The Effect of Microstructural Changes Induced by Annealing on Mechanical Properties of FeCoCrMoCBY Bulk Glassy Alloy

Bulk metallic glasses have interesting mechanical properties, such as high strength up to 5 GPa, high elastic strain and many other additional desirable properties. However, BMGs beyond the elastic region fail catastrophically on one dominant shear band and show little macroscopic plasticity in an apparently brittle manner. Nano-crystallized BMGs have been found to possess better ductility comparing with brittle parent BMGs. Annealing treatment of glassy alloys is a useful method to prepare bulk nano-crystalline alloys. In the present study, the crystallization trend of the FeCoCrMoCBY alloy which is claimed to have the best glass forming ability was studied in various times in temperature ranges of a) between Tg (glassy temp.) and Tx1 (first crystallization temp.), and b) between Tx1 and Tx2 (second crystallization temp.). The influences of different annealing time and temperatures on the microstructure and microhardness of Fe41Co7Cr15Mo14Y2C15B6BMG are reported in this paper.

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Synthesis of New Ni-Ta-Based Bulk Glassy Alloy with High Fracture Strength of over 3000 MPa

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.1421 ◽

2007 ◽

Vol 561-565 ◽

pp. 1421-1424

Author(s):

Wei Zhang ◽

Kunio Arai ◽

J. Qiang ◽

C. Qin ◽

F. Jia ◽

...

Keyword(s):

Glassy Alloy ◽

High Strength ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

High Fracture ◽

Glass Forming ◽

Glassy Alloys ◽

Bulk Glassy Alloy ◽

Ti Content

The addition of Ti and Zr to Ni-Ta binary alloys is effective for the increase in stabilization of supercooled liquid and glass-forming ability (GFA). As the Ti content increases, the supercooled liquid region Tx and reduced glass transition temperature (Tg/Tl) of Ni60Ta40-xTix glassy alloys increase, show maximum values of 63 K at 20 at.%Ti and 0.589 at 25 at.%Ti, respectively, and then gradually decrease. The addition of 5 at.% Zr to Ni-Ta-Ti alloys lowers liquidus temperature (Tl), resulting in the higher Tg/Tl values of 0.600. The best GFA were obtained for Ni60Ta15Ti20Zr5 and Ni60Ta20Ti15Zr5 alloys and the glassy alloy samples with a diameter of 1.0 mm were fabricated. The new Ni-Ta-based bulk glassy alloys exhibit high Tg of ~897 K, large ΔTx of ~74 K, high strength of over 3180 MPa with plastic strains of ~0.4% and excellent corrosion resistance in 1 N HCl solution.

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Effect of Co Addition on the Glass-Forming Ability and Mechanical Properties of Ti-Zr-Be-Cu-Co Bulk Amorphous Alloys

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.182-183.203 ◽

2012 ◽

Vol 182-183 ◽

pp. 203-207

Author(s):

Zhong Yuan Suo ◽

Yan Ling Song ◽

Ke Qiang Qiu

Keyword(s):

Mechanical Properties ◽

Glassy Alloy ◽

Glass Forming Ability ◽

Yield Strain ◽

Scanning Calorimetry ◽

High Fracture ◽

Glass Forming ◽

Transmission Electron ◽

Bulk Glassy Alloy ◽

Co Addition

The effect of Co substitution for Be on the glass-forming ability and mechanical properties was investigated in Ti35Zr30Be27.5-xCu7.5Cox (x=0, 3.5, 7.5, 11.5 at.%) alloys by using X-ray diffractometry (XRD), differential scanning calorimetry (DSC), high-resolution transmission electron microscopy (HRTEM) and compression test. With the substitution of Co for Be, glass-forming ability (GFA) is significantly enhanced and fully amorphous rods with a diameter of up to 12 mm were produced in the alloy with 3.5 and 7.5 at.% Co. The Ti35Zr30Be24Cu7.5Co3.5 bulk glassy alloy exhibits good plasticity of 4% during compressive applied load at ambient temperature in conjunction with distinct yield strain of 2% and high fracture strength of 2196 MPa. The effect of the addition of Co on the structure and deformation behavior of the Ti35Zr30Be27.5-xCu7.5Cox (x=0, 3.5, 7.5, 11.5 at.%) alloys is discussed.

