Article
Nanoscience & Nanotechnology
Yunjie Li, Linlin Li, Jian Kang, Ningtao Niu, Han Xi, Yi Liu, Guo Yuan, Guodong Wang
Summary: By employing a compositionally lean alloy design and strain-aging processing route, medium Mn steels have achieved unprecedented yield strengths of 2.0-2.3 GPa and uniform elongations of 8-14%.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Mechanical
Jiapeng Zheng, Gongbin Tang, Fenghua Su, Tao Li, Zhongwei Liang, Xiaochu Liu
Summary: In this study, a novel strengthening grinding treatment (SGT) method was used to fabricate a gradient nanostructure layer with alpha-Al2O3 particles on aluminium alloy, which effectively enhances its wear resistance. The presence of alpha-Al2O3 in the nanostructure restricts shear deformation and crack generation, and the formation of a wear-resistant tribofilm during friction contributes to further wear reduction.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Xiaofei Cui, Wei Fu, Daqing Fang, Guangli Bi, Zijun Ren, Shengwu Guo, Suzhi Li, Xiangdong Ding, Jun Sun
Summary: Grain boundary precipitation and segregation play a crucial role in determining the mechanical properties of Mg alloys. Coarse-grained alloys are strengthened through precipitation, while fine-grained alloys are strengthened through segregation and precipitation, exhibiting a heterogeneous transition from elastic to plastic deformation. The insights provided in this study contribute to the design of Mg alloys with improved mechanical properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Polymer Science
Suparna Khatun, Anurag Singh, Kumari Shikha, Agneyo Ganguly, Amar Nath Gupta
Summary: The role of dextran in compacting plasmids was explored using laser light scattering experiments. Two different compaction regimes were observed, and the conformational changes of plasmids were found to depend on the size of the dextran.
Article
Materials Science, Multidisciplinary
Zhipeng Yuan, Yiyou Tu, Ting Yuan, Yaohua Huang, Yunhe Zhang
Summary: The local electrochemical measurements and corrosion mechanisms of multi-layered aluminium sheets after brazing were determined using mechanical polishing and work function calculations based on density functional theory. It was found that Si and α-Al(Fe,Mn)Si particles in the sheets promoted cathodic reactions and could lead to localized dissolution of the Al matrix. Additionally, the presence of the sacrificial AA7072 layer reduced copper diffusion and improved corrosion protection due to its large potential difference with the core material.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Tin Brlic, Tomaz Rodic, Ivan Samardzic, Marijan Marcius, Milos Matvija, Stoja Reskovic
Summary: This paper focuses on the influence of the microstructure on the formation of Luders bands in niobium microalloyed steel, and experiments were conducted using thermography and digital image correlation techniques. The changes in temperature, stress, and strain in different areas of the deformation zone were found to be closely related to changes in the microstructure. The results provide insights into the effect of microstructural parameters on Luders band formation.
