scholarly journals Formation and mechanical properties of Cu–Hf–Ti bulk glassy alloys [Article Retracted]

2001 ◽  
Vol 16 (10) ◽  
pp. 2836-2844 ◽  
Author(s):  
Akihisa Inoue ◽  
Wei Zhang ◽  
Tao Zhang ◽  
Kei Kurosaka
Keyword(s):  
Fracture Strength ◽  
Glassy Alloy ◽  
Supercooled Liquid Region ◽  
Maximum Diameter ◽  
Tensile Fracture ◽  
Liquid Region ◽  
High Fracture ◽  
Glassy Alloys ◽  
Plastic Elongation ◽  
Bulk Glassy Alloy

High-strength Cu-based bulk glassy alloys were formed in the Cu–Hf–Ti system by the copper mold casting and melt clamp forging methods. The maximum diameter is 4 mm for the Cu60Hf25Ti15 alloy. The substitution of Hf in the Cu60Hf40 alloy by Ti causes an increase in the glass-forming ability (GFA). As the Ti content increases, the glass transition temperature (Tg) decreases, while the crystallization temperature (Tx) shows a maximum at 5% Ti and then decreases, resulting in a maximum supercooled liquid region ΔTx (= Tx − Tg) of 78 K at 5% Ti. The liquidus temperature (T1) has a minimum of 1172 K around 20% Ti, and hence, a maximum Tg//T1 of 0.62 is obtained at 20% Ti. The high GFA was obtained at the compositions with high Tg/T1. The bulk glassy alloy exhibits tensile fracture strength of 2130 MPa, compressive fracture strength of 2160 MPa, and compressive plastic elongation of 0.8 to 1.6%. The new Cu-based bulk glassy alloys with high Tg/T1 above 0.60, high fracture strength above 2100 MPa, and distinct plastic elongation are encouraging for future development as a new type of bulk glassy alloy that can be used for structural materials.

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

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.

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

2005 ◽  
Vol 20 (1) ◽  
pp. 1-5 ◽  
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.

Research on Cu-Based Bulk Glassy Alloys and its Mechanical Properties

2013 ◽  
Vol 329 ◽  
pp. 127-132
Author(s):  
Peng Jun Cao ◽  
Ji Ling Dong ◽  
Hai Dong Wu
Keyword(s):  
Mechanical Properties ◽  
Glassy Alloy ◽  
Testing Machine ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Maximum Diameter ◽  
Liquid Region ◽  
Scanning Calorimetry ◽  
Glassy Alloys ◽  
Ni Alloy

High-strength Cu-based bulk glassy alloys with a large supercooled liquid region in Cu-Zr-Ti-Ni systems were prepared by means of copper mold casting. The Cu-based bulk glassy alloys samples were tested by X-ray diffraction (XRD), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and Instron testing machine. The result indicates, the maximum diameter was 5.0 mm for the Cu55Zr25Ti15Ni5 bulk glassy alloy. The temperature interval of supercooled liquid region (ΔTx) is as large as 45.48-70.98 K for the Cu-Zr-Ti-Ni alloy. The Cu-based glassy alloys rods exhibited the very high mechanical properties and the distinct plastic strains. The compressive fracture strength is 2155 MPa, 2026 MPa and 1904 MPa respectively for Cu50Zr25Ti15Ni10, Cu55Zr25Ti15Ni5 and Cu54Zr22Ti18Ni6 bulk glassy alloys. The Vickers hardness is respectively 674, 678 and 685 for the Cu50Zr25Ti15Ni10, Cu55Zr25Ti15Ni5 and Cu54Zr22Ti18Ni6 bulk glassy alloys. The addition Co element to Cu-Zr-Ti-Ni alloy expand the ΔTx, the ΔTx is 74.5 K for Cu50Zr22Ti18Ni6Co4 bulk glassy alloys.

