Mössbauer study of structural defects in metallic glasses

1987 ◽  
Vol 35 (1-4) ◽  
pp. 659-662 ◽  
Author(s):  
Ajay Gupta ◽  
R. P. Verma ◽  
S. N. Kane ◽  
S. Lal
Keyword(s):  
Metallic Glasses ◽  
Structural Defects ◽  
Mössbauer Study

Point Defects, Recovery Kinetics and Ordering in Irradiated Bulk Metallic Glasses

2007 ◽  
Vol 1048 ◽  
Author(s):  
Yuri Petrusenko ◽  
Alexander Bakai ◽  
Valeriy Borysenko ◽  
Dmitro Barankov ◽  
Oleksandr Astakhov ◽  
...  
Keyword(s):  
Point Defects ◽  
Metallic Glasses ◽  
Electrical Resistance ◽  
Amorphous Solids ◽  
Structural Defects ◽  
Thermally Activated ◽  
Local Ordering ◽  
Defect Mobility ◽  
Kinetics Of ◽  
Thermally Activated Process

AbstractThe problem of structural properties and structural defects of amorphous solids is still of vital importance. To make clear whether stable point defects exist in metallic glasses (MGs) or not, we have studied the accumulation and recovery kinetics of radiation defects in ZrTiCuNiBe and ZrTiCuNiAl bulk MGs irradiated with 2.5 MeV electrons at T ∼ 80 K. The electrical resistance measurements of the irradiated samples were performed. The recovery spectrum of irradiation-induced electrical resistance was measured for the 85–300 K temperature range. The most important result of the recovery experiments is that they clearly show the annealing stages for the irradiated samples. Two annealing peaks located at T∼150 K and T∼225 K are resolved for ZrTiCuNiBe glass. Similar peaks are also revealed for ZrTiCuNiAl. It can be concluded from the data that the defect mobility is a thermally activated process, and that the activation energy is not as high as that for vacancies in crystalline alloys. Thus, the data obtained testify in favor of the structure with “perfect” local ordering of atoms. It should be noted that this property is basic in the formulation of the polycluster model of amorphous solids.

Mössbauer study of long time annealed Fe30Ni44Cr4Mo2Si5B15 metallic glasses

1990 ◽  
Vol 55 (1-4) ◽  
pp. 1065-1069
Author(s):  
I. Škorvánek ◽  
M. Miglierini ◽  
J. Kováč ◽  
A. Zentko
Keyword(s):  
Metallic Glasses ◽  
Mössbauer Study ◽  
Long Time

Intrinsic structural defects on medium range in metallic glasses

2016 ◽  
Vol 75 ◽  
pp. 36-41 ◽  
Author(s):  
X. Huang ◽  
Z. Ling ◽  
Y.J. Wang ◽  
L.H. Dai
Keyword(s):  
Metallic Glasses ◽  
Structural Defects ◽  
Medium Range

Mössbauer study of plastic deformation in some magnetic metallic glasses

1984 ◽  
Vol 56 (12) ◽  
pp. 3485-3489 ◽  
Author(s):  
Ajay Gupta ◽  
S. Lal ◽  
R. P. Verma
Keyword(s):  
Plastic Deformation ◽  
Metallic Glasses ◽  
Mössbauer Study

Positron lifetime and mössbauer study of Fe80-xNixB20 metallic glasses

1989 ◽  
Vol 113 (1) ◽  
pp. K143-K145 ◽  
Author(s):  
S. Balúch ◽  
M. Miglierini ◽  
R. Gröne ◽  
J. Sitek
Keyword(s):  
Metallic Glasses ◽  
Positron Lifetime ◽  
Mössbauer Study

Granulation of Bulk Metallic Glass Forming Alloys as a Feedstock for Thermoplastic Forming and their Compaction into Bulk Samples

2016 ◽  
Vol 879 ◽  
pp. 589-594 ◽  
Author(s):  
David Geissler ◽  
Jacob Grosse ◽  
Sven Donath ◽  
David Ehinger ◽  
Mihai Stoica ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid ◽  
Amorphous Structure ◽  
Supercooled Liquid Region ◽  
Structural Defects ◽  
Liquid Region ◽  
Brittle Behavior ◽  
Technological Approach

The various technologically important properties of metallic glasses are intimately connected to their amorphous structure that lacks the archetypical structural defects of polycrystalline metals and alloys, i.e. dislocations and grain boundaries. However, the amorphous structure also limits the application potential of this class of materials because of a macroscopically brittle behavior and size limitations. Consequently, with some exceptions, at least one dimension for technological products is limited to a few millimeters or even less. With the presented technological approach this drawback will be addressed. Our first results on several alloys show that with a dedicated instrumentation amorphous granulates can be successfully produced. By hot pressing in the supercooled liquid region, these granulates can be compacted into bulk shapes in the cm range. Further, due to the low viscosity of the supercooled liquid state, this technology disposes of a high formability. It is demonstrated that not only compact samples but also complex shapes in near net shape geometry can be produced. Results on the mechanical properties and microstructure will be discussed and related to important processing issues. Even though this technological approach does not directly address the second drawback of bulk metallic glasses, i.e. catastrophic failure due to highly localized shear bands, it is believed that this route offers possible pathways to improve this issue as well and, most important, to offer a technological route for implementing bulk metallic glasses into products of rather arbitrary shape and larger size.

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