Article
Chemistry, Physical
Mustafa Tekin, Gokhan Polat, Y. Eren Kalay, Hasan Kotan
Summary: Nanocrystalline CoCrFeNi high entropy alloys with 1 and 4 wt% nanosized Y2O3 were synthesized and annealed at different temperatures. The addition of Y2O3 nanoparticles improved the grain size stability and hardness of CoCrFeNi at high temperatures, showing potential for enhancing its mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Peng Zhang, Boyang Xu, Jianquan Zhao, Shengming Yin, Youwei Yan, Mi Zhao
Summary: Mechanical alloying (MA) is used to prepare two types of ODS ferritic alloys, labeled A and B, for potential use in fusion reactors. The use of TiO2 powder instead of traditional Y2O3 powder reduces milling time and results in the formation of nanoparticles with coherent interfaces. This study provides a new route for the efficient fabrication of ODS alloys.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Tianxing Lu, Cunguang Chen, Pei Li, Chenzeng Zhang, Weihao Han, Yang Zhou, Challapalli Suryanarayana, Zhimeng Guo
Summary: A novel dispersion-strengthened copper-tungsten alloy was prepared by mechanical alloying, showing improved mechanical properties, electrical conductivity, and thermal stability. The cold-rolled Cu-5 vol% W alloy retains high tensile strength and reasonable ductility even after annealing at 800 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
S. Ganesh, P. Sai Karthik, M. Ramakrishna, A. Reddy, S. B. Chandrasekhar, R. Vijay
Summary: In this study, nitrogen-containing and nickel alloyed austenitic oxide dispersion strengthened steel was produced through ball milling and hot extrusion, resulting in a fully homogenous austenitic phase with ultrafine grain size and bimodal distribution. The processed steel exhibited high yield strength and fracture strain at room temperature, attributed to grain boundary and Orowan strengthening mechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Mi Zhao, Boyang Xu, Peng Zhang, Junjie Xu, Yong Jiang, Feng Liu, Youwei Yan
Summary: A Y-Ti-O oxide-dispersion-strengthened (ODS) Cu alloy was successfully fabricated through mechanical alloying and spark plasma sintering. The optimization of raw powder composition and ball-milling time allowed for the high density precipitation of ultra-fine Y-Ti-O nano-oxides. However, further improvement is needed for the dispersion of nano-oxides.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Liying Yao, Yimin Gao, Yefei Li, Xiaoyu Huang, Yiran Wang, Yijie Huang
Summary: The nanostructural oxide dispersion strengthened (ODS) Mo alloy was successfully fabricated through mechanical alloying and spark plasma sintering. The study found that the mechanical alloying process refines the powder and promotes the dissolution of interstitial atoms, but introduces impurities. The optimized spark plasma sintering parameters resulted in high relative density and improved mechanical properties.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Won-Sang Shin, Sung-Il Baik, David N. Seidman, Kee-Ahn Lee, Changkyoo Park, Yoon-Jun Kim
Summary: Oxide-dispersion-strengthened steel was prepared by mechanical alloying and the oxidation behavior at different temperatures was investigated. The oxidation kinetics were found to be influenced by different nano-precipitates, and Y atoms played a crucial role in clustering and segregation at interfaces.
Article
Engineering, Chemical
Lekhraj Verma, Vikram V. Dabhade
Summary: In this study, ferritic steels strengthened with uniformly dispersed oxides (ODS steel) were synthesized using mechanical alloying. The structural evolution occurring during the mechanical alloying process was investigated using various techniques. It was found that complete solid solution formation occurred after 10 hours of milling, with the dissolution of Cr and W in the ODS steel.
