Deformation behavior of Zr- and Ni-based bulk glassy alloys

2007 ◽  
Vol 22 (4) ◽  
pp. 1087-1092 ◽  
Author(s):  
Dmitri V. Louzguine-Luzgin ◽  
Yuqiao Zeng ◽  
Albertus Deny Heri Setyawan ◽  
Nobuyuki Nishiyama ◽  
Hidemi Kato ◽  
...  
Keyword(s):  
Structural Changes ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
Shear Bands ◽  
High Energy ◽  
Nucleation And Growth ◽  
Cubic Phase ◽  
Glassy Alloys ◽  
Microcrack Propagation ◽  
Bulk Glassy Alloy

This article presents a comparative study of the deformation-induced structural changes observed within a glassy phase in two different Zr- and Ni-based alloys. Ductile Zr65Al7.5Ni10Pd17.5 bulk glassy alloy, which exhibits dynamic nanocrystallization forming a crystalline cubic phase within shear bands on plastic deformation, is presumed to contain pre-existing nuclei. On the contrary, no obvious dynamic nanocrystallization is observed within the shear bands in the glassy phase of the Ni50Pd30P20 bulk alloy, which, however, contains clear medium-range order zones on the order of 1 nm in size in an as-solidified state. This alloy exhibits nucleation and growth-transformation behavior on heating. At the same time, clear nucleation and growth of the cubic Ni-based phase are observed near the microcrack area in the deformed sample. High energy released at the time of the microcrack propagation caused nanocrystallization and blockage of the crack-tip propagation.

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

2008 ◽  
Vol 23 (11) ◽  
pp. 2984-2989 ◽  
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.

Investigation of a ductile and corrosion-resistant Pd79Au1.5Ag3Si16.5 bulk metallic glass

2010 ◽  
Vol 25 (10) ◽  
pp. 1943-1949
Author(s):  
N. Chen ◽  
C.L. Qin ◽  
G.Q. Xie ◽  
D.V. Louzguine-Luzgin ◽  
A. Inoue
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
High Thermal Stability ◽  
Corrosion Resistant ◽  
Excellent Corrosion Resistance ◽  
Potential Applications ◽  
Bulk Glassy Alloy ◽  
High Degree

A new Pd79Au1.5Ag3Si16.5 bulk metallic glass was successfully synthesized in a maximum casting thickness range to 3 mm. Upon heating, the single glassy phase decomposed into Pd-rich crystalline phases and a Si-rich amorphous phase due to solute partitioning. In addition to high thermal stability, this bulk glassy alloy also exhibited a high degree of ductility and excellent corrosion resistance, showing potential applications as biomaterials.

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 (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.

Synthesis and Viscoelasticity of Zr-based Bulk Glassy Alloy Containing ZrC Particles

2000 ◽  
Vol 644 ◽  
Author(s):  
Hidemi Kato ◽  
Tomoya Hirano ◽  
Akihisa Inoue ◽  
Yoshihito Kawamura ◽  
H. S. Chen
Keyword(s):  
Glassy Phase ◽  
Glassy Alloy ◽  
Supercooled Liquid ◽  
Glassy Matrix ◽  
Newtonian Viscosity ◽  
In Situ Reaction ◽  
Glassy Alloys ◽  
Arc Melting ◽  
Mold Casting

AbstractCylindrical composite Zr55Al10Ni5Cu30 bulk glassy alloys containing up to 17.5 vol.% ZrC particles were prepared with using an in-situ reaction forming ZrC between graphite particles with diameters of ∼10 m and Zr metal in molten alloy during arc-melting followed by copper mold casting. Because the in-situ reaction suppresses an agglomeration and segregation among dispersoids in the glassy matrix, mechanical properties of the composite materials at room temperature, especially toughness and plastic elongation, were significantly improved from the Zr55Al10Ni5Cu30 single glassy phase. In order to demonstrate the influence of the dispersed ZrC particles on workability of the supercooled liquid of the alloy, viscous flow behaviors under constant strain-rates were investigated. Although the Newtonian viscosity becomes larger, the composite material has the same viscoelastic properties, i.e., “shear thinning”, and excellent workability as the single glassy phase in spite of the dispersed particles.

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.