Article
Chemistry, Multidisciplinary
Matteo Bruno, Luca Esposito, Gianluca Iannitti, Fabio Scherillo
Summary: The discontinuous yielding behavior of Fe E420 steel was investigated through tensile tests on laminated sheets. Both quasi-static and dynamic loading conditions were considered with three nominal strain rates. Heat treatment on the material was also analyzed. The post failure fracture surfaces were examined using scanning electron microscopy technique.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Surajit Kumar Paul
Summary: In this study, a physics-based defect tolerant design approach is used to calculate the uniaxial tensile performance of cast ADC12 Aluminum alloys. The proposed model demonstrates the correlation between tensile ductility and the dimensions of material defects.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Thermodynamics
G. K. Ramesh, J. K. Madhukesh, B. C. Prasannakumara, G. S. Roopa
Summary: This study investigates the heat and mass transfer of a hybrid nanofluid between parallel plates, taking into account chemical reactions, activation energy, and heat source/sink effects. The results show that chemical reaction values and activation energy have different effects on concentration curves, while heat source/sink parameters influence heat transport and drag friction. The hybrid nanofluid AA7072-AA7075/water is found to be more efficient than AA7072/water, which could have practical applications in various fields such as piston motion, chocolate filling, power transfer, and compression.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Mechanics
Susanne Thomesen, Asle J. Tomstad, Tore Borvik, Odd Sture Hopperstad
Summary: This study investigates the ductile fracture of two high-strength aluminium alloys in temper T6 using heuristic extensions of the Gurson model with non-quadratic yield criteria. The simulations show that the Gurson model's heuristic extensions provide accurate predictions of tensile ductility for the two alloys under different processing conditions.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Jin Liu, Zhiyong Du, Jinlong Su, Jie Tang, Fulin Jiang, Dingfa Fu, Jie Teng, Hui Zhang
Summary: The quenching-induced residual stress in ultrahigh strength Al-Zn-Mg-Cu alloys significantly affects the precipitation behavior during subsequent heat treatment and the properties of the final products. This study investigated the effects of quenching residual stress on the precipitation behavior of 7085 Al alloy through various methods, including finite element analysis and microstructural examinations. The results revealed that the reduction in residual stress increases with the increase in cladding layer thickness, and the residual stress has a significant impact on the hardness distribution. The elastic lattice distortion caused by residual stress was found to promote the nucleation of precipitates during artificial aging process. The mechanisms underlying the effect of quenching residual stress on the precipitation of 7085 Al alloy were also discussed.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Civil
Yasmin Lemcherreq, Severin Haefliger, Walter Kaufmann
Summary: Distinct jumps in strain occur in bare reinforcing bars when the yield limit is reached, while no such jumps are observed in reinforcing bars embedded in concrete. The different behavior is attributed to the three-dimensional stress state induced by bond forces at the bar ribs. This finding has implications for experiments investigating bond with distributed fibre optical strain sensing (DFOS) and the determination of steel and bond shear stresses in reinforcing bars embedded in concrete.
ENGINEERING STRUCTURES
(2023)
Article
Materials Science, Coatings & Films
Corbin M. Grohol, Yung C. Shin, Alex Frank
Summary: This study presents a method for depositing quench-sensitive age-hardening aluminum alloy clads without the need for solution heat treatment. The method involves using a high-powered diode laser and off-axis powder injection for melting the material. Quenching with liquid nitrogen immediately after the cladding process improves cooling rate and increases hardness response. The method was successfully demonstrated on aluminum alloy 6061 powder. In-situ liquid nitrogen quenching improved the clad hardness, and transmission electron microscopy revealed increased precipitate density as the reason for the hardness increase.
SURFACE & COATINGS TECHNOLOGY
(2022)
Review
Engineering, Biomedical
He Huang, Guannan Li, Qinggong Jia, Dong Bian, Shaokang Guan, Olga Kulyasova, R. Z. Valiev, Julietta V. Rau, Yufeng Zheng
Summary: This review comprehensively summarizes the recent advances in the mechanical properties of zinc-based biodegradable metals (BMs), with a focus on the strain softening phenomenon. The importance of specifying uniform elongation as a mechanical requirement for zinc-based BMs is highlighted, and the effects of alloying elements and microstructural characteristics on mechanical properties, especially uniform elongation, are summarized. Possible ways to minimize or eliminate the strain softening effect are also discussed.
