Article
Nanoscience & Nanotechnology
D. Schimbaeck, P. Mair, M. Baertl, F. Palm, G. Leichtfried, S. Mayer, P. J. Uggowitzer, S. Pogatscher
Summary: To fully exploit the potential of additive layer manufacturing, adapting materials to the process via smart alloy design is necessary. Different microstructural evolutions were studied in Sc-modified Al alloys with the addition of Mg, Cr, or Ti as main elements. The differences in microstructures arise from interactions of grain growth restriction factors and solute with the primary precipitation structure.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Lili Zhang, Hongxiang Jiang, Jie He, Jiuzhou Zhao
Summary: This study proposes a method for improving grain refinement in aluminium alloys through re-precipitated TiB2 particles.
Article
Nanoscience & Nanotechnology
X. Wang, W. Zhai, J. Y. Wang, B. Wei
Summary: The solidification process of high-entropy FeCoNi2Al0.9 alloy was modulated using 20 kHz power ultrasound with a maximum amplitude of 13 μm. The eutectic structures were composed of L12 and B2 phases growing synergistically by the K-S relationship. Increasing the ultrasound amplitude resulted in refined eutectic cell width and regular lamellar spacing, increased proportion of strictly semi-coherent L12/B2 interfaces, and suppressed solute concentration fluctuation in each eutectic phase. The steady-state cavitation and acoustic flow had a significant influence on the evolution of the eutectic microstructure. The alloy exhibited increased yield strength, ultimate strength, and total elongation compared to statically solidified alloy, providing an effective approach to improve the mechanical properties and overcome the strength-ductility trade-off in high-entropy alloys with eutectic structures.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
A. Zafari, K. Xia
Summary: A nano/ultrafine grained immiscible Fe-Cu alloy with Cu particles of 5 nm in size and 10 nm in spacing was produced by SLM, leading to an ultrahigh strength material. The significant increase in yield strength from approximately 400 MPa in SLM-fabricated Fe to approximately 900 MPa in Fe-Cu was attributed to dispersion strengthening and grain boundary strengthening.
MATERIALS RESEARCH LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Lei Wang, Dong -Rong Liu, Tian Chen, Shaofan Wang, Yang Cao
Summary: Adding low-cost aluminum element to Mg-RE alloy can significantly refine the grain structure in the laser surface remelting process and improve the thermal stability by forming nanoscale intermetallic compounds.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Arnold Ronafoldi, Zsolt Veres, Maria Sveda, Andras Roosz
Summary: The mechanical properties of solidified alloys are greatly influenced by the grain size. The microstructure of the solidified material is usually columnar, resulting in directional differences in mechanical properties. Grain refinement materials can change the microstructure from columnar to equiaxed. However, in some cases, stirring the melt can achieve similar effects without using grain refinement materials. This study presents a new type of inductor that generates strong shearing stress in the melt flow, promoting equiaxed grain structure during solidification.
Article
Nanoscience & Nanotechnology
Xin Tong, Guohua Wu, Mark A. Easton, Ming Sun, David H. StJohn, Rui Jiang, Fangzhou Qi
Summary: The distribution of Zr in a commercial Mg-30Zr master alloy can be modified through tungsten inert gas arc re-melting with ultra-high frequency pulses, leading to a substantial reduction in grain size. The approach allows for refinement of Zr particle size and obtaining higher contents of soluble Zr and nanoscale Zr particles. This new method proposes a new approach to the design and fabrication of high-efficiency grain refiners.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Jiangwei Liu, Yafang Wu, Sindo Kou
Summary: Computational fluid dynamics was used to study the role of solidification shrinkage and transverse tension in solidification cracking, showing that both factors can play a significant role depending on the strain rate.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2021)
Article
Engineering, Manufacturing
G. Del Guercio, D. G. McCartney, N. T. Aboulkhair, S. Robertson, R. Maclachlan, C. Tuck, M. Simonelli
Summary: This study provides a detailed investigation of crack formation in the AlCuMg alloy AA2024 during laser powder bed fusion (L-PBF) process. Through microstructural characterization, hot cracks and solid state cracks were differentiated and a modeling approach was proposed to predict the susceptibility of hot cracks based on solidification velocities. The observation of cracks associated with microporosity offers new insights into the complex problem of hot tearing during L-PBF.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Xinwei Li, Gan Li, Ming-Xing Zhang, Qiang Zhu
Summary: The study focused on the development and application of a hybrid grain refiner for high-strength aluminum alloys fabricated by LPBF. By adding a Ti/TiN hybrid grain refiner, ultrafine grains were achieved, significantly enhancing the mechanical properties of the aluminum alloys.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Jianyue Zhang, Guanyu Zhou, Bin Jiang, Alan Luo, Xuzhe Zhao, Aitao Tang, Fusheng Pan
Summary: The novel grain refinement method using a CaMgSn intermetallic phase was found to effectively reduce the average grain size in AZ31 magnesium alloy, improving microhardness and compressive yield strength. The added CaMgSn particles acted as heterogeneous nucleation sites in the grain interiors, contributing to the refinement of microstructure and mechanical properties of Mg-Al-based alloys.
