Article
Nanoscience & Nanotechnology
Y. Zhao, R. Jiang, A. Harte, D. J. Bull, P. A. S. Reed
Summary: This study characterizes the strain localization under cyclic loading in an advanced powder metallurgy Ni-based superalloy at 450°C. The results show that strain mainly accumulates in slip/strain bands, and the strain saturates at 1000 cycles. The strain bands mainly consist of shear strain along the strain band and transverse strain normal to the strain band.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Alice Cervellon, Chris J. Torbet, Tresa M. Pollock
Summary: The anisotropic fatigue properties of three Ni-based SX superalloys were investigated in the very high cycle fatigue regime. The [111] orientation showed higher fatigue lives at high stresses but lower fatigue lives at very low stresses. The resolved shear stress on the octahedral slip systems and the pseudo-cube slip in the matrix were identified as the main reasons for the anisotropy effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Lucille Despres, Sophie Costil, Jonathan Cormier, Patrick Villechaise, Romain Cariou
Summary: Surface laser texturing is used to enhance mechanical anchoring and adhesion between interfaces of thermal barrier coating systems. This study analyzed microstructural evolutions in different Ni-based single crystal superalloys during infrared nanosecond laser ablation, and compared thermal-affected volumes for different alloys. The research found that all studied single crystal superalloys behaved similarly during nanosecond laser ablation, suggesting possible non-uniform ablation kinetics between different phases of Ni-based alloys.
Article
Materials Science, Multidisciplinary
Yue Su, Shao-Shi Rui, Qi-Nan Han, Zhi-Hao Shang, Li-Sha Niu, Hao Li, Hiroshi Ishikawa, Hui-Ji Shi
Summary: This study developed an experimental method using digital image correlation (DIC) to quantify relative slip and evaluate the sliding portion. The results showed a close correlation between fretting scars and relative slip, as well as a transition from gross slip to partial slip. The variation of relative slip was consistent with the tangential force coefficient, and the load amplitude was found to be an important factor for fretting fatigue damage.
Article
Engineering, Mechanical
Wen-Ping Wu, Zi-Jun Ding, Yun-Li Li, Chao Yu, Guozheng Kang
Summary: The thermomechanical fatigue (TMF) properties of Ni-based single crystal superalloys are studied using molecular dynamics simulations. Two different cyclic deformation mechanisms are identified. Under Out-of-phase TMF loading, the samples exhibit a higher cyclic stress range, plastic strain energy density, and shorter fatigue life compared to In-phase TMF loading. The low-temperature tension half-cycle is found to result in earlier failure due to dislocation and stacking fault penetration into the precipitate phase, attracting more attention in actual operation.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Ryota Okamoto, Shiyu Suzuki, Motoki Sakaguchi, Hirotsugu Inoue
Summary: This study measured the variation over time of creep strain fields around a fatigue crack tip in a single crystal Ni-based superalloy at temperatures up to 900 degrees C using digital image correlation. A high-temperature DIC measurement system was developed to overcome difficulties caused by pattern degradation, thermal radiation, and heat haze. Results showed that strain and strain rate increased with higher temperatures and hold loads.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Nanoscience & Nanotechnology
Marat Latypov, Jean-Charles Stinville, Jason R. Mayeur, Jonathan M. Hestroffer, Tresa M. Pollock, Irene J. Beyerlein
Summary: The study reveals that highly localized elastic strain concentrations in polycrystalline microstructures under monotonic loading depend on particular crystallographic and morphological orientations of grains, rather than on crystalline details of their local neighborhood. Annealing twin boundaries with specific topological and crystallographic features may increase the likelihood of slip band initiation throughout the microstructure of polycrystalline Ni-base superalloys.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
K. J. Tan, X. G. Wang, J. J. Liang, J. Meng, Y. Z. Zhou, X. F. Sun
Summary: The study focused on the microstructures of a second-generation Ni-based single crystal superalloy after creep and rejuvenation heat treatment. It was found that the rejuvenation heat treatment had a shallow impact on the microstructures, such as the dislocation network, the gamma phase, and the gamma' phase, without significantly affecting the alloy properties. Additionally, the average creep life after rejuvenation heat treatment was comparable to that after standard heat treatment, indicating that RHT could effectively repair damaged parts and prolong the overall life of the sample.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jonathan M. Hestroffer, Marat Latypov, Jean-Charles Stinville, Marie-Agathe Charpagne, Valery Valle, Matthew P. Miller, Tresa M. Pollock, Irene J. Beyerlein
Summary: This study investigates the evolution of intragranular lattice rotations and slip activity in a high performance, polycrystalline face centered cubic material during monotonic and cyclic loading using a combination of in-situ high-resolution digital image correlation (HR-DIC), Heaviside-DIC method (H-DIC), and crystal plasticity finite element (CPFE). The results show that most grains develop intragranular lattice rotation gradients that span the grain, regardless of their size and lattice orientation. The analysis of slip lines reveals agreement in the active slip systems and changes in local slip activity across individual grains. The findings suggest that deforming grains are divided into sub-granular regions of uniform lattice rotation, most often associated with one or two active slip systems.
