Article
Materials Science, Multidisciplinary
Yuanxiao Dai, MengHan Xiao, Yaobo Hu, Yan Yang, Bin Jiang, Tianxu Zheng, Li Dong, Baoqing Yang, Changyong Zheng
Summary: By designing extrusion parameters, the Mg-0.12Ca-0.08Ba alloy underwent grain refinement and texture control, resulting in the best performance of the extruded samples with different crystallographic orientations.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Jiejun He, Lushu Wu
Summary: An obvious strengthening phenomenon has been observed in the Mg-6Al-1Zn (AZ61) alloy after simultaneous loading and aging at 170 degrees C. This simultaneous loading and aging process can increase the yield stress of the alloy by promoting the formation of a larger quantity of Al12Mg17 precipitates. The loading during aging is speculated to be more beneficial for nucleation of the precipitates, leading to a higher yield stress compared to aging after pre-strain.
Article
Metallurgy & Metallurgical Engineering
Jing Tang, Wentao Jiang, Qingyuan Wang, Xiaobao Tian, Dean Wei, Haidong Fan
Summary: The interaction between a plate-like precipitate and twin boundaries in magnesium alloys was studied using molecular dynamics simulations. It was found that the precipitate was not sheared by one twin boundary but was sheared by another twin boundary. The predominant deformation mode in the sheared precipitate was shearing on the (110) plane. The blocking effects of precipitates with different sizes on twinning were also investigated, and it was observed that the blocking effect increased with increasing precipitate length and thickness, but weakly changed with precipitate width. Based on the revealed interaction mechanisms, a critical twin shear was calculated using the Eshelby solutions, and an analytical hardening model of sheared precipitates was proposed.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Mingzhe Bian, Xinsheng Huang, Yasumasa Chino
Summary: In the solution treated state, Ag and Ca atoms segregate to grain boundaries, promoting the early formation of GB precipitates compared to the grain interior. Prolonged aging results in the growth of GB precipitates, which serve as preferred initiation sites for microcracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Young-Gil Jung, Wonseok Yang, Yong Joo Kim, Shae K. Kim, Young-Ok Yoon, Hyunkyu Lim, Do Hyang Kim
Summary: The addition of Ca improved the ignition resistance and refined the grains of the ZWK611 alloy, leading to enhanced mechanical properties at both room temperature and 150 degrees C. The presence of Tau- and W-phases, as well as the more uniform distribution of MgZn' precipitates in the Ca-added alloys, contributed to the improved performance of the T6-treated alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Metallurgy & Metallurgical Engineering
Weixin Lou, Hongbo Xie, Xiaobo Zhao, Junyuan Bai, Hehang Zhang, Yi Wang, Xinze Li, Hucheng Pan, Yuping Ren, Gaowu Qin
Summary: In Mg alloys, precipitation on non-basal planes is limited but crucial. However, in an aged ultralight Mg-Li-Zn alloy, precipitates dominated by C15 Laves structure can form in various habit planes, resulting in three forms of strengthening-phases: precipitate-rod, precipitate-lath, and precipitate-plate. Moreover, the non-basal precipitates can transform into the basal (Mg, Li)Zn2 Laves structure with prolonged aging. These findings provide insights into the precipitation behaviors of multi-domain Laves structures and offer guidance for designing ultralight high-strength Mg-Li based alloys.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Hong Ju, Cheng Wang, Zhao-Yuan Meng, Jiang You, Kai Guan, Min Zha, Hui-Yuan Wang
Summary: Solute segregation at the phase boundary (PB) is critical for stabilizing nano-precipitates in Mg alloys. The impact of solute elements (Ag, Sn, Bi, and In) on interfacial properties of α-Mg/Al2Ca was investigated using first-principles calculations. Both chemical and mechanical contributions of solute segregation were found to affect PB stability, with the former playing a dominant role. Ag segregation was shown to improve the thermal stability of the Al2Ca phase. This work provides a new perspective for developing Mg alloys with tailored interfacial properties for high-temperature applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Zhao Yang, Chao Xu, Taiki Nakata, Shigeharu Kamado
