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Article
Materials Science, Multidisciplinary
Yue Ren et al.
Summary: This study demonstrates an improvement in wear resistance for a Ti-based bulk metallic glass composite at cryogenic temperatures. The wear resistance improvement is associated with the suppressed martensitic transformation and increased strength, making the material an excellent candidate for cryogenic wear applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Lei Zhang et al.
Summary: The structural evolution near the crystalline/matrix interface in CuZr-based metallic glass composite (MGC) was investigated using in situ transmission electron microscope (TEM) tensile straining and molecular dynamics (MD) simulation. Plastic deformation of the crystalline phase occurred before the amorphous phase, involving recoverable martensite transformation, dislocation accumulation at the interface, and local amorphization between grains. Fracture did not occur along the interphase interface, but within the crystalline phase near the interface, indicating a strong interface and high work hardening rate of the crystalline phase. MD simulations revealed that the amorphous phase was marginally metastable compared to the stable B2 phase, while the B19' martensitic phase was metastable with higher energy, explaining the easy mutual transformation between B2 and amorphous phase, and the less frequent transformation product of B19' phase from B2 during straining.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Cunliang Pan et al.
Summary: A CoCrNi composite material with 3 wt% TiC was successfully fabricated by laser powder bed fusion (LPBF). The segregation of C and the formation of nanoprecipitates along the grain boundaries improved the grain coalescence and restricted the grain growth. The addition of 3 wt% TiC resulted in a composite microstructure without hot cracks, consisting of small grains and exhibiting a more random texture. The synergistic strengthening effects of different types of dislocations and nano-precipitates endowed the alloy with excellent mechanical properties, including high tensile strengths and elongations at both ambient and elevated temperatures.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Lu Yang et al.
Summary: In this study, the friction and wear behaviors of CoCrNi2(Al0.2Nb0.2) alloy with high-density coherent L1(2) nanoprecipitates during sliding at room and elevated temperatures were systematically investigated. The results showed that the alloy exhibited low wear rate and excellent wear resistance at room temperature, attributed to the precipitation strengthening and dynamic workhardening. At elevated temperature, the reduced wear rates and coefficients of friction were associated with the formation of glaze layer and high resistance to thermal softening. This work provides significant insight into the sliding-induced microstructure evolution and deformation mechanism of L1(2)-strengthened high-entropy alloys during sliding wear.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jiasi Luo et al.
Summary: Superior wear resistance can be achieved by in-situ formation of an amorphous-crystalline nanocomposite layer and gradient nanostructure during wear at elevated temperatures.
Article
Engineering, Multidisciplinary
Yanbin Shi et al.
Summary: Structural superlubricity, achieved by transforming macro-contact surfaces into micro- or nano-contact points, has significant implications for energy consumption control and carbon neutralization. In this study, a robust multi-contact interface was spontaneously constructed during friction using a well-tuned MoS2/amorphous metal superlattice coating, resulting in macroscale superlubricity with low environmental sensitivity. The coating consisted of nanoparticles with uniform size and distribution wrapped by randomly oriented MoS2 patches, achieving large-scale multi-contact at the sliding interface and demonstrating excellent stability.
COMPOSITES PART B-ENGINEERING
(2023)
Letter
Materials Science, Multidisciplinary
Hong-Ge Li et al.
Article
Materials Science, Multidisciplinary
Weiming Ji et al.
Summary: This study provides atomistic insights into the solid-state amorphization and deformation mechanisms of Cantor alloys at cryogenic temperatures. It is found that low stacking fault energy leads to the formation of multi-dislocation junctions, resulting in amorphization. Deformation mechanisms in the amorphous/crystalline dual phase regions include high-density partial dislocations and multi-dislocation junctions in the crystalline region, as well as radiation-shaped shear bands and amorphous bridges in the amorphous region, which are rarely observed in conventional alloys at low temperatures.
Article
Materials Science, Multidisciplinary
Qian Jia et al.
