Effects of Minor Additions on Ni- and Be-Free Ti-Based Bulk Glassy Alloys

We investigated the effects of addition elements (Sn, Al, Si, Ag, Fe, Cr) with a small amount on the glass-forming ability, thermal stability and mechanical properties of the Ti-Zr-Cu-Pd glassy alloy system. The results revealed that minor Sn addition improved the glass-forming ability, thermal stability and plasticity, Si addition enlarged the supercooled liquid region, and Fe addition improved the plasticity, while minor additions of Si, Ag, Fe, and Cr lowered the glass-forming ability, and Al and Cr additions were harmful to the plasticity of the Ti-Zr-Cu-Pd glassy alloy system.

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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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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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Glass-forming ability and thermal stability of Fe62Nb8−xZrxB30 and Fe72Zr8B20 amorphous alloys?

Open Physics ◽

10.2478/bf02476275 ◽

2004 ◽

Vol 2 (1) ◽

Cited By ~ 1

Author(s):

M. Shapaan ◽

J. Lábár ◽

L. Varga ◽

J. Lendvai

Keyword(s):

Thermal Stability ◽

Amorphous Alloys ◽

Strong Dependence ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Glass Forming Ability ◽

Partial Replacement ◽

Liquid Region ◽

Glass Forming ◽

Thermal Stability Of

AbstractGlass-forming ability (GFA) and thermal stability of Fe62Nb8B30, Fe62Nb6Zr2B30 and Fe72Zr8B20 at % amorphous alloys were investigated by calorimetric (DSC and DTA) measurements. The crystallization kinetics was studied by DSC in the mode of continuous versus linear heating and it was found that both the glass transition temperature, Tg, and the crystallization peak temperature, Tp, display strong dependence on the heating rate. The partial replacement of Nb by Zr leads to lower Tg and Tx temperatures and causes a decrease of the supercooled liquid region. JMA analysis of isothermal transformation data measured between Tg and Tx suggests that the crystallization of the Fe62Nb8B30 and Fe62Nb6Zr2B30 amorphous alloys take place by three-dimensional growth with constant nucleation rate. Nb enhances the precipitation of the metastable Fe23B6 phase and stabilizes it up to the third crystallization stage. Zr addition increases the lattice constant of Fe23B6 and, at the same time, decreases the grain size.

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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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Glass Forming Ability and Crystallization Behaviors of the Ti-Cu-Ni-(Sn) Alloys with Large Supercooled Liquid Region

MRS Proceedings ◽

10.1557/proc-644-l4.9 ◽

2000 ◽

Vol 644 ◽

Author(s):

Y.C. Kim ◽

S. Yi ◽

W.T. Kim ◽

D.H. Kim

Keyword(s):

Thermal Stability ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Glass Forming Ability ◽

Partial Replacement ◽

Liquid Region ◽

Glass Forming ◽

Melt Spun ◽

Higher Temperature ◽

Co Precipitation

AbstractThe thermal stability and crystallization behavior of melt spun amorphous Ti50Cu35Ni15-xSnx (x=0, 3, 5, 7) alloys has been studied in by thermal analysis (DSC and DTA) and X-ray diffractometry. Partial replacement of Ni by Sn up to 5 at % in Ti50Cu35Ni15 alloy improved thermal stability and glass forming ability. The onset temperature of the first exotherm increased from 739 to 756 K with increasing Sn content x from 0 to 5, and then decreased to 745 K for the alloy with x=7 due to change in crystallization sequence. Melt spun amorphous Ti50Cu35Ni12Sn3 and Ti50Cu35Ni10Sn5 alloys exhibit ΔTx exceeding 78 and 76 K, respectively, which is significantly larger than ΔTx of 46 K in Ti50Cu35Ni15 alloy. Amorphous Ti50Cu35Ni15 alloy crystallized by precipitation of supersaturated cubic Ti(Ni,Cu) phase followed by decomposition into a mixture of TiCu and TiNi at higher temperature. Amorphous Ti50Cu35Ni15-xSnx (x=3, 5) phase crystallized by precipitation of cubic Ti(Ni,Cu) phase, followed by transformation into a mixture of TiNi, TiCu, Ti3Sn phases. Amorphous Ti50Cu32Ni8Sn7 phase crystallized by co- precipitation of cubic Ti(Ni,Cu) phase and unidentified phase, followed by transformation into a mixture of TiNi, TiCu, Ti3Sn phases.

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Effects of Minor Si Addition on Glass Formation and Thermal Stability of Ni Free Ti-Based Bulk Metallic Glass

Materials Science Forum ◽

10.4028/www.scientific.net/msf.750.36 ◽

2013 ◽

Vol 750 ◽

pp. 36-39 ◽

Cited By ~ 6

Author(s):

Sheng Li Zhu ◽

Guo Qiang Xie ◽

Feng Xiang Qin ◽

Xin Min Wang

Keyword(s):

Thermal Stability ◽

Metallic Glass ◽

Bulk Metallic Glass ◽

Glassy Alloy ◽

Supercooled Liquid ◽

Glass Forming Ability ◽

Glass Forming ◽

Si Content ◽

Si Addition ◽

Thermal Stability Of

The effects of small amounts of Si on the glass-forming ability, thermal stability and mechanical property of a TiZrCuPdSn bulk metallic glass were investigated. The addition of Si caused the decrease of glass-forming ability and the increase of the supercooled liquid (SCL) region. With 2 at.% Si addition, a significant SCL region of 80 K was obtained, which indicated high thermal stability of the glassy alloy and was in favor of secondary working by viscous flow deformation. With increasing Si content, the plasticity decreased.