Article
Materials Science, Multidisciplinary
Qinghai Pan, Xinbao Zhao, Quanzhao Yue, Wanshun Xia, Xiao Wei, Yuefeng Gu, Ze Zhang
Summary: The effects of Co on multi-scale elemental distributions were investigated in advanced Ru-containing Ni-based single crystal superalloys. The study compared the microstructural heterogeneities on two scales, large-scale dendritic segregations and small-scale elemental partitions between gamma/gamma' phases, in different alloy conditions. The results showed that the addition of Co enhanced both large and small-scale elemental homogeneities and limited the precipitation of a specific phase. This suggests the potential of Co to replace part of Ru in advanced superalloys.
Review
Materials Science, Multidisciplinary
Noah Holtham, Keivan Davami
Summary: This review paper discusses the surface-initiated damage mechanisms in single crystal Ni-based superalloys and the progress of post-processing techniques, with a particular focus on laser peening (LP). LP is of significant interest due to its low cold work, greater depth of compressive residual stresses, ability to accommodate complex part geometries, and minimal effect on surface roughness. LP treatment can greatly hinder crack growth and enhance fatigue life, making it a worthy choice for increasing the service lives of turbine blades.
Article
Engineering, Mechanical
Dharmesh Kumar, Sridhar Idapalapati, Wei Wang
Summary: This study investigated the influence of residual compressive stress (RCS) depth and magnitude generated through different surface treatments on fatigue crack mechanisms of Ni-based superalloy. The results showed a pronounced improvement in fatigue life at a depth of 400 μm induced RCS, but a reduction in fatigue life when RCS depth increased to 800-1000 μm. Failure mechanisms were primarily driven by micro-cracks formed due to balancing tensile stresses and high intensity stress concentration.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Mechanical
J. Telesman, T. P. Gabb, P. T. Kantzos, L. J. Ghosn
Summary: The study examined the influence of various broaching machining parameters on the high temperature fatigue lives of a nickel-based disk alloy, quantifying the effects of tool wear and broaching speed on residual stresses, cold work, and surface roughness. These variables were found to have a substantial impact on fatigue lives, failure mode types, and fatigue crack initiation mechanisms. Statistical analyses were used to evaluate these relationships.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Mechanics
Minghua Wang, Mengyue He, Zhihong Liang, Di Wu, Yue Wang, Xinlin Qing, Yishou Wang
Summary: This paper investigates the fatigue behavior of CFRP open-hole laminated beams with different stacking sequences under pure tensile loading using acoustic emission (AE) and digital image correlation (DIC), and analyzes the influence of different damage mechanisms on the ultimate fatigue failure. The stiffness degradation behavior of CFRP structures is characterized by AE hit rate and absolute AE energy, and the strain field distribution characteristics during the damage failure are discussed in association with DIC. By combining PCA and the Kmeans++ algorithm, the damage modes of two types of layered CFRP laminated beams are identified and their contribution to the ultimate fatigue failure is analyzed using CDI values.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Jongkee Ahn, Chiwon Kim, Dongyeop Lee, Bohee Kim, Hyun-Uk Hong, Je-Hyun Lee