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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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High glass-forming ability and good mechanical properties of new bulk glassy alloys in Cu–Zr–Ag ternary system

Journal of Materials Research ◽

10.1557/jmr.2006.0020 ◽

2006 ◽

Vol 21 (1) ◽

pp. 234-241 ◽

Cited By ~ 76

Author(s):

W. Zhang ◽

A. Inoue

Keyword(s):

Mechanical Properties ◽

Ternary System ◽

Glassy Alloy ◽

Alloy System ◽

Supercooled Liquid ◽

Glass Forming Ability ◽

Liquid Region ◽

Glass Forming ◽

Glassy Alloys ◽

Wide Range

The addition of Ag to Cu–Zr alloys is very effective for the increase in the stability of supercooled liquid as well as the glass-forming ability (GFA). The large supercooled liquid region (ΔTx) exceeding 60 K in Cu–Zr–Ag ternary system was obtained in a wide range of 25–55 at.% Cu, 40–65 at.% Zr, and 5–25 at.% Ag. The best GFA was obtained around Cu45Zr45Ag10, and glassy alloy rods with diameters up to 6.0 mm were formed by copper mold casting. The bulk glassy alloys exhibit good mechanical properties, i.e., compressive fracture strength of 1780–1940 MPa, Young's modulus of 106–112 GPa, compressive plastic elongation of 0.2–2.9%, and Vickers hardness of 534–599. The finding of the new Cu–Zr–Ag ternary glassy alloy system with high GFA and good mechanical properties is important for development and scientific studies of bulk glassy alloys.

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A Ti-based bulk glassy alloy with high strength and good glass forming ability

Intermetallics ◽

10.1016/j.intermet.2010.02.036 ◽

2010 ◽

Vol 18 (10) ◽

pp. 1837-1841 ◽

Cited By ~ 33

Author(s):

Ke-Fei Xie ◽

Ke-Fu Yao ◽

Tian-You Huang

Keyword(s):

Glassy Alloy ◽

High Strength ◽

Glass Forming Ability ◽

Glass Forming ◽

Bulk Glassy Alloy

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Mechanical properties of Fe-based bulk glassy alloys in Fe–B–Si–Nb and Fe–Ga–P–C–B–Si systems

Journal of Materials Research ◽

10.1557/jmr.2003.0205 ◽

2003 ◽

Vol 18 (6) ◽

pp. 1487-1492 ◽

Cited By ~ 122

Author(s):

A. Inoue ◽

B. L. Shen ◽

A. R. Yavari ◽

A. L. Greer

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Vickers Hardness ◽

Glassy Alloy ◽

High Strength ◽

Deformation Mode ◽

Soft Magnetic Materials ◽

Elastic Plastic ◽

Glassy Alloys ◽

Hardness Tests

Mechanical properties of cast Fe-based bulk glassy alloy rods with compositions of (Fe0.75B0.15Si0.1)96Nb4 and Fe77Ga3P9.5C4B4Si2.5 were examined by compression and Vickers hardness tests. The Young's modulus (E), yield strength (σy), fracture strength (σf), elastic strain (εe), fracture strain (εf), and Vickers hardness (Hv) were 175 GPa, 3165 MPa, 3250 MPa, 1.8%, 2.2%, and 1060, respectively, for the former alloy and 182 GPa, 2980 MPa, 3160 MPa, 1.9%, 2.2%, and 870, respectively, for the latter alloy. The εf /E and Hv/3E were 0.019–0.017 and 0.020–0.016, respectively, for the alloys, in agreement with the previous data for a number of bulk glassy alloys. The agreement suggests that these Fe-based bulk glassy alloys have an elastic–plastic deformation mode. The syntheses of high-strength Fe-based bulk glassy alloys with distinct compressive plastic strain and elastic–plastic deformation mode are encouraging for future development of Fe-based bulk glassy alloys as structural and soft magnetic materials.

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Enhancement of plasticity in Ti-rich Ti–Zr–Be–Cu–Ni–Ta bulk glassy alloy via introducing the structural inhomogeneity

Journal of Materials Research ◽

10.1557/jmr.2008.0357 ◽

2008 ◽

Vol 23 (11) ◽

pp. 2984-2989 ◽

Cited By ~ 22

Author(s):

Jin Man Park ◽

Do Hyang Kim ◽

Ki Buem Kim ◽

Eric Fleury ◽

Min Ha Lee ◽

...

Keyword(s):

Glassy Alloy ◽

Shear Bands ◽

Structural Inhomogeneity ◽

Glassy Matrix ◽

Premature Failure ◽

Glassy Alloys ◽

Alloy Chemistry ◽

Bulk Glassy Alloy ◽

Heterogeneous Microstructures ◽

Micrometer Scale

The effect of microstructural inhomogeneities with different length scale on the plasticity of (Ti45Zr16Be20Cu10Ni9)100–xTax (x = 0, 5, and 10) bulk glassy alloys has been studied. The formation of specific heterogeneous microstructures with a different type of structural inhomogeneity, i.e., short-/medium-range ordered clusters or micrometer-scale ductile dendrites combined with a glassy matrix, evolved by appropriately tuning the alloy chemistry, improves the room temperature plasticity up to ∼12.5% and ∼15%, respectively. The pronouncedly enhanced plasticity is mainly attributed to the retardation of shear localization and multiplication of shear bands by controlling the plastic and failure instabilities otherwise responsible for premature failure.

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