Article
Nanoscience & Nanotechnology
X. C. Cai, J. J. Liang, L. D. Xu, B. R. Sun, Z. Chen, K. K. Wen, S. B. Jin, G. Sha, T. D. Shen
Summary: A novel Zr-doped nanocrystalline 14YWTZ ferritic ODS alloy was prepared with high consolidation pressure, exhibiting ultra-high compressive yield strength and exceptional thermal stability. After hot rolling, the alloy retains nanocrystalline microstructures and demonstrates an unprecedented tensile yield strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Shengxi Wang, Lin Zhang, Ye Liu, Yan Chen, Xiaowei Chen, Zhenhuan Gao, Xuanhui Qu
Summary: The study found that in the aging process of a mechanically alloyed ferritic oxide dispersion strengthened alloy, the size and morphology of B2-NiAl nano-precipitates change, and the aging resistance of nano-precipitates is consistent with the LSW theory.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Zheng Lu, Shibo Peng, Hui Li, Shang Gao
Summary: Isothermal oxidation tests were conducted on four types of oxide dispersion strengthened (ODS)-CrFeNi medium entropy alloys with different Y2O3/Ti/Zr additions. The results showed that the best oxidation resistance was observed in the 1YZ alloy, which had a very dense oxide layer with minimal changes in thickness. In contrast, the 1YTZ alloy exhibited the worst oxidation resistance with a thick oxide layer filled with pores and microcracks. The addition of Zr in the 1YZ alloy resulted in the formation of thermodynamically stable oxides, leading to excellent oxidation tolerance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Metallurgy & Metallurgical Engineering
Wenquan Ding, Jieli Ma, Yong Jiang, Yiren Wang, Huiqun Liu
Summary: A new Ni + Zr co-alloyed FeCrAl-ODS ferritic alloy was fabricated by ball-milling and hot-isostatic-pressing. The formation of high density core-shelled nano-particles of various sizes with a common B2-NiAl shell was confirmed. These nano-phases were highly coherent with the ferritic matrix, leading to an excellent combination of strength and ductility at high temperatures.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Rajesh Jarugula, Samartha Channagiri, S. Ganesh Sundara Raman, G. Sundararajan
Summary: The study evaluates the isothermal uniaxial compressive deformation behavior of n-ODS-18Cr steel across a range of temperatures and strain rates, identifying different deformation mechanisms governing yield strength and their quantified contributions. Transmission electron microscopy analysis confirms the interaction between dislocations and nanoprecipitates in deformed samples, without significant changes in grain size or nanoprecipitate size.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Caleb P. Massey, Philip D. Edmondson, Maxim N. Gussev, Keyou Mao, Tim Graning, Thomas J. Nizolek, Stuart A. Maloy, Denis Sornin, Yann de Carlan, Sebastien N. Dryepondt, David T. Hoelzer
Summary: Two oxide dispersion strengthened (ODS) alloys were developed and evaluated for advanced nuclear fuel claddings. The alloys exhibited high tensile strength and reasonable plastic strains. The manufacturing process using pilgering technique was successful in producing thin-walled tubes with matching microstructures and precipitate characteristics. Further optimization of models is needed to accommodate the anisotropic microstructures associated with rolling/pilgering approaches.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
R. Lawitzki, D. Beinke, D. Wang, G. Schmitz
Summary: This experimental study focuses on the characterization of hyperfine NiAltype precipitates in ferritic superalloys, with electron microscopy and atom probe tomography used to obtain size, crystallographic information, and chemical nature of the precipitates. A modified version of the maximum separation method for cluster selection is proposed for identifying the hyperfine precipitates in atom probe tomography reconstructions, allowing for precise localization without requiring user defined parameters. The formation of precipitates during sample cooling is shown to be a kinetically controlled process dominated by two different mechanisms depending on the temperature.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Ceramics
Ramon Cobo Rendon, R. Udayabhaskar, Christopher Salvo, Erwin Sepulveda, Jose Jimenez Rodriguez, Carlos P. Camurri, Mangalaraja Ramalinga Viswanathan
Summary: The La0.8Sr0.2MnO3 (LSM) perovskite as oxygen electrode material was synthesized by the fast solution combustion method and the subsequent calcination had an influence on the material's crystal phase, grain size, hardness, porosity, and conductivity.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Antonio Hernando, Miguel Angel Cobos, Jose Antonio Jimenez, Irene Llorente, Asuncion Garcia-Escorial, Patricia de la Presa
Summary: Studies in the past three decades have revealed an anomalous behavior in the magnetic susceptibility of spinel ZnFe2O4 ferrite. This study finds that the presence of a small percentage of Fe atoms in tetrahedral sites leads to the formation of ferrimagnetic clusters, which exhibit superparamagnetism and contribute to the abnormal Curie-Weiss behavior.
Article
Materials Science, Multidisciplinary
Ana Crespo, Gloria Perez, Jose A. Jimenez, Irene Llorente, Sagrario Martinez-Ramirez, Emilio Cano, Ivan Diaz
Summary: Weathering steels are commonly used in various fields due to their mechanical properties, resistance to corrosion, and aesthetic properties. An experiment was conducted to compare the colors and surface evolution of accelerated and natural patinas. The results showed that the colors of the accelerated patinas differed from the natural patina at short exposure times but converged at longer exposure times.
Article
Materials Science, Ceramics
Erwin Sepulveda, R. Mangalaraja, R. Udayabhaskar, Ramon Cobo, Maria Escudero Berzal, Jose Jimenez, Christopher Salvo, Carlos P. Camurri
Summary: In this study, La1 - xSrxGa1-yMgyO3 (LSGM) samples with different compositions and sintering temperatures were prepared by the fast combustion method. The electrical properties of LSGM were evaluated, and it was found that LSGM can exist in two different crystal phases simultaneously. The sintering temperature and composition of the samples were found to have an influence on the conductivity.