Summary: This study compared the microstructure and mechanical properties of Incoloy 901 repair welds produced via direct-energy-deposition (DED) and conventional tungsten-inert-gas (TIG) welding. The DED repair welds exhibited finer dendritic grains, lower microsegregation, and a narrower heat-affected zone (HAZ) compared to the TIG repair welds. The DED repair welds demonstrated superior tensile and high-cycle-fatigue properties compared to the TIG repair welds.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Alberto W. Mello, Andrea Nicolas, Ricardo A. Lebensohn, Michael D. Sangid
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2016)
Article
Materials Science, Multidisciplinary
A. W. Mello, T. A. Book, A. Nicolas, S. E. Otto, C. J. Gilpin, M. D. Sangid
EXPERIMENTAL MECHANICS
(2017)
Article
Materials Science, Multidisciplinary
Andrea Nicolas, Alberto W. Mello, Michael D. Sangid
Article
Materials Science, Multidisciplinary
Andrea Nicolas, Alberto W. Mello, Michael D. Sangid
Article
Engineering, Aerospace
Fabio A. de Almeida, Eduardo Bento Guerra, Flavio Araripe d'Oliveira, Alberto Walter Mello
JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
(2012)
Article
Nanoscience & Nanotechnology
Andrea Nicolas, Alberto W. Mello, Yiwei Sun, David R. Johnson, Michael D. Sangid
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Materials Science, Multidisciplinary
Andrea Nicolas, Alberto W. Mello, Michael D. Sangid
Article
Materials Science, Multidisciplinary
Ritwik Bandyopadhyay, Alberto W. Mello, Kartik Kapoor, Michael P. Reinhold, Thomas F. Broderick, Michael D. Sangid
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2019)
Article
Materials Science, Multidisciplinary
John Rotella, Alberto W. Mello, Ajey Venkataraman, Ross Buckingham, Mark Hardy, Michael D. Sangid
Summary: The study investigated the impact of grain boundary morphology on cavitation behavior in a Ni-based superalloy, RR1000, during elevated temperature dwell-fatigue. Results indicated that serrated GB morphologies increased the proclivity for cavity formation, with strain localization occurring near the GBs before cavity formation.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Engineering, Aerospace
Ken Shishino, Christopher T. Leirer, Alberto W. Mello
Summary: This research investigates the effect of hole cold expansion on fatigue life of precracked material under aggressive environments. The results show that the cold expansion treatment significantly improves the fatigue life. However, corrosion may cause the critical crack to grow outside of the region where the benefits of cold expansion can be achieved, necessitating reevaluation of the inspection area.
Proceedings Paper
Engineering, Aerospace
Flavio de Azevedo Correa Junior, Alberto Walter da Silva Mello Junior
PROCEEDINGS OF THE 21ST ESA SYMPOSIUM ON EUROPEAN ROCKET & BALLOON PROGRAMMES AND RESEARCH
(2013)
Article
Engineering, Aerospace
Alberto W. S. Mello, Daniel Ferreira V. Mattos
JOURNAL OF AEROSPACE TECHNOLOGY AND MANAGEMENT
(2009)
Article
Engineering, Aerospace
Alberto W. S. Mello Junior, Abilio Neves Garcia, Fabricio N. Ribeiro, Daniel Ferreira V. Mattos
JOURNAL OF AEROSPACE TECHNOLOGY AND MANAGEMENT
(2009)
Article
Engineering, Aerospace
Daniel Ferreira V. Mattos, Alberto W. S. Mello Junior, Fabricio N. Ribeiro
JOURNAL OF AEROSPACE TECHNOLOGY AND MANAGEMENT
(2009)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)