Crystallization behavior and machining properties of annealed Fe–Si–B–Cr amorphous alloys

Kuji, Chieko; Takenaka, Kana; Mizutani, Masayoshi; Shimada, Keita; Kuriyagawa, Tsunemoto; Konno, Toyohiko J.

doi:10.1007/s10853-021-06346-7

Cited by 10 publications

(2 citation statements)

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“…The broad peak of XRD patterns indicates that an analyzed material has amorphous [51] or nanocrystalline structure [52,53]. Kuji et al [54] reported that metals with amorphous or nanocrystalline structures showed higher hardness as compared to those with a micrometer-sized crystalline structure. In addition, the result of Fig.…”

Section: Effect Of Heat Diffusion On Metallographic Structure Of Unir...mentioning

confidence: 99%

Friction Reduction by Laser Irradiation for a Friction System Using Bearing Steel and Aluminum Alloy in Engine Oil

Ihara

Adachi

2022

Tribology Online

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Aluminum alloy sliding components are widely used in internal combustion engines. However, aluminum easily adheres to the countersurface, resulting in high friction. Hence, laser irradiation was used to oxidize the aluminum surface and promote tribofilm formation using molybdenum dithiocarbamate and zinc dialkyldithiophosphate (ZnDTP). This study investigated laser irradiation to reduce friction between steel balls and aluminum disks in fully formulated engine oil. Laser scanning was used to create 100-μm-pitch concentric circles on the disks. The friction behavior was classified into two modes: no friction reduction (mode-I, μ: 0.09-0.12) and friction reduction after the high-friction period (mode-II, μ: 0.06-0.09). Friction mode transition occurred when the laser energy density exceeded the critical value (E c ). Energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy showed that, for mode-I, aluminum adhered to the ball, and no sulfur-containing tribofilm formed. For mode-II, the ZnDTP-derived phosphate film formed on the disk suppressed aluminum adhesion, and a sulfur-containing tribofilm formed on the ball. Micro-Vickers tests and X-ray diffraction showed that an amorphous/nanocrystalline structure formed in the unirradiated area owing to heat diffusion under high-energydensity laser irradiation (>E c ). Results suggest that metallographic structural change in the unirradiated area promotes ZnDTP reactions, causing the mode transition.

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Section: Effect Of Heat Diffusion On Metallographic Structure Of Unir...mentioning

confidence: 99%

Friction Reduction by Laser Irradiation for a Friction System Using Bearing Steel and Aluminum Alloy in Engine Oil

Ihara

Adachi

2022

Tribology Online

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“…The purpose is to reduce hardness and improve machinability, reduce residual stress, stabilize dimensions, and reduce deformation and cracking tendencies. Thermal, structural, and mechanical analyses show that the early reaction sequence of the amorphous alloy after annealing is characterized by structural relaxation, heterogeneous nucleation of the surface α-Fe (Si) phase, and homogeneous nucleation of the metastable Fe3B nuclei, which is influenced by the α-encircled Fe shell [4]. Danylyak analyzed the thermal stability and crystallization kinetic parameters of Fe 82 Nb 2 B 14 REM 2 (REM = Y, Gd, Tb, or Dy) amorphous metal alloys by differential scanning calorimetry.…”

Section: Related Workmentioning

confidence: 99%

Amorphous Alloys and Ferroelectric Nanomaterials and the Repair of Athletic Ligament Injuries in Soccer

Ma¹

2022

Journal of Nanomaterials

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Amorphous alloy refers to the orderly arrangement of the internal structure of various substances in nature. Amorphous solid materials include amorphous inorganic materials, amorphous polymers, and amorphous alloys. Amorphous alloys, also known as glassy alloys or metallic glasses, are atomically condensed, long-range disordered, and short-range ordered alloy materials that have the distinctive properties of both metals and glasses. Ligament injury is damage caused by different degrees of damage to the ligaments of a certain part of the body. The purpose of this paper is to investigate amorphous alloys and ferroelectric nanomaterials and the repair of athletic ligament injuries in the soccer game, using the excellent properties of amorphous alloys and ferroelectric nanomaterials to solve the problem of athletic injuries. Knee and ankle injuries and muscle strains account for a large percentage of soccer injuries. In this paper, researches and explorations have been conducted on the preparation of new composite magnetic nanomaterials, the construction of immunosensor interfaces, and the development of new signal amplification and renewable immunosensors. The rehabilitation effect of the medial collateral ligament of the athlete’s knee joint is used as the research object, and various methods are used. In-depth investigation and research and statistical analysis of the data obtained one by one were carried out. The experimental results in this article show that from the age of ligament injury, the number of people between 18 and 20 is relatively small, and the number of people aged 20–40 is relatively large. The number of people who have been trained for three years and above is 5, and the proportion of ligament injuries is 0.8%; the number of training for two years is 33, and the proportion of ligament injuries is 13.7%, the number of training for one year is 98, and the proportion of ligament injuries is 40.7%, and the number of training for six months is 105, and the proportion of ligaments is 44.8%.

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Blanked Surface Characteristics of Amorphous Alloys with Local Microstructure Modification by Ultrashort Pulsed Laser

Kuji

2024

Lecture Notes in Mechanical Engineering

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Crystallization behavior and machining properties of annealed Fe–Si–B–Cr amorphous alloys

Cited by 10 publications

References 50 publications

Friction Reduction by Laser Irradiation for a Friction System Using Bearing Steel and Aluminum Alloy in Engine Oil

Friction Reduction by Laser Irradiation for a Friction System Using Bearing Steel and Aluminum Alloy in Engine Oil

Amorphous Alloys and Ferroelectric Nanomaterials and the Repair of Athletic Ligament Injuries in Soccer

Blanked Surface Characteristics of Amorphous Alloys with Local Microstructure Modification by Ultrashort Pulsed Laser

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