Ni-based bulk glassy alloys with large supercooled liquid region exceeding 90K

Formation of bulk Fe-based glassy alloys with high corrosion resistance was succeeded in the Fe75–x–yCrxMoyC15B10 alloy system. A large temperature interval of supercooled liquid region (ΔTx) of 40–90 K was obtained over a wide composition range for the Fe75?x–yCrxMoyC15B10 alloys. The Fe75–x–yCrxMoyC15B10 alloys were prepared in a bulk glassy form with diameters of 1.0–2.5 mm by copper mold casting. The bulk glassy Fe75–x–yCrxMoyC15B10 alloys exhibited high corrosion resistance in 1 N HCl solution. The glassy alloys containing Cr were spontaneously passivated with a wide passive region before the transpassive dissolution of Cr. The passive current density decreased significantly with an increase of alloying Cr content, indicating that the addition of Cr was effective on enhancing the corrosion resistance. Excess addition of Mo for replacing Fe in the present alloys was detrimental for the corrosion resistance.

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(Fe,Co,Ni)–B–Si–Nb Bulk Glassy Alloy With Super-High Strength and Some Ductility [Article Retracted]

Journal of Materials Research ◽

10.1557/jmr.2005.0001 ◽

2005 ◽

Vol 20 (1) ◽

pp. 1-5 ◽

Cited By ~ 17

Author(s):

Baolong Shen ◽

Akihisa Inoue

Keyword(s):

Plastic Strain ◽

Glassy Alloy ◽

Functional Materials ◽

High Strength ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

Glassy Alloys ◽

Strength Alloy ◽

Bulk Glassy Alloy

Glassy [(Fe0.8Co0.1Ni0.1)0.75B0.2Si0.05]96Nb4 alloy rods with glass transition temperature of 835 K, followed by a large supercooled liquid region of 55 K were produced in the diameter range up to 2 mm by copper mold casting. The glassy alloy rods exhibit super-high true fracture strength of 4225 MPa combined with elastic strain of 0.02 and true plastic strain of 0.005. The super-high strength alloy simultaneously exhibits high magnetization of 1.1 T, low coercivity of 3 A/m, and high permeability of 1.8 × 104 at 1 kHz. The success of synthesizing a super-high strength Fe-based bulk glassy alloy with some compressive plastic strain and good soft magnetic properties is encouraging for future development of Fe-based bulk glassy alloys as new engineering and functional materials.

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Static and Dynamic Thermal Properties of a Pd40Ni40Si20 Glassy Alloy

Metals ◽

10.3390/met9111157 ◽

2019 ◽

Vol 9 (11) ◽

pp. 1157

Author(s):

Ludmil Drenchev ◽

Tony Spassov ◽

Georgi Stefanov ◽

Akihisa Inoue ◽

Stoyko Gyurov

Keyword(s):

Thermal Properties ◽

Glassy Alloy ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Dynamic Measurement ◽

Measurement Methods ◽

Liquid Region ◽

Transport Barrier ◽

Glassy Alloys ◽

Atomic Transport

The thermal properties of a Pd40Ni40Si20 glassy alloy with the largest supercooled liquid region among the glassy alloys containing Si as a metalloid element are studied using static and dynamic measurement methods. The relatively wide supercooled liquid region of 45 K, defined by the temperature interval between the glass transition temperature (Tg) and the onset temperature of crystallization (Tx), and the viscosity of the supercooled liquid, varying from 2.7 × 1010 to 3.2 × 1011 Pa·s, make this glass suitable for the introduction of controlled pores by a viscous flow in the temperature range Tg~Tx. The obtained activation energy for crystallization, 272 ± 19 kJ/mol, is slightly higher than that of Tg (228 ± 11 kJ/mol), indicating the dominant contribution of the atomic transport barrier in the overall energy barrier for crystallization.

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Glass-forming ability and magnetic properties of CoFeMoYB bulk glassy alloys with large supercooled liquid region

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2010.03.043 ◽

2010 ◽

Vol 504 ◽

pp. S132-S134 ◽

Cited By ~ 4

Author(s):

Qikui Man ◽

Huaijun Sun ◽

Yaqiang Dong ◽

Baolong Shen ◽

Hisamichi Kimura ◽

...

Keyword(s):

Magnetic Properties ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Glass Forming Ability ◽

Liquid Region ◽

Glass Forming ◽

Glassy Alloys

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Fabrication of Cu–Zr–Ag–Al glassy alloy samples with a diameter of 20 mm by water quenching

Journal of Materials Research ◽

10.1557/jmr.2008.0183 ◽

2008 ◽

Vol 23 (5) ◽

pp. 1452-1456 ◽

Cited By ~ 27

Author(s):

Wei Zhang ◽

Qingsheng Zhang ◽

Akihisa Inoue

Keyword(s):

Glassy Alloy ◽

Supercooled Liquid ◽

Underlying Mechanism ◽

Melting Behavior ◽

Supercooled Liquid Region ◽

Water Quenching ◽

Liquid Region ◽

Glass Forming ◽

Glassy Alloys ◽

Mold Casting

The melting behavior, thermal stability, and glass-forming ability (GFA) of Cu84−xZrxAg8Al8 (x = 42 to 50) glassy alloys were investigated. The alloy with x = 46 exhibits the highest reduced glass transition temperature (Trg). However, the best GFA was obtained for alloy with x = 48 corresponding to the largest supercooled liquid region (ΔTx) and a deep eutectic composition. At the best GFA composition, full glassy samples with diameters of over 20 mm could be fabricated by injection copper mold casting and water quenching without flux. The underlying mechanism of the unusual GFA of the alloy is discussed.

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Formation and properties of new Cu-based bulk glassy alloys with critical diameters up to 1.5 cm

Journal of Materials Research ◽

10.1557/jmr.2009.0344 ◽

2009 ◽

Vol 24 (9) ◽

pp. 2935-2940 ◽

Cited By ~ 8

Author(s):

Wei Zhang ◽

Qingsheng Zhang ◽

Chunling Qin ◽

Akihisa Inoue

Keyword(s):

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

Copper Mold ◽

High Fracture ◽

Al Content ◽

Glass Forming ◽

Copper Mold Casting ◽

Glassy Alloys ◽

Mold Casting

New Cu-based bulk glassy alloys (BGAs) with high glass-forming ability (GFA) were synthesized in a Cu-Zr-Al-Ag system. As the compositions of Cu-Zr-Al-Ag alloys with lower Ag and Al content shifted to the Cu-rich range, the supercooled liquid region, reduced glass transition temperature, and γ value increased, leading to the improvement of GFA. The best GFA is located around Cu47Zr45Al5Ag3, which is close to eutectic. Fully glassy samples with diameters up to 15 mm were fabricated by copper mold casting. These Cu-based BGAs exhibit excellent mechanical properties under compression. A large Young's modulus of 104–111 GPa, high fracture strength of 1905–1942 MPa, and distinct plastic strain of 0.002–0.011 were obtained. Additionally, the BGAs also show good corrosion resistance in 1 N H2SO4 solution.

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