composites were prepared by dispersing LLTO particles in a LAGP matrix, leading to increased electrical conductivity. Lithium ions were found to be the predominant charge carrier in this composite electrolyte.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Electrochemistry
Fangzhou Song, Harunobu Onishi, Wen-Jauh Chen, Takeshi Yabutsuka, Takeshi Yao, Shigeomi Takai
Summary: In this study, TEM experiments were conducted on LaPO4-dispersed LATP composite to investigate the microstructure and compositions of the dispersed LaPO4 particles and surrounding LATP matrix. The results revealed an intimate contact between LaPO4 particle and the LATP matrix, suggesting the formation of a space charge layer at the interface to enhance conductivity.
Article
Chemistry, Physical
Fangzhou Song, Masayoshi Uematsu, Takeshi Yabutsuka, Takeshi Yao, Shigeomi Takai
Summary: LATP-based composite electrolytes were prepared by sintering mixtures of LATP precursor and La2O3 nano-powder, which showed that La2O3 could react with LATP to form dispersed LaPO4 particles. The room temperature conductivity initially increased with La2O3 addition but decreased above 6 wt.%, and the activation energy of conductivity remained relatively unchanged. Comparing with LATP-LLTO system, the LATP-La2O3 system achieved fine dispersion of LaPO4 particles despite a slight reduction in conductivity due to unidentified impurities.
Article
Electrochemistry
Shigeomi Takai, Ryo Takemoto, Takeshi Yabutsuka, Takeshi Yao
Summary: To investigate the influence of defect structure on oxide ion conduction properties in CaWO4-based system, cesium and lanthanum ions were doped into CaWO4. The results showed that the structure and phase transition of the solid solution varied in different composition regions, which affected the conductivity. The study revealed that high-temperature oxide ion conduction was attributed to both oxide ion vacancies and interstitials.
Article
Chemistry, Physical
Yuya Yamane, Takeshi Yabutsuka, Yusuke Takaoka, Chihiro Ishizaki, Shigeomi Takai, Shunsuke Fujibayashi
Summary: The study aimed to enhance the apatite-forming ability of 50% carbon fiber-polyetheretherketone composite (50C-PEEK) as artificial bone materials, achieving rapid formation of apatite phase in simulated body fluid through sulfuric acid treatment, oxygen plasma treatment, and calcium phosphate nuclei precipitation in modified-SBF solution.
Article
Chemistry, Physical
Fangzhou Song, Heng Chen, Hirotoshi Hayashida, Tetsuya Kai, Takenao Shinohara, Takeshi Yabutsuka, Takeshi Yao, Shigeomi Takai
Summary: Lithium tracer diffusion coefficients were measured in LATP and LATP-LaPO4 composite solid electrolytes, indicating that bulk diffusion becomes the dominant mechanism at 300℃ to 500℃.
SOLID STATE IONICS
(2022)
Article
Multidisciplinary Sciences
Yusuke Takaoka, Shunsuke Fujibayashi, Takeshi Yabutsuka, Yuya Yamane, Chihiro Ishizaki, Koji Goto, Bungo Otsuki, Toshiyuki Kawai, Takayoshi Shimizu, Yaichiro Okuzu, Kazutaka Masamoto, Yu Shimizu, Makoto Hayashi, Norimasa Ikeda, Shuichi Matsuda
Summary: Sulfonation and applications of amorphous calcium phosphate can enhance the bioactivity of polyetheretherketone (PEEK). The precipitation of amorphous calcium phosphate after sulfonation (AN-treatment) can further improve the bone-bonding strength of PEEK. The study found that CPEEK subjected to AN-treatment had better bone-bonding strength at the interface with the base material compared to untreated CPEEK. AN-treatment promoted the formation of new bone, resulting in enhanced bonding between CPEEK and bone tissue.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Multidisciplinary
Hayato Nakaishi, Takeshi Yabutsuka, Takeshi Yao, Shinji Kitao, Makoto Seto, Wen-Jauh Chen, Yuta Shimonishi, Shuhei Yoshida, Shigeomi Takai
Summary: We characterized a mechanically alloyed (Fe2O3)1-x(Al2O3)x solid solution with corundum-type structure using TEM, EXAFS, and Mössbauer spectroscopy. The results showed the homogeneity of cation distribution and the variation of magnetic property with composition. HR-TEM revealed that the crystallite size of the solid solution is 10-20 nm and the lattice spacing is consistent with Vegard's law. EXAFS measurements indicated a monotonic decrease in Fe-Fe distance with aluminum substitution, while Fe-O was not significantly altered. Mössbauer spectroscopy showed a gradual change in spectra from sextet peaks at x = 0 to doublet with increasing Al2O3 concentration up to x = 0.67, suggesting homogeneous substitution of aluminum ions in the corundum-type structure.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Kenshiro Takaishi, Shigeomi Takai, Takeshi Yabutsuka
Summary: Octacalcium phosphate (OCP) coating was formed on the surface of Mg-Al-Zn-Ca alloy (AZX612) through anodic oxidation and subsequent immersion in a supersaturated aqueous solution containing phosphate and calcium ion. The formed OCP layer consists of an inner layer of fine crystallites and an outer layer of large crystallites, and the inner layer remains on the alloy even after ultrasonication process. AZX612 treated with both anodic oxidation and subsequent OCP coating process exhibits higher corrosion resistance than those treated with only anodic oxidation.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2022)
Article
Materials Science, Ceramics
Takeshi Yabutsuka, Masaya Yamamoto, Shigeomi Takai
Summary: This study aimed to establish enzyme immobilization technology using maghemite/hydroxyapatite composite particles and investigate the enzyme adsorption characteristics. The results showed that the enzyme's isoelectric point and the solution's pH influenced the immobilization. The interaction between HA on the composite particles and the adsorbed enzymes was strongest when pH-pI was 1-2.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2022)
Article
Materials Science, Ceramics
Shigeomi Takai, Yoshinobu Tawa, Masashi Takemoto, Jian Kang, Takeshi Yabutsuka, Takeshi Yao
Summary: LiMn2O4 was prepared by high-energy ball-milling and one-pot sintering, with optimized milling time leading to enhanced cathode performance and reduced structural changes during charging, thus improving cycle performance.
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
(2021)
Article
Electrochemistry
Jian Kang, Shigeomi Takai, Takeshi Yabutsuka, Takeshi Yao
Summary: The structural variation of NCM-811 during lithium extraction to the high-voltage region shows the generation and transformation between H3 and H2 phases. The Ni interlayer distance decreases with relaxation time, possibly due to an increase in the valence of Ni.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