ACTA BIOMATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Sven Riegsinger, Radian Popescu, Dagmar Gerthsen, Claus Feldmann
Summary: Aluminium nanoparticles with high crystallinity and small size (5.6 +/- 1.5 nm) were successfully synthesized via liquid-phase synthesis. These nanoparticles exhibit colloidal and chemical stability due to TMEDA functionalization, but show high reactivity after TMEDA removal.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Elisa Cantergiani, Irmgard Weissensteiner, Jakob Grasserbauer, Georg Falkinger, Stefan Pogatscher, Franz Roters
Summary: This study investigates the effect of an intermediate heat treatment on the formation of Cube texture in AA 6016 during final solution annealing. The initial grain size of the hot band does not affect the remaining Cube texture fraction after cold rolling, but it does affect the shape and distribution of the Cube grains and the kernel average misorientation in the cold-rolled specimens. The heat treatment reduces the intensity of the beta fiber components and promotes the formation of a low kernel average misorientation microstructure in the cold-rolled specimens.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Multidisciplinary Sciences
Nikolaus Papenberg, Thomas Hatzenbichler, Florian Grabner, Peter J. Uggowitzer, Stefan Pogatscher
Summary: Weight reduction is significant in transportation industries as it affects fuel consumption and vehicle range. Different materials are commonly used to take advantage of specific properties, with aluminum alloys used in both cast and wrought states. However, magnesium alloys, which are lighter, are only used in castings. Despite progress in scientific research on magnesium wrought alloys, their industrial implementation is limited, resulting in a lack of safety and structural applications. To promote industrial application and acceptance of these materials, the forging process of an automotive control arm was investigated. By using an age-hardenable Mg-Al-Ca-Zn-Mn lean alloy, which can be processed similarly to AL alloys, the study provides information on forming characteristics and challenges.
SN APPLIED SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Matheus A. Tunes, Stefan Fritze, Barbara Osinger, Patrick Willenshofer, Andrew M. Alvarado, Enrique Martinez, Ashok S. Menon, Petter Strom, Graeme Greaves, Erik Lewin, Ulf Jansson, Stefan Pogatscher, Tarik A. Saleh, Vladimir M. Vishnyakov, Osman El-Atwani
Summary: High-entropy materials have emerged as the cutting-edge strategy for alloy design in extreme environments. Recent research indicates that high-entropy alloys (HEAs) demonstrate excellent radiation resistance compared to conventional alloys due to the suppression of damage formation and evolution. This paper presents the extension of the high-entropy concept to novel high-entropy ceramics (HECs) for applications in environments with energetic particle irradiation. The synthesized HEC in the CrNbTaTiW quinary refractory system exhibits nanocrystalline grains, single-phase crystal structure, and approximately 50 at.% carbon content. In-situ transmission electron microscopy was used to evaluate the irradiation response of HEC and compare it with HEA. Both materials showed no displacement damage effects up to a dose of 10 displacements-per-atom, and surprisingly, HEC did not amorphize under the investigated conditions. Implantation of Xe in both materials resulted in the nucleation of bubbles, but smaller sizes compared to conventional nuclear materials, indicating their potential as candidates for nuclear energy applications.
Article
Materials Science, Multidisciplinary
O. M. Prada Ramirez, T. M. Kremmer, J. H. Marin, B. P. da Silva, M. Starykevich, M. A. Tunes, M. G. S. Ferreira, I. V. Aoki, R. A. Ando, S. Pogatscher, H. G. de Melo
Summary: The corrosion resistance of the AA2024-T3 alloy can be significantly improved by using top protective sol-gel hybrid organic-inorganic coatings. Samples with Ce nanoparticles incorporated in the anodic layer pores displayed better performance compared to samples with only the coating. This research reveals the self-healing capability against corrosion of the sol-gel coating in the presence of Ce nanoparticles, as well as the good coverage of defective regions within the oxide by the hybrid layer. It opens up a new paradigm in maximizing the corrosion resistance for non-ferrous anodized alloys.
