New amorphous alloys with high strength and good bend ductility in the MgNiNd system

1995 ◽  
Vol 48 (1-4) ◽  
pp. 489-493 ◽  
Author(s):  
Y. Li ◽  
S.C. Ng ◽  
C.K. Ong ◽  
H. Jones
Keyword(s):  
Amorphous Alloys ◽  
High Strength ◽  
Bend Ductility

Investigation of Amorphous/Crystalline State in Cu-Hf-Al Alloys

2010 ◽  
Vol 649 ◽  
pp. 87-92
Author(s):  
E. Nagy ◽  
Viktória Rontó ◽  
Jenő Sólyom ◽  
András Roósz
Keyword(s):  
Amorphous Alloys ◽  
Great Influence ◽  
Amorphous State ◽  
High Strength ◽  
Al Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Different Shapes ◽  
Important Purpose

Cu-Hf-Al alloys are considered to be relatively new ones among Cu-based bulk amorphous alloys. Cu-Hf-Al alloys have high strength in amorphous state and this property makes many applications feasible for the industry. During the production of amorphous alloys the most important purpose is to produce them in the biggest diameter to make them suitable for a wide range of applications. The circumstances of the production process have a great influence on the developing structure. In the present work solidification of Cu-Hf-Al alloys were investigated. The alloys were cast into different shapes with different Al contents with special regard to the appearance of the amorphous/crystalline structure. The appearance and the structure of crystalline phases were determined by X-ray diffraction and X-ray, DSC and metallographic measurements were used to investigate the developing structure.

Structural Relaxation of Open Volume in Hyper-Eutectic Zr-Cu-Al Bulk Amorphous Alloys Measured by Positron Annihilation

2017 ◽  
Vol 373 ◽  
pp. 130-133
Author(s):  
Taishi Ishiyama ◽  
Kazukui Kobayashi ◽  
Yoshihiko Yokoyama ◽  
Toyohiko J. Konno ◽  
Akihiro Iwase ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Structural Relaxation ◽  
Amorphous Alloys ◽  
Density Measurement ◽  
High Strength ◽  
Eutectic Alloys ◽  
Ordered Structure ◽  
Compositional Dependence ◽  
Scanning Calorimetry ◽  
Bulk Amorphous Alloys

The Zr-Cu-Al bulk amorphous (BA) alloys, which have no long-range ordered structure, possess various properties such as high strength and toughness with compositional dependence. In the present study, in order to estimate the natures of local structure change and relaxation behavior of hyper-eutectic BA alloys during annealing, positron annihilation measurements and density measurement have been performed for hyper-eutectic Zr-Cu-Al BA alloys with annealing. The enthalpy relaxation and structural relaxation was also measured by differential scanning calorimetry (DSC) measurement. These results show that the relaxation process of free volume containing in hyper-eutectic BA alloys is different from that in hypo-eutectic alloys.

Structure and Mechanical Behaviour of Al-Sc Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 567-572
Author(s):  
Yu.V. Milman
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloys ◽  
Mechanical Behavior ◽  
Mechanical Behaviour ◽  
Amorphous Alloys ◽  
High Strength ◽  
Glass Forming Ability ◽  
Superplastic Behavior ◽  
Glass Forming

The review of the works devoted to the influence of scandium on the structure, mechanical behavior and corrosion resistance of aluminum alloys is given. The wrought thermally non-hardenable alloys of Al- Mg system and thermally hardenable high-strength alloys of Al-Zn- Mg-Cu system are considered. The influence of Sc on the glass forming ability of amorphous alloys and on the superplastic behavior of aluminum alloys is discussed.