Article
Materials Science, Multidisciplinary
Feng Wang, Yu-Lung Chiu, Dmitry Eskin, Wenjia Du, Paul R. Shearing
Summary: The study found that the addition of vanadium can cause grain refinement of cast commercial purity aluminium, mainly due to the high nucleation potency and sufficient growth restriction effect of Al10V particles. In addition, the relatively large size of Al10V particles helps to promote the nucleation of aluminium grains.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Cezary Rapiejko, Dominik Mikusek, Bartlomiej Januszewicz, Krzysztof J. J. Kubiak, Tadeusz Pacyniak
Summary: The microstructure of AZ91 magnesium-aluminium alloy was refined by inoculating with zirconium. A zirconium content concentration of 0.3 wt% resulted in shortened solidification time and further refinement of the microstructure.
Review
Engineering, Manufacturing
Zhen Xiao, Wenhui Yu, Hongxun Fu, Yaoji Deng, Yongling Wu, Hongyu Zheng
Summary: This review provides an in-depth insight into laser powder bed fusion (LPBF) technology and its applications with aluminium alloys. It discusses the influence of thermal dynamics on microstructure in LPBF and summarizes the methods to refine microstructures in LPBF fabrication of various aluminium alloys. The review concludes with a summary of microstructural control and an outlook on the challenges and potential research topics in LPBF with Al alloys.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Chemistry, Physical
Olaf Kessler, Evgeny Zhuravlev, Sigurd Wenner, Steffen Heiland, Mirko Schaper
Summary: The study on high-strength aluminium alloy powders modified with different nanoparticles by ball milling during rapid solidification reveals that the introduction of nanoparticles can reduce solidification undercooling, resulting in less hot cracking and smaller grain sizes in the material.
Article
Materials Science, Multidisciplinary
Reza Haghayeghi, Giulio Timelli
Summary: The experimental results indicate that stacking fault and kinks, in addition to twinning, contribute to primary Si refinement in A390 hypereutectic Al alloy. The type of alloying element determines the major contributing mechanism in primary Si evolution. Furthermore, the kink formation and its effect on primary Si refinement has yet been reported elsewhere.
Article
Materials Science, Multidisciplinary
Luis Vanderlei Torres, Marcos Antonio Naldi, Eugenio Jose Zoqui
Summary: This study analyzed the semi-solid behavior of commercial 332 aluminum alloy during thixoforming, including the solid-liquid transition, heating and holding at temperature, and microstructure characterization. The thixoforged alloy with the lowest fraction solid exhibited the most refined structure and excellent mechanical properties, indicating great potential for thixoforming and rheocasting applications.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Daimer Velazquez Tamayo, Gabriela Lujan Brollo, Juliana Rodrigues de Oliveira, Fabio Miani, Eugenio Jose Zoqui
Summary: This study analyzed the effects of Si content, heating rate, and sample mass on the determination of the thixoforming working window by DSC for the AlXSi4Zn system. Lower Si content, heating rate, and DSC sample mass led to more accurate temperature identification, aligning better with thixoforming operation conditions. For alloys with high Si content, lower DSC sample masses and heating rates were recommended for more precise determination.
Article
Materials Science, Multidisciplinary
Luis Vanderlei Torres, Eugenio Jose Zoqui
Summary: This study investigates the microstructural stability and rheological behavior of Al-Si-Cu alloys in the semi-solid state. It found that alloys reheated to a 45% solid fraction exhibited the best rheological behavior, but the viscosity increased rapidly for strains between 65% and 80%.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Mechanics
L. Chen, H. Bahai, G. Alfano
Summary: Powell-Sabin B-splines, based on triangles, are used in the extended finite element method (XFEM) for fracture analysis. They avoid the need for remeshing and improve the accuracy around the crack tip. The approach captures stress around the crack tip more accurately and maintains C1 continuity throughout the entire domain.
ENGINEERING FRACTURE MECHANICS
(2022)
Review
Chemistry, Analytical
Benedict Marsh, Abdul Hamid Sadka, Hamid Bahai
Summary: This review provides a detailed coverage of multi-sensor fusion techniques that utilize RGB stereo images and sparse LiDAR-projected depth map as input to generate dense depth map predictions. State-of-the-art fusion techniques, which are predominantly deep learning-based and end-to-end trainable, are covered. A comparative evaluation of these techniques is conducted, along with a detailed analysis of their strengths, limitations, and applications.
