Synthesis and Properties of High-Manganese Iron-Based Bulk Amorphous Metals as Non-Ferromagnetic Amorphous Steel Alloys

2002 ◽  
Vol 754 ◽  
Author(s):  
S. Joseph ◽  
Gary J. Shiflet ◽  
V. Ponnambalam ◽  
Veerle M. Keppens ◽  
R. Taylor ◽  
...  
Keyword(s):  
Magnetic Transition ◽  
High Strength ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Austenitic Steels ◽  
Amorphous Metals ◽  
Liquid Region ◽  
High Manganese ◽  
Steel Alloys ◽  
Iron Based

ABSTRACTHigh-manganese ferrous-based alloys containing 10–20 at. % Mn have been investigated as prospective iron-based structural amorphous metals with magnetic transition temperatures far below the ambient temperature. Many of these alloys are found to have a high reduced glass transition temperature of 0.6–0.63 and large supercooled liquid region of 40–90 °C. Rod-shaped amorphous samples with diameters reaching 4 mm are obtained by employing simple injection casting. The search for good glass-forming alloys has been guided by an atomistic approach coupled with the realization of low-lying liquidus temperatures via proper alloying. The tensile yield strengths and Vickers hardness of the new amorphous metals far exceed those known in high-strength steel alloys, and the elastic moduli are comparable to those reported for super-austenitic steels. The present high-manganese amorphous Fe-alloys also show promise as very good corrosion-resistant materials.

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.

New Cu-Based Bulk Metallic Glasses with High Strength of 2000 MPa

2004 ◽  
Vol 449-452 ◽  
pp. 945-948 ◽  
Author(s):  
Seung Y. Shin ◽  
J.H. Kim ◽  
D.M. Lee ◽  
Jong K. Lee ◽  
H.J. Kim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Amorphous Alloys ◽  
Ternary Phase Diagram ◽  
High Strength ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Bulk Amorphous Alloy ◽  
Liquid Region ◽  
Mold Casting ◽  
Application Fields

New Cu-based bulk amorphous alloys exhibiting a large supercooled liquid region and good mechanical properties were formed in a quaternary Cu-Ni-Zr-Ti systems consisting of only metallic elements. The compositional range for the formation of the amorphous alloys that have high glass forming ability (GFA) (> 3 mm diameter) and large supercooled liquid region (> 50 K) is defined in the pseudo-ternary phase diagram Cu-Ni-(Zr, Ti). A bulk amorphous Cu54Ni6Zr22Ti18alloy with the diameter of 6 mm can be prepared by copper mold casting. The Cu54Ni6Zr22Ti18alloy shows glass transition temperature (Tg) of 712 K, crystallization temperature (Tx) of 769 K and supercooled liquid region (ΔTx) of 57 K. The Cu54Ni6Zr22Ti18alloy exhibits high compressive fracture strength of about 2130 MPa with a plastic strain of about 1.5 %. The new Cu-based bulk amorphous alloy with high GFA and good mechanical properties allows us to expect the extension of application fields as a new engineering material.

Ultrahigh strength Al-based amorphous alloys containing Sc

2004 ◽  
Vol 19 (5) ◽  
pp. 1539-1543 ◽  
Author(s):  
Akihisa Inoue ◽  
Shintaro Sobu ◽  
Dmitri V. Louzguine ◽  
Hisamichi Kimura ◽  
Kenichiro Sasamori
Keyword(s):  
Amorphous Alloy ◽  
Amorphous Alloys ◽  
Glassy Alloy ◽  
High Strength ◽  
Supercooled Liquid ◽  
Enthalpy Of Mixing ◽  
Supercooled Liquid Region ◽  
Tensile Fracture ◽  
Liquid Region ◽  
Constraint Force

Amorphous metallic alloys possess high strength characteristics, which are superior to crystalline materials. Here we report an influence of Sc addition on glass-forming ability, glass-transition behavior, supercooled liquid region, and mechanical properties of an Al84Y9Ni5Co2 glassy alloy. This paper also aims to present a promising (Al0.84Y0.09Ni0.05Co0.02)95Sc5 amorphous alloy. This alloy has an ultrahigh tensile fracture strength exceeding 1500 MPa, which surpasses those for all the other Al-based fully crystalline and amorphous alloys reported to date, in addition to high Young’s modulus of 78 GPa. The fracture surface of this new alloy exhibited vein pattern typical for amorphous alloys with good ductility, and multiple shear bandswere observed on the lateral surface. The ultrahigh tensile strength of the (Al0.84Y0.09Ni0.05Co0.02)95Sc5 amorphous alloy results from an increase in the interatomic constraint force by the addition of Sc, an element having highly negative enthalpy of mixing with Al, Ni, and Co and the highest chemical affinity with Al among the alloying elements.