Mechanically induced solid-state reaction for synthesizing glassy Co75Ti25 soft magnet alloy powders with a wide supercooled liquid region

2002 ◽  
Vol 17 (9) ◽  
pp. 2447-2456 ◽  
Author(s):  
M. Sherif El-Eskandarany ◽  
Wei Zhang ◽  
A. Inoue
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Ball Milling ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
Supercooled Liquid ◽  
High Energy ◽  
Supercooled Liquid Region ◽  
Liquid Region

A single phase of glassy Co75Ti25 alloy powders was synthesized by high-energy ball milling the elemental powders at room temperature, using the mechanical alloying method. The final product of the glassy alloy, which is obtained after ball milling for 86 ks, exhibits soft magnetic properties with polarization and coercivity values of 0.67 T and 2.98 kA/m, respectively. This binary glassy alloy, in which its glass transition temperature (Tg) lies at a rather high temperature (833 K), transforms into face-centered-cubic Co3Ti (ordered phase) at 889 K through a single sharp exothermic reaction with an enthalpy change of crystallization (ΔHx) of −2.35 kJ/mol. The supercooled liquid region before crystallization ΔTx of the synthesized glassy powders shows an extraordinary high value (56 K) for a metallic binary system. The reduced glass transition temperature [ratio between Tg and liquidus temperatures, Tl (Tg/Tl)] was 0.56. We also demonstrated postannealing experiments of the mechanically deformed Co/Ti multilayered composite powders. The results show that annealing of the powders at 710 K leads to the formation of a glassy phase (thermally enhanced glass formation reaction). Its heat formation was measured directly and found to be −0.56 kJ/mol. The similarity in the crystallization and magnetization behaviors between the two classes of as-annealed and as-mechanically alloyed glassy powders implies the formation of the same glassy phase.

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

2012 ◽  
Vol 488-489 ◽  
pp. 861-865 ◽  
Author(s):  
Amir Seifoddini ◽  
Mahmoud Nili Ahmadabadi ◽  
Saeed Heshmati-Manesh ◽  
Mihai Stoica ◽  
Uta Kuehn ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glassy Alloy ◽  
Annealing Treatment ◽  
High Strength ◽  
Glass Forming ◽  
Glassy Alloys ◽  
Nano Crystalline ◽  
Temperature Ranges ◽  
Macroscopic Plasticity ◽  
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.

Solidification Analyses for the Fabrication of Bulky Multicomponent Metallic Glasses and their Properties

1995 ◽  
Vol 400 ◽  
Author(s):  
Akihisa Inoue ◽  
Yoshiyuki Shinohara ◽  
Yoshihiko Yokoyama
Keyword(s):  
Liquid Crystalline ◽  
Glassy Phase ◽  
Glassy Alloy ◽  
Solidification Condition ◽  
Continuous Cooling ◽  
Arc Melting ◽  
Packed Structure ◽  
Bulk Glassy Alloy ◽  
Solidification Parameters ◽  
Nose Temperature

AbstractThe liquid-crystalline transformation during continuous cooling was examined for a Zr60Al10Ni10Cu15Pd5 alloy which was ejected into a wedge-shape cavity in a copper mold or solidified on a copper hearth by unidirectional arc melting. The structure consists of a glassy phase in the wedge angles smaller than 10 degrees and changes to glassy and crystalline phases in the higher angle range. The start (Cs) and termination (Ct) points for the transformation were determined and the continuous-cooling-transformation (C. C. T. ) curves were constructed. The nose temperature (Tn) and the time (tn) up to the nose point in the C. C. T. curves were 1018 K and 0.93 s. The critical cooling rate for glass formation defined by (Tm-Tn)/tn is 110 K/s. Furthermore, with the aim of clarifying a solidification condition for formation of a bulk glassy alloy by unidirectional arc melting, the relation between the formation of a glassy phase and the solidification parameters of moving velocity of liquid/solid interface (V), temperature gradient (G) and cooling rale (R) was examined. The glassy phase was obtained in the condition of V>3 mm/s, G>4 K/mm and R>40 K/s. The supercooling reaches 385 K at 40 K/s. The large supercooling ability is presumably due to the formation of a highly dense randomly packed structure where the nucleation of a crystalline phase and the atomic rearrangement for growth reaction are difficult.

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.

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