Summary: Both structure relaxation and oxidation of surface layer induced by thermal treatment or friction heat play significant roles in reducing wear of metallic glasses (MGs). The oxidized surface layer exhibits the best anti-wear performance, with significant reductions in both adhesive and ploughing friction, which is attributed to hindered interfacial bonding and enhanced wear resistance.
Article
Engineering, Multidisciplinary
Cun-hong Yin et al.
Summary: In this study, a novel nanocomposite self-lubricating oxide surface composed of amorphous structures and oxide nanoparticles was discovered. The formation process and mechanism were demonstrated, and the improved tribological and wear properties of the surface were observed.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Engineering, Mechanical
Qing Zhou et al.
Summary: The combination of metallic glass and graphene in a multilayer film improves its mechanical properties and wear resistance, making it suitable for miniature systems and tools.
Article
Multidisciplinary Sciences
Dong Liu et al.
Summary: This study found that CrCoNi alloy displays exceptional crack growth toughness at 20 Kelvin, with high crack-initiation fracture toughness values and crack growth toughness values. The crack-tip deformation structures at 20 K involve nucleation and restricted growth of stacking faults, fine nanotwins, and transformed epsilon martensite, with coherent interfaces.
Article
Engineering, Multidisciplinary
Qianqian Cheng et al.
Summary: Preparation of cermet-modified layers on titanium alloy surfaces using lasers is an effective method to enhance wear resistance. In this study, a Ti-TiN composite cermet layer was prepared on a titanium alloy surface through laser melting. The formed cermet layer exhibited improved wear resistance, especially at high temperatures, and the friction glaze layer formed in the wear scar further enhanced the wear resistance.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Qingfeng Wu et al.
Summary: This study proposes the concept of phase-selective recrystallization to improve the ductility and strength of eutectic alloys. By manipulating the strain partitioning behavior of the duplex phases, the resulting microstructure fully releases the strain hardening capacity and achieves high ductility. This concept is applicable to various duplex alloys and opens new frontiers for traditional eutectic alloys as high-strength metallic materials.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Yue Ren et al.
Summary: This study demonstrates the role of subsurface and surface structures in enhancing the wear resistance of high-entropy alloys. By tuning the distribution and composition of two phases, nano-precipitates are formed, leading to a self-organized nano-laminated microstructure and extensive hardening. Additionally, the nano-precipitates facilitate the formation of continuous and compacted glaze layers, reducing the wear rate.
Article
Engineering, Multidisciplinary
Hui Chen et al.
Summary: This study fabricated tungsten-based composites with improved mechanical properties by using a novel binder and laser metal deposition technique. The results showed that the composites exhibited excellent strength and plasticity at room temperature due to the unique microstructure of the solid solution.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Chemistry, Physical
Hao Zhang et al.
Summary: CoCrNiTa0.1 medium-entropy alloy shows outstanding yield strength of 1339 MPa, much higher than CoCrNi alloy, due to the combined effects of fine grain strengthening and precipitation strengthening. The alloy consists of Ta-enriched Laves phase and fine-grained face-centered cubic (FCC) phase, with small grains contributing to superior fine grain strengthening. The precipitated Ta-enriched Laves phase greatly enhances the alloy's mechanical strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Peng Hua et al.
Summary: This study investigates shear-induced amorphization in nanocrystalline NiTi micropillars through compression experiments. It is found that the micropillars exhibit high deformability with notable amorphization and crystal refinement in the shear bands. The shear-induced amorphization initiates from the local martensite phase near grain boundaries through the accumulation of crystalline defects. Additionally, the suppression of nanovoid formation enables large plastic deformation in the nanocrystalline NiTi micropillars.
Article
Metallurgy & Metallurgical Engineering
Zhitao Yu et al.
Summary: High sintering temperature improves mechanical properties and wear resistance of Cu/WS2 composites, but results in a high friction coefficient; low sintering temperature leads to excellent self-lubrication performance, but with weaker mechanical properties.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Jiashi Miao et al.