Summary: This study investigated the effect of extrusion parameters on the microstructural evolution and tensile properties of a Mg-8.0Gd-4.0Y-1.0Mn-0.4Sc alloy. Different DRX mechanisms, such as DDRX and CDRX, were identified, and the alloy with larger extrusion ratio exhibited smaller DRXed grains and a high number of fine precipitated particles. The alloy extruded at 400°C and ratio of 20:1 showed superior strength, while alloy extruded at 450°C and ratio of 10:1 exhibited higher elongation to failure. The enhanced strength was attributed to strong basal texture, refined DRXed grains, and dense distribution of fine particles.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Vanja Asanovic, Dragan Radonjic, Jelena Scepanovic, Darko Vuksanovic
Summary: The correlation between thermomechanical parameters and chemical composition in Cu-Zn-Al alloys was studied, showing that alloys with lower aluminum content exhibited better properties, recoverable strain, and shape memory recovery during tensile testing.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Metallurgy & Metallurgical Engineering
Hui Shi, Yuanding Huang, Lixiang Yang, Chunquan Liu, Hajo Dieringa, Chong Lu, Lv Xiao, Regine Willumeit-Roemer, Norbert Hort
Summary: This study investigates the creep behavior and microstructural evolution of sand-cast Mg-14Gd-0.4Zr alloy using compressive creep tests. The results show that the coherent distribution of beta' and beta' (F) phases effectively impedes dislocation movement and enhances creep resistance. However, with increasing creep time, the fine precipitate chains coarsen and transform into different phases, leading to stress concentration and increased creep strain.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Qian Su, Rongrong Wang, Huan Yu, Hang Li, Jixue Zhou, Dejin Wang, Lianxi Hu
Summary: Nanocrystalline (NC) magnesium alloys and composites have the potential to improve energy efficiency in transportation applications due to their outstanding strength. However, softening caused by grain growth at elevated temperatures can lead to fatal invalidation. This study investigated the thermal stability of NC SiCp/AZ91 composites, including phase transformation, grain growth, softening, and strengthening mechanisms. The results showed that the addition of submicron SiC particles and nano-scale Mg17Al12 precipitates provided excellent thermal stability and prevented significant softening of the composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Industrial
X. M. Chen, W. Z. Chen, L. X. Zhang, H. X. Wang, W. K. Wang, W. C. Zhang
Summary: Three combined extrusion techniques were used to fabricate three typical {0002} basal textures in fine-grained ZK61 magnesium alloy, and their influence on tension-compression asymmetry was evaluated. The study showed that basal texture dispersion decreased tension-compression asymmetry and achieved high-strength symmetrical ZK61 magnesium alloy successfully.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Rasim Eris, M. Vedat Akdeniz, Amdulla O. Mekhrabov
Summary: The atomic size of alloying elements is the primary factor affecting the strengthening of Ni-based superalloys. This study investigates the influence of Hf element addition and its co-additions with Mo(W) elements on the microstructural and mechanical properties of model Ni80Al15Hf5 and Ni80Al15Hf2.5Mo(W)2.5 superalloys. It is concluded that replacing a portion of Hf addition with Mo(W) can reduce the participation tendency of Hf and Mo(W) elements, and the co-addition of Hf and W leads to better mechanical strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Wenzhen Chen, Wenjie Wu, Wenke Wang, Wencong Zhang, Xinhua Liu, Hyoung Seop Kim
Summary: Texture adjusting approaches were proposed to improve tension-compression asymmetry in magnesium alloys. The dominant deformation mechanism during yielding was quantified based on Sachs assumption and primarily manifested as twinning inhibition and transition between twinning and slip. The impacts on yield strength and asymmetry were estimated by modified Hall-Petch relationship. Slight texture adjustments, particularly of basal texture divergence, can significantly improve strength asymmetry while avoiding severe strength loss, illustrating the importance and potential of texture adjustment in engineering.