Article
Nanoscience & Nanotechnology
Milad Roostaei, Peter J. Uggowitzer, Reinhard Pippan, Oliver Renk
Summary: The attractive properties of Mg-bcc nanocomposites have gained increasing interest, but bulk fabrication has been unsuccessful due to strain localization within the Mg-phase. Through high-pressure torsion, the deformation behavior and resulting microstructures of Mg-Fe composites were analyzed at different applied strains and processing temperatures. Surprisingly, processing at 73% of Mg's melting point accelerated microstructural refinement and improved homogeneity, leading to a three-fold increase in hardness compared to ambient processing. This suggests that further optimization could potentially create Mg-based materials with strength beyond a gigapascal.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Sebastian Samberger, Irmgard Weissensteiner, Lukas Stemper, Christina Kainz, Peter J. Uggowitzer, Stefan Pogatscher
Summary: This study presents age-hardenable, fine-grained AlMgZnCu crossover alloys intended for superplastic and quick plastic forming processes. These alloys utilize T-phase (Mg32(Al,Zn)49) to refine the grain structure and increase age-hardening. The study demonstrates the importance of particle stimulated nucleation (PSN) using T-phase particles, which leads to a fine grain size as low as 4 μm. The resulting alloys have excellent high-temperature forming properties and high stability.
Article
Materials Science, Multidisciplinary
Bernhard Trink, Irmgard Weissensteiner, Peter J. Uggowitzer, Katharina Strobel, Anna Hofer-Roblyek, Stefan Pogatscher
Summary: This study introduces new alloys that combine the age-hardening capability of Al-Mg-Si alloys with the microstructure-controlling effect on processing of primary Fe-rich intermetallic phases used in foil stock. Processing and microstructure-property relations in new crossover aluminum alloys derived from 6xxx and 8xxx foil stock alloys are shown. The study demonstrates the attractive combinations of strength and ductility achieved in these new alloys.
Article
Engineering, Mechanical
D. Schimbaeck, L. Kaserer, P. Mair, F. Palm, G. Leichtfried, S. Pogatscher, A. Hohenwarter
Summary: This paper aims to unveil the impact of unique bimodal microstructure on the quasi-static tensile and fatigue properties of Scalmalloy (R). The study reveals that Scalmalloy (R) has a higher fatigue strength compared to its additively manufactured aluminum counterparts, reaching levels comparable to additively manufactured Ti-6Al-4V.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Biochemical Research Methods
Diego S. R. Coradini, Matheus A. Tunes, Patrick Willenshofer, Sebastian Samberger, Thomas Kremmer, Phillip Dumitraschkewitz, Peter J. Uggowitzer, Stefan Pogatscher
Summary: The present study demonstrates a methodology for in situ investigation of nanoalloying using metallic nanomaterials as reactants within a transmission electron microscope. The method can be used as a starting point for studying nanometallurgy and subsequent alloying of materials. The results showed that both Au and Cu nanomaterials could alloy with Al when melted in the transmission electron microscope. Overall, these results suggest that transmission electron microscope-based in situ melting and alloying is a valuable technique for studying the metallurgical processing of nanomaterials.
Article
Materials Science, Multidisciplinary
Philip Aster, Phillip Dumitraschkewitz, Peter J. Uggowitzer, Florian Schmid, Georg Falkinger, Katharina Strobel, Peter Kutlesa, Michael Tkadletz, Stefan Pogatscher
Summary: This study investigated the formation of solute clusters and their contribution to strain hardening in aluminum alloys by using APT and tensile testing. The results showed that clusters could form during plastic deformation, which was referred to as strain-induced clustering.
Article
Materials Science, Multidisciplinary
P. D. Willenshofer, M. A. Tunes, C. Kainz, O. Renk, T. M. Kremmer, S. Gneiger, P. J. Uggowitzer, S. Pogatscher
Summary: This study investigates the precipitation behavior of the T-phase in crossover aluminium alloys, revealing that the ultrafine-grained alloy exhibits different and accelerated precipitation behavior compared to the coarse-grained alloy. Moreover, the ultrafine-grained alloy shows high resistance to grain growth during heating, primarily attributed to the synergistic effect of inter-granular and trans-granular precipitation of T-phase.
MATERIALS RESEARCH LETTERS
(2023)