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Compositional Dependence of Thermal Stability and Soft Magnetic Properties for Fe-Al-Ga-P-C-B Glassy Alloys

MRS Proceedings ◽

10.1557/proc-554-155 ◽

1998 ◽

Vol 554 ◽

Cited By ~ 2

Author(s):

T. Mizushima ◽

A. Makino ◽

S. Yoshida ◽

A. Inoue

Keyword(s):

Magnetic Properties ◽

Composition Range ◽

Glassy Alloy ◽

Alloy System ◽

Supercooled Liquid Region ◽

Glass Forming Ability ◽

Liquid Region ◽

Soft Magnetic Properties ◽

Soft Magnetic ◽

Glass Forming

AbstractStructure, glass forming ability and soft magnetic properties for Fe-Al-Ga-P-C-B glassy alloy system were investigated in the compositional range of Fe from 69 to 78 at%, (Al+Ga) from 2 to 12 and (P+C+B) from 17 to 28. The saturation magnetization (σ5) rises gradually with increase of Fe concentration. The maximum value of 70K for supercooled liquid region (ΔTx=Tx-Tg, Tx: crystallization temperature, Tg: glass transition temperature:) and the maximum thickness of 180 μm for glass formation (tmax,) are found in the composition range around Fe=70at% and (Al+Ga)=7at%. The highest permeability (μc) of 20,000 at 1kHz and the lowest coercive force (Hc) of 2 A/m at the sample thickness of 30 μm can be also obtained at this composition. It was ascertained that the composition regions to yield the maximum glass forming ability and lowest magnetostriction were in agreement with that in which the most excellent soft magnetic properties were yielded. This results allow us to assume that the excellent soft magnetic properties for this glassy alloy system in the limited composition range are presumably due to high structural homogeneity resulting from significantly high glass-forming ability.

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Glass-Forming Ability, Crystallized Structure and Magnetic Properties of Fe67Co9.5Nd3Dy0.5B20 Glassy Alloy with Large Supercooled Liquid Region

MATERIALS TRANSACTIONS ◽

10.2320/matertrans.42.2059 ◽

2001 ◽

Vol 42 (10) ◽

pp. 2059-2063 ◽

Cited By ~ 11

Author(s):

Wei Zhang ◽

Mitsuhide Matsusita ◽

Chunfei Li ◽

Hisamichi Kimura ◽

Akihisa Inoue

Keyword(s):

Magnetic Properties ◽

Glassy Alloy ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Glass Forming Ability ◽

Liquid Region ◽

Glass Forming

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Formation and mechanical properties of Cu–Hf–Al bulk glassy alloys with a large supercooled liquid region of over 90 K

Journal of Materials Research ◽

10.1557/jmr.2003.0197 ◽

2003 ◽

Vol 18 (6) ◽

pp. 1435-1440 ◽

Cited By ~ 37

Author(s):

Akihisa Inoue ◽

Wei Zhang

Keyword(s):

Glassy Alloy ◽

Ternary Systems ◽

Supercooled Liquid ◽

Supercooled Liquid Region ◽

Liquid Region ◽

Copper Mold ◽

Glass Forming ◽

Copper Mold Casting ◽

Glassy Alloys ◽

Mold Casting

New Cu-based bulk glassy alloys with large supercooled liquid regions and high mechanical strength were formed in Cu–Hf–Al ternary systems. The large supercooled liquid region exceeding 70 K was obtained in the composition range of 40 at.% Hf at 2.5% Al, 37.5–50% Hf at 5% Al, and 45% Hf at 7.5% Al. The largest supercooled liquid region ΔTx(= Tx – Tg) was 91 K for Cu50Hf45Al5 alloy, and the highest reduced glass-transition temperature was 0.63 for Cu50Hf42.5Al7.5 and Cu52.5Hf40Al7.5 alloys. The alloys with large ΔTx values above 50 K were formed into bulk glassy rods with diameters up to 3 mm by copper mold casting, and the glassy alloy rods exhibited high compressive fracture strength of 2260 to 2370 MPa and Young's modulus of 121 to 128 GPa combined with elastic elongation of 1.9% to 2.0% and plastic elongation of 0.2% to 0.6%. No bulk glassy alloys were formed in the Cu–Hf binary system by copper mold casting, and, hence, the addition of 2.5% to 7.5% Al to Cu–Hf alloys was very effective for increasing glass-forming ability as well as the stabilization of supercooled liquid. The effectiveness can be interpreted on the basis of the concept of the formation of a unique glassy structure in special multicomponent alloys with the three component rules.

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