Article
Metallurgy & Metallurgical Engineering
Luis Vanderlei Torres, Eugenio Jose Zoqui
Summary: This study evaluates the microstructure and mechanical behavior of Al-Si-Cu alloys through thixoforging. The alloys were subjected to controlled partial melting and then immediately thixoforged. Tensile testing and heat treatment were conducted to characterize the mechanical properties and improve the alloy's performance.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Chemistry, Physical
C. Chen, J. Xia, Q. Martinez, X. Jiang, H. Bahai
Summary: Molecular dynamics simulation was used to investigate the morphology of dodecane in a nanopore at typical temperatures in exploited or depleted oil reservoirs. The results suggest that the morphology of dodecane is influenced by the interactions between interfacial crystallization and surface wetting of the simplified oil. The presence of water or CO2 in the nanopore also affects the morphology of dodecane, with water impeding the spreading of dodecane molecules and CO2 acting as an efficient solvent for dodecane.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Gabriela Lujan Brollo, Cecilia Tereza Weishaupt Proni, Eugenio Jose Zoqui
Summary: The effect of heat and strain during the semisolid processing route on the microstructural evolution and mechanical performance of the Al-5.5wt%Si-5wt%Zn-0.2wt%Mg alloy was evaluated. The solution heat treatment (SHT) for 2.5 hours after thixoforming was found to be adequate, as it resulted in the spheroidization of Si crystals, formation of Fe-and Mn-rich platelet-like particles, dissolution of Mg from Mg2Si conglomerates, and homogeneous diffusion of Zn along the entire part. These factors minimized the possibility of crack formation and propagation under stress and increased the alloy's mechanical strength and hardness.
MATERIA-RIO DE JANEIRO
(2022)
Article
Metallurgy & Metallurgical Engineering
R. Haghayeghi
Summary: A new rotary degassing-ultrasound system has successfully demonstrated a more efficient hydrogen removal and inclusion reduction compared to the traditional Impeller+N-2 system. The method shows improved bubble removal and inclusion elimination effects.
METALLURGIA ITALIANA
(2022)
Proceedings Paper
Electrochemistry
Reza Haghayeghi, Giulia Scampone, Ozen Gursoy, Giulio Timelli
Summary: This study examined the effect of casting temperature and iron content on the microstructure of A380 aluminium alloy. The results showed that the dendrite arm spacing was not significantly affected by the different casting temperatures or iron contents. Furthermore, it was found that the precipitation of harmful beta-phase was suppressed above certain temperatures, and the dominant phase in the microstructure changed to blocky or Chinese script alpha-Fe compounds. Lower iron content and a casting superheat of 100 degrees C were found to result in a uniform microstructure and removal of detrimental beta-phase.
Article
Materials Science, Multidisciplinary
Wendel Leme Beil, Gabriela Lujan Brollo, Eugenio Jose Zoqui
Summary: This study investigates the design, construction, and testing of a continuous casting device coupled with an electromagnetic stirring system for producing Al-Si thixoforming feedstock. Results show that surface finish of the mold cavity significantly impacts heat transfer and feed speed, while the use of a secondary cooling system allows for greater grain refinement and microstructural homogeneity. Optimal electromagnetic stirring power is found to be 1500 W, resulting in suitable grain size-to-dendritic arm spacing ratio for subsequent processing.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Luis Vanderlei Torres, Eugenio Jose Zoqui
Summary: The microstructural analysis of AA7004 and AA7075 aluminum alloys in semi-solid conditions showed that a 45% solid fraction led to better surface finish and shaping results compared to 60% solid fraction, due to stronger microstructure bonds requiring more tension for forming. This study also revealed the presence of globular morphology in the edge region of the samples and fully deformed grains in the central region, indicating different behaviors in different areas of the samples during thixoforming processes.
MATERIA-RIO DE JANEIRO
(2021)
Article
Materials Science, Multidisciplinary
Luis Vanderlei Torres, Eugenio Jose Zoqui
MATERIA-RIO DE JANEIRO
(2020)
Article
Materials Science, Multidisciplinary
Andre Victor Rodrigues Dantas, Gabriela Lujan Brollo, Daimer Velasquez Tamayo, Eugenio Jose Zoqui
Summary: In this study, the suitability of Al-5wt%Si-5wt%Zn-0.5wt%Mg alloy for thixoforming was evaluated through thermodynamic characterization, microstructural evolution analysis, and rheological behavior analysis. The findings show that the alloy is suitable for use in semisolid processing.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2021)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