MATERIALS RESEARCH LETTERS
(2023)
Article
Metallurgy & Metallurgical Engineering
E. P. Silva, R. H. Buzolin, F. Marques, F. Soldera, U. Alfaro, H. C. Pinto
Summary: Mg-Zn-Zr (ZK) alloys have high mechanical strength, but are susceptible to hot cracking due to the formation of low melting point precipitates. Adding rare earths can improve the alloy's performance. Ce-base mischmetal addition can enhance hot rolling behavior, refine grain size, and improve mechanical properties of ZK60 alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Metallurgy & Metallurgical Engineering
Jun Cheng, Tingting Guo, Matthew R. Barnett
Summary: This paper examines the temperature sensitivity of tensile twinning in a magnesium single crystal during nanoindentation. It is found that the generation of twinning is temperature-dependent, with a decrease in pop-in load as temperature increases. The activation energy obtained from thermal activation analysis is consistent with the observations.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Nanoscience & Nanotechnology
J. Joseph, M. Annasamy, S. R. Kada, P. D. Hodgson, M. R. Barnett, D. M. Fabijanic
Summary: This study analyzed the effect of the relative contents of Al and Ti on the equilibrium phase formation in a novel high entropy superalloy system. Lower Al/Ti ratio improved the mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Hossein Beladi, Ehsan Farabi, Peter D. Hodgson, Matthew R. Barnett, Gregory S. Rohrer, Daniel Fabijanic
Summary: Solid-state additive friction stir deposition was used for three-dimensional printing of 316L stainless steel. The resulting microstructure was exceptionally fine, with a significantly different misorientation angle distribution from the original material, and a texture showing strong shear components.
PHILOSOPHICAL MAGAZINE
(2022)
Article
Nanoscience & Nanotechnology
Jun Wang, Mahmoud Reza Ghandehari Ferdowsi, Peter A. Lynch, Sitarama R. Kada, Matthew R. Barnett
Summary: This study investigates the effects of age hardening on different types of twinning in magnesium alloys, specifically in alloy Mg-6.5Zn with bimodal textures. It was found that tensile twinning is stimulated by precipitates while compression twinning is suppressed by them. This difference is attributed to lower twin surface energy and a larger twinning dislocation Burgers vector in compression twins.
SCRIPTA MATERIALIA
(2022)
Article
Mechanics
Alban de Vaucorbeil, Vinh Phu Nguyen, Christopher R. Hutchinson, Matthew R. Barnett
Summary: This paper presents a study on the Total Lagrangian Material Point Method (TLMPM) for simulating scratch tests, showing its stability and accuracy through comparisons with experimental results and existing research.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Jun Wang, Mahmoud Reza Ghandehari Ferdowsi, Sitarama Raju Kada, Steven Babaniaris, Bevis Hutchinson, Peter A. Lynch, Matthew R. Barnett
Summary: The C-texture appears in Mg-6.5Zn alloy with heavy alloying and higher extrusion ratios. It is not solely linked to the presence of second phase particles, and the starting texture is not essential for its formation. The promoted pyramidal < c + a > slip mechanism is likely responsible for its formation.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Multidisciplinary
J. D. Robson
Summary: This study implemented a simple finite element Mott model to investigate the fragmentation effect of a thin walled ring, and explored the influence of local variations in fracture strain around the ring. The results showed that the characteristic Mott distribution of fragment size can be reproduced successfully, regardless of the random distribution of fracture strains or the choice of function used to describe the fracture strain scatter, as long as a sufficient number of simulations are run.
DEFENCE TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Ashok Meghwal, Samuel Pinches, Hannah J. King, Christiane Schulz, Nikki Stanford, Colin Hall, Christopher C. Berndt, Andrew Siao Ming Ang
Summary: Fe-based amorphous coatings manufactured by the HVOF process were studied for their applications in high-temperature wear, marine, and acidic corrosion environments. The coatings exhibited improved mechanical properties and wear resistance at high temperatures, as well as higher corrosion resistance in seawater and acidic solutions.