JOURNAL OF ELECTROCERAMICS
(2022)
Article
Thermodynamics
M. Morawiec, J. Opara, C. Garcia-Mateo, J. A. Jimenez, A. Grajcar
Summary: This work provides insights into the influence of manganese on the driving force and kinetics of bainite transformation. The study shows that increasing manganese content leads to a lower fraction of bainite formed during the isothermal stage and longer incubation and transformation time.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Nanoscience & Nanotechnology
Adam Skowronek, Erick Cordova-Tapia, Pilar Tobajas-Balsera, Carlos Garcia-Mateo, Jose A. Jimenez, Roumen Petrov, Adam Grajcar
Summary: The novel use of double austempering treatments in a multiphase steel has been studied to refine and homogenize the microstructure and improve material strength. The two-step heat treatments effectively reduced blocky-type austenite and fresh martensite while retaining a high volume fraction of retained austenite. The microstructural characteristics, including reduced bainitic plate thickness and film-like retained austenite, led to a significant increase in hardness (50 HV) and yield strength (180 MPa).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Li Ma, Naiyou Xiao, Tao Jia, Jose A. Jimenez, Xiuhua Gao
Summary: The effect of processing route on the microstructure and tensile behavior of a V-microalloyed medium-Mn steel has been analyzed. The balance between different phases was found to be the most important factor affecting the strength and ductility of the steel. The presence of fresh martensite increased the strength of hot-rolled samples, while the presence of retained austenite improved the total elongation to failure of warm-rolled samples. The WRA sample showed optimal mechanical properties, with a yield strength of 808 MPa and an ultrahigh product of strength and elongation.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Multidisciplinary Sciences
Adriana Eres-Castellanos, Ana Santana, David De-Castro, Jose Antonio Jimenez, Rosalia Rementeria, Carlos Capdevila, Francisca G. Caballero
Summary: This study investigates the properties of a 300 maraging steel processed under different conditions using LPBF. The results show that the heat treatment intrinsic to the LPBF process does not affect the texture and morphology of the prior austenite grains. The microstructure texture is not related to the powder layer thickness or the laser emission mode, but it could be affected by the laser power or the scan strategy.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Adriana Eres-Castellanos, Ana Santana, Luis Miguel Sanz-Moral, Rosalia Rementeria, Rebeca Hernandez Pascual, Marta Serrano, Isaac Toda-Caraballo, Jose A. Jimenez, Francisca G. Caballero, Carlos Capdevila
Summary: This study evaluated the effects of adding TiC nanoparticles on the microstructure and high temperature behavior of Grade 316 L stainless steel. The results showed that TiC nanoparticle inoculation did not alter the solidification structure and grain size, but it did modify the material's texture. Additionally, dispersion hardening improved the ductility, yield strength, and ultimate tensile strength of 316 L steel at high temperature.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nuclear Science & Technology
Elvira Onorbe, Mercedes Hernandez-Mayora, Rebeca Hernandez, Marta Serrano
Summary: This study investigates the thermal stability of a 9Cr-1Mo ferritic/martensitic steel before and after thermomechanical treatment. The results show that the material after thermomechanical treatment has a more stable microstructure compared to the as received material.
NUCLEAR MATERIALS AND ENERGY
(2022)
Article
Chemistry, Physical
Ramon Cobo Rendon, Christopher Salvo, Erwin Sepulveda, Arunachalam Arulraj, Felipe Sanhueza, Jose Jimenez Rodriguez, Ramalinga Viswanathan Mangalaraja
Summary: A series of La0.6Sr0.4MnO3 (LSM) perovskite was synthesized using the rapid solution combustion method and calcined at different temperatures. The calcination temperature was found to affect the microstructural, morphological, compositional, optical, and electrical properties of the nanopowders produced. With increasing calcination temperature, the average grain size and hardness increased, while the apparent porosity and resistivity decreased. The optical characterization revealed specific absorption and bandwidth characteristics.
Article
Materials Science, Multidisciplinary
Adam Skowronek, Adam Grajcar, Carlos Garcia-Mateo, Jose A. Jimenez, Roumen H. Petrov
Summary: The present study explores the possibility of using continuous annealing approach in Al-alloyed 5Mn steel to optimize the superior mechanical properties in medium-Mn. The microstructural changes as a function of time were followed by dilatometric studies at 680 oC with different soaking times, and thoroughly characterized using various techniques. It was observed that with increasing soaking times, the volume fraction of retained austenite gradually increases, but at the cost of its stability. Mechanical tests results showed a decrease in yield stress, tensile strength and hardness with increasing intercritical annealing soaking time.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Ana Santana, Adriana Eres-Castellanos, Jose Antonio Jimenez, Rosalia Rementeria, Carlos Capdevila, Francisca G. Caballero
Summary: In this study, laser powder bed fusion was used to process a high-performance maraging steel M300 with modified layer thickness and laser emission mode. The metallurgical phenomena during printing, including melting of deposited material, rapid solidification, and martensite-to-austenite reversion and intermetallic phase precipitation induced by heating and cooling cycles, were studied. Aging treatments were applied to the printed parts, and microstructural characterization showed the importance of layer thickness in modifying the solidification cell size. The study also found that the printing parameters had no significant effect on the microstructure evolution during aging, and the hardness of aged microstructures was comparable to that obtained by conventional manufacturing methods.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