High-Strength Bulk Nanostructure Alloys Consisting of Compound and Amorphous Phases

1998 ◽  
Vol 554 ◽  
Author(s):  
Akihisa Inoue ◽  
Cang Fan
Keyword(s):  
Particle Size ◽  
Amorphous Phase ◽  
Volume Fraction ◽  
High Strength ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Interparticle Spacing ◽  
Liquid Region ◽  
Good Ductility ◽  
Bulk Nanocrystalline

AbstractBulk nanocrystalline alloys with good ductility and high tensile strength (σ f) in Zr-Al-Cu- Pd and Zr-Al-Cu-Ni-Ti systems were formed by partial crystallization of cast bulk amorphous alloys. The nanostructure alloys consist of Zr2(Cu, Pd) or (Zr, Ti)2Al surrounded by the remaining amorphous phase. The particle size and interparticle spacing of their compounds are less than 10 and 2 nm, respectively. The crystallization of a Zr60Al10Cu30 amorphous alloy occurs by the simultaneous precipitation of Zr2Al and Zr2Cu with a large particle size of 500 nm and hence the addition of Pd or Ti is effective for formation of the nanostructure. The Pd or Ti has much larger negative heats of mixing against Zr or Al, respectively, and the Zr-Pd or Ti-Al atomic pair seems to act as preferential nucleation sites leading to the primary precipitation of Zr2(Cu, Pd) or (Zr, Ti) 2Al. The nanostructure alloy cylinders of 2 to 3 mm in diameter keep good ductility in the volume fraction (Vf) range of the compounds below 40 %. The σ f and Young's modulus (E) increase from 1760 MPa and 81.5 GPa, respectively, at Vf=40 % to 1880 MPa and 89.5 Gpa, respectively, at Vf =40 % for the Zr60Al10Cu20Pd10 alloy and from 1830 MPa and 89.0 GPa, respectively, at Vf =0 % to 1940 MPa and 95.2 GPa, respectively, at Vf =28 % for the Zr53Al12Cu20Ni10Ti5 alloy. The formation of the bulk nanostructure alloys with high σ f is presumably due to the reentrance of free volumes into the remaining amorphous phase caused by quenching from the supercooled liquid region.

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 Investigation of the Structural Heterogeneity and Corrosion Performance of the Annealed Fe-Based Metallic Glasses

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 929
Author(s):  
Dandan Liang ◽  
Jo-Chi Tseng ◽  
Xiaodi Liu ◽  
Yuanfei Cai ◽  
Gang Xu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Passive Film ◽  
Metallic Glasses ◽  
Function Analysis ◽  
Supercooled Liquid ◽  
Structural Heterogeneity ◽  
Coordination Shell ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Corrosion Performance

This study investigated the structural heterogeneity, mechanical property, electrochemical behavior, and passive film characteristics of Fe–Cr–Mo–W–C–B–Y metallic glasses (MGs), which were modified through annealing at different temperatures. Results showed that annealing MGs below the glass transition temperature enhanced corrosion resistance in HCl solution owing to a highly protective passive film formed, originating from the decreased free volume and the shrinkage of the first coordination shell, which was found by pair distribution function analysis. In contrast, the enlarged first coordination shell and nanoscale crystal-like clusters were identified for MGs annealed in the supercooled liquid region, which led to a destabilized passive film and thereby deteriorated corrosion resistance. This finding reveals the crucial role of structural heterogeneity in tuning the corrosion performance of MGs.

scholarly journals Effects of Annealing on Enthalpy Recovery and Nanomechanical Behaviors of a La-Based Bulk Metallic Glass

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 579
Author(s):  
Ting Shi ◽  
Lanping Huang ◽  
Song Li
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Structural Relaxation ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Nanoindentation Measurement

Structural relaxation and nanomechanical behaviors of La65Al14Ni5Co5Cu9.2Ag1.8 bulk metallic glass (BMG) with a low glass transition temperature during annealing have been investigated by calorimetry and nanoindentation measurement. The enthalpy release of this metallic glass is deduced by annealing near glass transition. When annealed below glass transition temperature for 5 min, the recovered enthalpy increases with annealing temperature and reaches the maximum value at 403 K. After annealed in supercooled liquid region, the recovered enthalpy obviously decreases. For a given annealing at 393 K, the relaxation behaviors of La-based BMG can be well described by the Kohlrausch-Williams-Watts (KWW) function. The hardness, Young’s modulus, and serrated flow are sensitive to structural relaxation of this metallic glass, which can be well explained by the theory of solid-like region and liquid-like region. The decrease of ductility and the enhancement of homogeneity can be ascribed to the transformation from liquid-like region into solid-like region and the reduction of the shear transition zone (STZ).

Fabrication of large-size Fe-based glassy cores with good soft magnetic properties by spark plasma sintering

2003 ◽  
Vol 18 (9) ◽  
pp. 2115-2121 ◽  
Author(s):  
Baolong Shen ◽  
Akihisa Inoue
Keyword(s):  
Magnetic Properties ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Liquid Region ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Large Size ◽  
High Relative Density ◽  
Plasma Sintering ◽  
Spark Plasma

Glassy Fe65Co10Ga5P12C4B4 alloy powders with a large supercooled liquid region of 50 K before crystallization were synthesized in the particle size range below 125 μm by Ar gas atomization. With the aim of developing a large-size Fe-based glassy core with good soft magnetic properties, the consolidation method of spark plasma sintering was applied to the Fe65Co10Ga5P12C4B4 glassy powders. The existence of the supercooled liquid region enabled us to form a large-size glassy alloy disc 20 mm in diameter and 5 mm in thickness with a high relative density of 99.7% at the glass-transition temperature of 723 K and under the external applied pressure of 300 MPa. The resulting glassy core of 18 mm in outer diameter, 10 mm in inner diameter, and 4 mm in thickness exhibits good soft magnetic properties: 1.20 T for saturation magnetization, 6 A/m for coercive force, and 8900 for maximum permeability. The good soft magnetic properties of the Fe-based bulk glassy core are attributed to the combination of the high relative density and the maintenance of the single glassy structure.

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