Shear band evolution related with thermal annealing revealing ductile-brittle transition of Zr35Ti30Be27.5Cu7.5 metallic glass under complex stress state

Liu, Xiangkui; Wang, Tianchi; Wang, Qipeng; Song, Xinxiang; Liang, Yuzheng; Feng, Shuai; Yang, Fei; Chen, Xinsheng; Kong, Jian

doi:10.1016/j.intermet.2021.107378

Cited by 9 publications

(6 citation statements)

References 56 publications

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“…This is attributed to the relief of stress accumulated during the rapid quenching process, atomic rearrangement such as chemical short-range ordering, and the initiation of nucleation of α-Fe crystallites [41]. The chemical short-range order of the amorphous structure induces local anisotropy, increasing the coercivity, but it can also increase the brittleness [22,42,43]. Heat treatment above the Curie temperature eliminates the chemical short-range order of the amorphous structure, so pre-annealing was carried out below the Curie temperature; core annealing was carried out above the Curie temperature and below the crystallization temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Annealing below the crystallization temperature of amorphous alloys causes structural relaxation and short-range order changes, which closely affect the mechanical properties of amorphous metals. Generally, amorphous metals become more brittle as the annealing temperature and duration increase, when the temperature remains below the crystallization threshold [22]. As such, the pre-annealing temperature should be sufficiently high to enhance pulverization efficiency but must not exceed the crystallization temperature.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores

Kim,

Lee,

Yang

et al. 2023

Metals

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In this study, we examined the optimal pre- and post-annealing conditions for soft magnetic composites (SMCs) using amorphous flake powders produced through ball milling of amorphous Fe-Si-B ribbons, leading to enhanced magnetic properties. The SMCs, which utilized flake powders created via melt spinning, displayed outstanding DC bias characteristics, as well as increased permeability, primarily due to high saturation magnetization and the flaky morphology of the powders. Pre-annealing was performed not only to remove residual stress formed during the melt spinning process but also to improve pulverizing efficiency, which ultimately affected the particle size of the flake powders. Core annealing was performed to reduce core losses and improve permeability by relieving the residual stress generated during the pressing process. As a result, pre-annealing and core annealing temperatures were identified as crucial factors influencing the magnetic properties of the SMCs. We meticulously analyzed the particle size, the morphology of the flake powder, and the magnetic properties of the SMCs in relation to the annealing temperatures. In conclusion, we demonstrated that flake powder SMCs achieved superior soft magnetic properties, including significantly reduced core loss and heightened permeability, through optimal pre- and core-annealing at 370 °C and 425 °C, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores

Kim,

Lee,

Yang

et al. 2023

Metals

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“…Wear resistance improved with annealing time increases, as a result of good hardness and elastic modulus of materials, which led to too much reduction of friction while plowing the MG layer on an indenter . During annealing, antiwear and low coefficient of friction in all conditions improved on the surface of the film, and there might be dangling bonds (immobilized free radical); therefore, annealing needs to satisfy these bonds by surface reconstruction, charge transfer, or chemical absorption. ,, …”

Section: Resultsmentioning

confidence: 99%

“…42 During annealing, antiwear and low coefficient of friction in all conditions improved on the surface of the film, and there might be dangling bonds (immobilized free radical); therefore, annealing needs to satisfy these bonds by surface reconstruction, charge transfer, or chemical absorption. 32,43,44 3.2.3. Wear Rate.…”

Section: Microstructures and Mechanical Propertiesmentioning

confidence: 99%

Annealing Effect on Mechanical and Tribological Behaviors of Nanoscale Mechanics of Zr₆₀Cu₂₅Al₅Ag₅Ni₅ Thin-Layer Metallic Glasses for Engineering Materials Applications