Preparation and Corrosion Resistance of Cu-Based Bulk Glassy Alloys

2013 ◽  
Vol 652-654 ◽  
pp. 1143-1148
Author(s):  
Peng Jun Cao ◽  
Ji Ling Dong ◽  
Hai Dong Wu ◽  
Pei Geng Fan
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Glassy Alloy ◽  
Maximum Diameter ◽  
Nacl Solution ◽  
Corrosion Condition ◽  
Glassy Alloys ◽  
Weight Method ◽  
Bulk Glassy Alloy ◽  
Better Than

The Cu-based bulk glassy alloys in Cu-Zr-Ti-Ni systems were prepared by means of copper mold casting. The structure and corrosion resistance of Cu-based bulk glassy alloys were analyzed by X-ray diffraction (XRD), differential scanning calorimetry (DSC), electrochemistry method, lost weight method. The result indicates the supercooled liquid temperature interval (ΔTx) is up to 70.98 K for Cu50Zr25Ti15Ni10bulk glassy alloy. The maximum diameter was up to 5.0 mm for the Cu55Zr25Ti15Ni5bulk glassy alloy. For electrochemistry corrosion in 3.5% NaCl solution, self-corrosion electric current density of the Cu50Zr25Ti15Ni10bulk glassy alloys is obviously lower than that of stainless steel and brass, so corrosion resistance of Cu-based bulk glassy alloys is better than stainless steel and brass at the same corrosion condition. The lost weight method showed that the corrosion rate of brass, stainless steel and glassy alloy is respectively 10.08 g/(m2•h), 6.08 g/(m2•h) and 2.19 g/(m2•h) in the 3% NaCl solution, which also indicates that the corrosion resistance of Cu-based bulk glassy alloys is better than stainless steel and brass. The Cu-based bulk glassy alloys can be used in the special field demanding to have the super high strength, hardness and corrosion resistance.

scholarly journals Static and Dynamic Thermal Properties of a Pd40Ni40Si20 Glassy Alloy

Metals ◽  
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.

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

2007 ◽  
pp. 1421-1424
Author(s):  
Wei Zhang ◽  
Kunio Arai ◽  
J. Qiang ◽  
C. Qin ◽  
F. Jia ◽  
...  
Keyword(s):  
Fracture Strength ◽  
Glassy Alloy ◽  
High Fracture ◽  
Bulk Glassy Alloy

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

2008 ◽  
Vol 23 (5) ◽  
pp. 1452-1456 ◽  
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.

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

2009 ◽  
Vol 24 (9) ◽  
pp. 2935-2940 ◽  
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.

Structure and Soft Magnetic Properties of Bulk Fe-Al-Ga-P-C-B-Si Glassy Alloys Prepared by Consolidating Glassy Powders

2000 ◽  
Vol 644 ◽  
Author(s):  
Akihisa Inoue ◽  
Shoji Yoshida ◽  
Takao Mizushima ◽  
Akihiro Makino
Keyword(s):  
Magnetic Properties ◽  
Glassy Alloy ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Soft Magnetic Properties ◽  
Powder Metallurgy Technique ◽  
Soft Magnetic ◽  
High Relative Density ◽  
Bulk Glassy Alloy

AbstractWith the aim of developing a bulk glassy Fe-based alloy with good soft magnetic properties by the powder metallurgy technique, we have applied the pulse current sintering technique to a Fe70Al5Ga2P9.65C5.75B4.6Si3 glassy alloy powder with a large supercooled liquid region of 60K before crystallization. The existence of the supercooled liquid region was found to enable us to form a bulk glassy alloy with a very high relative density of 99%. The resulting bulk glassy alloy exhibits good soft magnetic properties, i.e., 1.17T for flux density at a field of 800A/m, 12.0A/m for coercive force and 8000 for maximum permeability which are much superior to those for the bulk amorphous Fe-Si-B alloy prepared by the same sintering method. The much better soft magnetic properties for the multicomponent Fe-based bulk alloy are attributed to the combination of the high relative density and the unique amorphous structure with the features of high packing density and long-range homogeneous atomic configurations. The first success of forming the bulk amorphous alloy with good soft magnetic properties by the powder metallurgy technique is expected to enable us to use as practical soft magnetic materials.

Sign in / Sign up

Export Citation Format

Share Document