BULK AMORPHOUS AND NANOSTRUCTURED MATERIALS BY HIGH ENERGY BALL MILLING

2008 ◽  
Vol 22 (18n19) ◽  
pp. 2905-2913 ◽  
Author(s):  
CONSTANTIN POLITIS
Keyword(s):  
Ball Milling ◽  
Nanostructured Materials ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Glassy State ◽  
High Strength ◽  
Supercooled Liquid ◽  
High Energy ◽  
High Energy Ball Milling ◽  
Energy Ball

Mechanical alloying by high energy ball milling is a promising method for the production of bulk metallic glasses, amorphous alloys and nanostructured materials. Amorphous alloys reinforced by nanocrystals represent a big step in the optimization of new ultra high strength materials. Nano-scale W-Y solid solutions were synthesized by high energy ball milling. Only 1 at. % oxygen can stabilize the bulk metallic glassy state of Zr 54 Cu 19 Ni 8 Al 8 Si 5 Ti 5 O 1 to higher T x and to large supercooled liquid range Δ T xg .

Mg–Ca–Zn Bulk Metallic Glasses with High Strength and Significant Ductility

2005 ◽  
Vol 20 (8) ◽  
pp. 1935-1938 ◽  
Author(s):  
X. Gu ◽  
G.J. Shiflet ◽  
F.Q. Guo ◽  
S.J. Poon
Keyword(s):  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Mass Density ◽  
High Strength ◽  
Light Metal ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
Bulk Amorphous Alloys ◽  
Specific Strength ◽  
Glass Forming

The development of Mg–Ca–Zn metallic glasses with improved bulk glass forming ability, high strength, and significant ductility is reported. A typical size of at least 3–4 mm amorphous samples can be prepared using conventional casting techniques. By varying the composition, the mass density of these light metal based bulk amorphous alloys ranges from 2.0 to 3.0 g/cm3. The typical measured microhardness is 2.16 GPa, corresponding to a fracture strength of about 700 MPa and specific strength of around 250–300 MPa cm3/g. Unlike other Mg- or Ca-based metallic glasses, the present Mg–Ca–Zn amorphous alloys show significant ductility.

Bulk Glass Formation in an Fe-Based Fe–Y–Zr–M (M = Cr, Co, Al)–Mo–B System

2004 ◽  
Vol 19 (3) ◽  
pp. 921-929 ◽  
Author(s):  
Z.P. Lu ◽  
C.T. Liu ◽  
C.A. Carmichael ◽  
W.D. Porter ◽  
S.C. Deevi
Keyword(s):  
Metallic Glasses ◽  
Glass Formation ◽  
Amorphous Alloys ◽  
High Strength ◽  
Supercooled Liquid ◽  
Glass Forming Ability ◽  
Bulk Glass ◽  
Bulk Amorphous Alloys ◽  
Glass Forming ◽  
Hardness Values

Several new bulk metallic glasses based on Fe–Y–Zr–(Co, Cr, Al)–Mo–B, which have a glass-forming ability superior to the best composition Fe61Zr10Co7Mo5W2B15 reported recently, have been successfully developed. The as-cast bulk amorphous alloys showed a distinctly high thermal stability with glass-transition temperatures above 900 K, supercooled liquid regions above 60 K, and high strength with Vickers hardness values larger than HV 1200. The suppression of the growth of primary phases in the molten liquids and the resultant low liquidus temperatures were found to be responsible for the superior glass-forming ability in these new alloys. It was found that the addition of 2% Y not only facilitated bulk glass formation, but the neutralizing effect of Y with oxygen in the molten liquids also improved the manufacturability of these amorphous alloys.

Conchoidal Fracture of Zr- and Mg-Based Amorphous Glass

2017 ◽  
Vol 891 ◽  
pp. 504-508
Author(s):  
Jozef Miškuf ◽  
Kornel Csach ◽  
Alena Juríková ◽  
Mária Huráková ◽  
Martin Miškuf ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Shear Bands ◽  
High Strength ◽  
Fracture Surfaces ◽  
Conchoidal Fracture ◽  
Final Failure ◽  
Complex Shear ◽  
Amorphous Glass ◽  
Surface Morphologies

In metallic glasses plastic deformation occurs via the creation and the propagation of a softened region in the shear bands. Some of the high strength metallic glasses (as Zr-based metallic alloys) exhibit complex shear band topography and the final failure respects the allocation of the shear bands. We studied the differences in the fracture surfaces of Zr-and Mg-based amorphous alloys. Ductile behaviour of the shear bands in Zr-based amorphous alloy tends to the dimple creation during the failure. On the fracture surfaces the vein pattern morphology manifestations were present. Conchoidal fracture was typical for Mg-based amorphous glass. Two different surface morphologies, plumes and rib marks ornament the fracture surfaces.