Muhabie,

Girma

2023

ACS Omega

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A new and unique alloy formulation design strategy has been developed in order to fabricate thin-layered metallic glasses (TLMGs) with superior fracture resistance and low coefficient of friction (COF) during the nanoscratching test. Due to the outstanding properties, TFMG could be applied for different uses, such as for surface coating, biomedical, bioimprinting, electronic devices, spacecraft, and railway, all of which need surface fracture resistance. The fabricated Zr-based metallic glass was prepared from Zr, Al, Cu, Ni, and Ag above 99.9 Wt % in purity by arch melting techniques. TFMGs were coated on silicon wafer by sputtering the vapor deposition method from bulk metallic glass then annealed below glass transition temperature T g ∼ 450 °C for 10, 30, and 60 min. Nanoindentation and nanoscratch tests were used to investigate nanomechanical and nanotribological properties, and atomic force microscopy (AFM) was used to examine the surface morphology and microstructures of TLMG. The nanoindentation data indicated that the average hardness of metallic glasses increased from 9.75 (as-cast MG) to 13.4 GPa (annealed for 60 min). Coefficients of friction for the cast sample, annealed for unannealed, 10, 30, and 60 min, were 0.062, 0.049, 0.039, and 0.03, respectively, as well as the wear depths were 201. 56, 148.43, 37.32, and 25.27 nm, respectively. These studies show that the coefficient of friction and wear rate decreases when the annealing time increases as a result of atomic reordering and structural relaxation that occurred at longer annealing times. Furthermore, continuous wear process, wear depth, wear track volume, and contact area decrease with increasing annealing time. This study can be used to design protocols to prepare novel TLMGs, which have outstanding mechanical and tribological properties for engineering materials applications.

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“…[5][6][7] The plasticity of MGs is recognized by the formation and propagation of localized shear bands along the preferred planes, which may lead to catastrophic failure in the material. [8][9][10] In recent years, some methods such as the microalloying process and rejuvenation have been proposed for improving the plastic behavior of MGs; [11][12][13][14][15] however, it is found that the homogenous plasticity generally comes at the expense of strength in these techniques. The design of specific sample configurations such as the introduction of notches is one of the main processes inducing the high plasticity and the superior strength in the MGs.…”

Section: Introductionmentioning

confidence: 99%

The effects of alloying composition on plasticity and strength of notched metallic glasses

Jasim

ISMAILOV

Opulencia

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Using notch geometry in the metallic glass (MG) samples, it is possible to improve the homogeneous plasticity and mechanical properties. In this work, the molecular dynamics (MD) simulation was performed to indicate how the alloying composition of MGs can tune the mechanical properties of notched samples. For this purpose, CuZr MGs were constructed through atomic-scale simulation with alloying compositions of Cu64Zr36, Cu60Zr40, Cu54Zr46, and Cu50Zr50, while a symmetrical surface notch was produced at the waistline of samples by removing certain atoms and relaxing the new free surfaces. The tensile loading was also carried out to characterize the plastic deformation and strength in the CuZr MGs. According to the results, Cu64Zr36 and Cu60Zr40 alloys exhibited a localized plastic deformation in the notch region, while the decrease in Cu content, i.e. Cu54Zr46, led to the generation of nanoscale shear events outside the notch region and extended the deformation area in the body of the sample. The results also indicated that the change in the mechanism of plastic deformation in the notched samples strongly depended on the type and population of polyhedrons rearranged in the backbone structure. Moreover, it was found that the Voronoi volume in the Cu54Zr46 alloy exhibited a gentle increment under the tensile loading in both the notched and un-notched regions, while the Cu-rich MGs, i.e. Cu64Zr36 and Cu60Zr40, showed a sudden increment of Voronoi volume at the center of the notch region, which was indicative of strain localization in the atomic system.

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Shear band evolution related with thermal annealing revealing ductile-brittle transition of Zr35Ti30Be27.5Cu7.5 metallic glass under complex stress state

Cited by 9 publications

References 56 publications

Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores

Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores

Annealing Effect on Mechanical and Tribological Behaviors of Nanoscale Mechanics of Zr₆₀Cu₂₅Al₅Ag₅Ni₅ Thin-Layer Metallic Glasses for Engineering Materials Applications

The effects of alloying composition on plasticity and strength of notched metallic glasses

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Shear band evolution related with thermal annealing revealing ductile-brittle transition of Zr35Ti30Be27.5Cu7.5 metallic glass under complex stress state

Cited by 9 publications

References 56 publications

Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores

Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores

Annealing Effect on Mechanical and Tribological Behaviors of Nanoscale Mechanics of Zr60Cu25Al5Ag5Ni5 Thin-Layer Metallic Glasses for Engineering Materials Applications

The effects of alloying composition on plasticity and strength of notched metallic glasses

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Annealing Effect on Mechanical and Tribological Behaviors of Nanoscale Mechanics of Zr₆₀Cu₂₅Al₅Ag₅Ni₅ Thin-Layer Metallic Glasses for Engineering Materials Applications