Summary: A CrCoNi based medium entropy alloy with small additions of Ti, Al and Nb (denoted as (CrCoNi)(93)Al4Ti2Nb) exhibits comparable tensile properties to equiatomic CrCoNi alloy. Spatially-localized long range ordering (LRO) L1(2) domains are found in this alloy, where deformation occurs by the slip of a/2 <110> dislocations and leading dislocations glide as pairs in slip bands due to the existence of LRO domains. Multipoles are formed through dislocation slip with opposite signs on adjacent {111} slip planes, serving as building blocks for subgrain structures consisting of fine slip bands.
Article
Multidisciplinary Sciences
Hao Wang et al.
Summary: In situ straining transmission electron microscopy experiments on the Cantor high-entropy alloy (HEA) of CrMnFeCoNi demonstrate a crystalline-to-amorphous phase transformation in ultrafine-grained microstructures. The increase of crack-tip dislocation densities due to high lattice friction and grain boundary resistance triggers the transformation. The formation of amorphous nanobridges in the crack wake dissipates strain energies, providing effective toughening mechanisms for HEAs.
Article
Engineering, Multidisciplinary
Fei Weng et al.
Summary: The study found that the variation in oxide content in CoCrNi medium entropy alloys affects their cryogenic tensile properties. Oxides have a certain impact on the mechanical properties of the alloy, while twin boundaries play a compensatory role in performance. Additionally, the mechanical properties are improved at low temperatures.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Multidisciplinary Sciences
Chang Liu et al.
Summary: The authors present a 'reactive wear protection' strategy to achieve superior wear resistance through the in situ formation of strong and deformable oxide nanocomposites on a surface induced by friction. This strategy offers a pathway for designing ultra-wear resistant alloys by turning brittle oxides into strong and deformable surfaces for improving wear resistance.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Shiteng Zhao et al.
Summary: High-entropy alloys (HEAs) show remarkable material properties under harsh conditions, with structures containing stacking faults, twins, transformation between crystal structures, and amorphization being generated through plastic deformation processes.
Article
Materials Science, Multidisciplinary
Kaisheng Ming et al.
Article
Chemistry, Physical
Qing Zhou et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Nanoscience & Nanotechnology
Muxin Yang et al.
SCRIPTA MATERIALIA
(2019)
Article
Materials Science, Multidisciplinary
Cun-hong Yin et al.
Article
Materials Science, Multidisciplinary
Wei Guo et al.
Article
Chemistry, Physical
Tria Laksana Achmad et al.
JOURNAL OF ALLOYS AND COMPOUNDS
(2017)
Article
Engineering, Multidisciplinary
Meng-Hao Chuang et al.
COMPOSITES PART B-ENGINEERING
(2017)
Article
Materials Science, Multidisciplinary
J. Miao et al.
Article
Materials Science, Multidisciplinary
G. Laplanche et al.
Article
Thermodynamics
Qihua Wang et al.
Article
Multidisciplinary Sciences
Bernd Gludovatz et al.
NATURE COMMUNICATIONS
(2016)
Article
Materials Science, Multidisciplinary
M. Q. Jiang et al.
Article
Nanoscience & Nanotechnology
Yanqiu Zhang et al.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2013)
Review
Materials Science, Multidisciplinary
Mingwei Chen
NPG ASIA MATERIALS
(2011)
Article
Physics, Multidisciplinary
X. L. Wu et al.
PHYSICAL REVIEW LETTERS
(2009)
Article
Materials Science, Multidisciplinary
Guang-Ping Zheng et al.
Article
Physics, Applied
Adam Revesz et al.
JOURNAL OF APPLIED PHYSICS
(2006)
Article
Chemistry, Multidisciplinary
HQ Li et al.
ADVANCED MATERIALS
(2006)
Article
Physics, Multidisciplinary
A Meldrum et al.
PHYSICAL REVIEW LETTERS
(2002)