RETRACTED – Formation and properties of Zr-based bulk quasicrystalline alloys with high strength and good ductility

2000 ◽  
Vol 15 (10) ◽  
pp. 2195-2208 ◽  
Author(s):  
A. Inoue ◽  
T. Zhang ◽  
M. W. Chen ◽  
T. Sakurai ◽  
J. Saida ◽  
...  
Keyword(s):  
Amorphous Alloys ◽  
Single Phase ◽  
Exothermic Reaction ◽  
High Strength ◽  
Dispersion Strengthening ◽  
Mixed Structure ◽  
Future Opportunity ◽  
Two Stages ◽  
Crystallization Mode ◽  
Strength And Ductility

The crystallization mode of the Zr–Al–Ni–Cu amorphous alloys changed from a single stage to become two stages by the addition of Ag or Pd, and the first-stage exothermic reaction was found to result from the precipitation of nanoscale icosahedral particles with a size of 20 to 50 nm. The precipitation took place by high nucleation and low growth rates in a polymorphous mode for the Ag-containing alloys, and a diffusioncontrolled mode for the Pd-containing alloys. The nanoscale mixed structure alloys exhibited improved strength and ductility as compared with the corresponding amorphous single-phase alloys. The findings of the dispersion strengthening as well as the dispersion ductilization gave a future opportunity to fabricate a new bulk nonequilibrium phase alloy by use of the new phenomenon.

Dynamic Compacting of Powders of Some Amorphous Alloys

2005 ◽  
Vol 903 ◽  
Author(s):  
Victor A. Golubev ◽  
Andrey V. Strikanov ◽  
Aleksey V. Golubev ◽  
Vladimir G. Bugrov ◽  
Grigory A. Potemkin ◽  
...  
Keyword(s):  
Amorphous Alloys ◽  
Amorphous State ◽  
High Hardness ◽  
High Strength ◽  
Xrd Analysis ◽  
Soft Magnetic ◽  
Electrical And Magnetic Properties ◽  
Explosive Devices ◽  
Soft Magnetic Amorphous Alloys ◽  
Magnetic Conductivity

AbstractAt present amorphous metallic alloys have the broad expansion in various fields of science&engineering as a result of their unique properties. In particular, soft magnetic amorphous alloys are extensively used in electrical engineering. However the production of considerable-size nonporous wares based on the powders (or tapes) of these alloys is heavy problem owing to high hardness of the particles. Therefore shock wave’s compacting or Dynamic Compacting (DC) method is promising one to produce the wares on the base of powders of amorphous alloys because it can provides high strength and near zero porosity of the wares. The experimental D-U diagrams of soft magnetic amorphous alloys were obtained to realize this method of compacting. The calculations of the amplitude and duration of shock wave were carried out. The several versions of explosive devices using shock plane wave generator to produce circular magnetic conductors were developed and were tested. These magnetic conductors are based on amorphous alloys of 5BDSR, GM414, 10NSR trademarks (Fe with Cu, Nb, Si, B additives). XRD analysis proved that amorphous state of the alloys remains the same up to 20 GPa shock wave’s pressures. The mechanical, structural, electrical and magnetic properties both initial amorphous alloys and compacted one were obtained and compared as a result of the implemented works. It was stated that DC leads to increase of magnetic conductivity by factor ∼15 with respect to initial amorphous alloys powder. Besides the specific losses decrease in ∼4 times.

High-strength amorphous alloys with carbide strengthening

1992 ◽  
Vol 34 (9) ◽  
pp. 548-551
Author(s):  
A. M. Glezer ◽  
Yu. E. Chicherin ◽  
V. I. Shvarts ◽  
S. V. Shalin
Keyword(s):  
Amorphous Alloys ◽  
High Strength ◽  
Carbide Strengthening
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