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

Bulk Metallic Glasses

2008 ◽  
Vol 604-605 ◽  
pp. 229-238
Author(s):  
Marcello Baricco ◽  
Tanya A. Başer ◽  
Gianluca Fiore ◽  
Rafael Piccin ◽  
Marta Satta ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Metallic Glasses ◽  
Amorphous Alloys ◽  
Shear Bands ◽  
Bulk Metallic Glasses ◽  
Rapid Quenching ◽  
Second Phase ◽  
Research Activity ◽  
Long Time ◽  
Geometrical Constraints

Rapid quenching techniques have been successfully applied since long time for the preparation of metallic glasses in ribbon form. Only in the recent years, the research activity addressed towards the synthesis of bulk metallic glasses (BMG), in form of ingots with a few millimetres in thickness. These materials can be obtained by casting techniques only for selected alloy compositions, characterised by a particularly high glass-forming tendency. Bulk amorphous alloys are characterised by a low modulus of elasticity and high yielding stress. The usual idea is that amorphous alloys undergo work softening and that deformation is concentrated in shear bands, which might be subjected to geometrical constraints, resulting in a substantial increase in hardness and wear resistance. The mechanical properties can be further improved by crystallisation. In fact, shear bands movement can be contrasted by incorporating a second phase in the material, which may be produced directly by controlled crystallisation. Soft magnetic properties have been obtained in Fe-based systems and they are strongly related to small variations in the microstructure, ranging from a fully amorphous phase to nanocrystalline phases with different crystal size. The high thermal stability of bulk metallic glasses makes possible the compression and shaping processes in the temperature range between glass transition and crystallisation. Aim of this paper is to present recent results on glass formation and properties of bulk metallic glasses with various compositions. Examples will be reported on Zr, Fe, Mg and Pd-based materials, focussing on mechanical and magnetic properties.

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

scholarly journals Effects of Ag, Nd, and Yb on the Microstructures and Mechanical Properties of Mg‒Zn‒Ca Metallic Glasses

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 856 ◽  
Author(s):  
Zhuofan Liang ◽  
Lianzan Yang ◽  
Yongyan Li ◽  
Xi Wang ◽  
Chunling Qin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Metallic Glasses ◽  
Amorphous Matrix ◽  
Critical Size ◽  
Alloy System ◽  
Amorphous Structure ◽  
High Microhardness ◽  
Long Time ◽  
New Ideas

Mg‒Zn‒Ca metallic glasses are regarded as promising biodegradable materials. Previous studies on this alloy system have mostly focused on the composition regions with a large critical size (Dc) for the formation of metallic glasses, while this paper investigates the composition regions with a small Dc, which has been overlooked by researchers for a long time. The effects of the addition of Ag, Nd, and Yb elements on the microstructure and mechanical properties of Mg‒Zn‒Ca metallic glasses were studied. It was found that the Mg‒Zn‒Ca metallic glass exhibits a single and uniform amorphous structure with a compressive strength of 590 MPa. After the addition of a small amount of Ag into the alloy, the amorphous matrix is retained and new precipitate phases that lead to the decrease of the compressive strength are formed. The addition of the rare earth elements Nd and Yb changes the microstructure from a single amorphous matrix to a large number of quasicrystal phases, which results in an increase in compressive strength. The compressive strength of the Mg‒Zn‒Ca‒Yb alloy increases to 606.2 MPa due to the formation of multi-layered swirling solidified structure and a large number of small quasicrystals with high microhardness. Moreover, this study can be considered as a useful supplement to the existing studies on the Mg‒Zn‒Ca alloy system; it also provides new ideas for designing the microstructure and spatial structure of quasicrystal containing alloys with high performances.

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

Mössbauer study of Fe‐substituted Co‐Zr and Cu‐Zr metallic glasses

1990 ◽  
Vol 68 (1) ◽  
pp. 269-274 ◽  
Author(s):  
C. Michaelsen ◽  
M. Meyer ◽  
H. C. Freyhardt
Keyword(s):  
Metallic Glasses ◽  
Mössbauer Study
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