Article
Materials Science, Multidisciplinary
Berzah Yavuzyegit, Egemen Avcu, Albert D. Smith, Jack M. Donoghue, David Lunt, Joseph D. Robson, Timothy L. Burnett, Joao Quinta da Fonseca, Philip J. Withers
Summary: By coupling an improved speckle patterning method enabling high resolution digital image correlation (HRDIC) at nanoscale strain resolution with a scanning electron microscope allowing autonomous experimental control and image acquisition during in situ tensile straining, the plastic deformation in AZ31 Mg alloy at the grain scale to significant plastic strains has been mapped for the first time. The proposed methodologies have the potential to characterise the real-time deformation behaviour of a wide range of engineering alloys at the grain scale at room and elevated temperatures.
Article
Geochemistry & Geophysics
Reza Mahjoub, Marta Krasowska, Nikki Stanford, William Skinner, Philip Forson
Summary: Arsenian pyrite is strongly associated with gold, and understanding the chemical speciation of arsenic in arsenian pyrite is crucial for determining its reactivity and mobility. Through spectroscopic analysis and theoretical calculations, it was found that arsenian pyrite exhibits a shift in binding energy compared to its bulk counterpart, indicating the presence of As clusters and localized lattice strain. These findings provide important insights for future studies on the reactive sites in arsenian pyrite compared to arsenopyrite and pyrite.
AMERICAN MINERALOGIST
(2023)
Article
Nanoscience & Nanotechnology
J. D. Robson, M. J. Lawson, J. M. Donoghue, J. Guo, A. E. Davis
Summary: Discontinuous precipitation (DP) is a common mechanism for solid solution decomposition, resulting in the formation of precipitate layers and solute depleted matrix along a moving boundary. The morphology of DP regions is highly complex, and the behavior of dislocations and twins within such structures during deformation is not well understood. A 3-dimensional (3D) analysis is necessary to reveal the true morphology of DP. This study presents the first 3D investigation of DP using a novel PFIB based serial sectioning method. The AZ80 alloy studied exhibits an interconnected network of DP regions within a connected matrix, with varying widths of DP regions.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Yi Yang, Veronique Massardier, Mahmoud Reza Ghandehari Ferdowsi, Lu Jiang, Jun Wang, Thomas Dorin, Sitarama R. Kada, Matthew R. Barnett, Michel Perez
Summary: This study provides new insights into the precipitation kinetics in Mg-Zn alloys. Through the characterization of the evolution of Zn solute, precipitate size, and volume fraction using various techniques, the experimental results are supported by a precipitation model based on classical nucleation and growth theories. The study reveals the prevalence of rod-shaped precipitates in the early aging stage and plate-shaped precipitates in the overaging stage.
Article
Materials Science, Multidisciplinary
Charline Le Nue, Santiago Corujeira Gallo, Alireza Vahid, Jiangting Wang, Mehdi Taherishargh, Hooyar Attar, Daniel Fabijanic, Matthew Barnett
Summary: High-chromium cast irons are commonly used for wear-resistant applications, and there is ongoing debate on the secondary carbide types during heat treatment. This study examines the microstructural evolution of a hypoeutectic high-chromium cast iron and finds that M23C6 secondary carbides precipitate during heating, while higher temperatures result in the formation of both M23C6 and M7C3 secondary carbides. The carbon content of the matrix plays a significant role in determining the martensite start temperature and bulk hardness.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Engineering, Manufacturing
Ehsan Farabi, Steven Babaniaris, Matthew R. Barnett, Daniel M. Fabijanic
Summary: The additive friction stir deposition (AFSD) of Ti6Al4V alloy was performed successfully with improved ductility and strength of the deposited state, achieved by the reduction of deposition temperature and refinement of the as-deposited phase structure.
ADDITIVE MANUFACTURING LETTERS
(2022)
Meeting Abstract
Pediatrics
Chantal Angueyra, Adriana Montes Gil, Nicole Stanford, Julie S. Glickstein, Kathleen Brennan