scholarly journals Evaluation of the Effect of Minor Additions in the Crystallization Path of [(Fe0.5Co0.5)0.75B0.2Si0.05]100-xMx Metallic Glasses by Means of Mössbauer Spectroscopy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1293
Author(s):  
S. Leila Panahi ◽  
Parthiban Ramasamy ◽  
Francesc Masdeu ◽  
Mihai Stoica ◽  
Joan Torrens-Serra ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Metallic Glasses ◽  
Mossbauer Spectroscopy ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Scanning Calorimetry ◽  
Glass Forming ◽  
Mößbauer Spectroscopy ◽  
Mo Content ◽  
Crystallization Path

Understanding the crystallization of metallic glasses is fundamental in the design of new alloys with enhanced properties and better glass-formability. The crystallization of a series of Fe-based metallic glasses of composition [(Fe0.5Co0.5)0.75B0.2Si0.05]100-xMx (M = Mo, Nb and Zr) has been studied by means of differential scanning calorimetry and transmission Mössbauer spectroscopy. This latter technique allows the following of the microstructural evolution of the studied alloys through the identification and quantification of the several Fe-containing crystalline phases and also through the changes in the amorphous structure at the initial stages of crystallization. The results show that the crystallization products are the same for all the studied compositions (α-Fe, Fe2B, (FeCo)23B6 and a paramagnetic remnant) although with different relative proportions and the crystallization of a phase without Fe in the alloys with Zr. Moreover, the addition of Zr favors the crystallization of α-Fe causing a detrimental effect on the glass forming ability, while the increase in Mo content up to 6 at% favors the crystallization of (FeCo)23B6. The different amount of α-Fe and borides is presented as a measure of the glass forming ability of this type of alloys.

COMPOSITION DESIGN AND GLASS-FORMING ABILITY OF TI-BASED BULK METALLIC GLASSES

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2326-2331 ◽  
Author(s):  
LEI ZHAO ◽  
ZEQIANG ZHANG ◽  
JING ZHANG ◽  
SHUJIE PANG ◽  
CHAOLI MA ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Glassy Alloy ◽  
Bulk Metallic Glasses ◽  
Critical Diameter ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Liquid Region ◽  
Scanning Calorimetry ◽  
Composition Design ◽  
Glass Forming

Ti -based bulk metallic glasses (BMGs) have great potential for use as structural materials due to their excellent mechanical properties. How to fabricate Ti -based metallic glasses with sufficient large size has always been the key issue in both the theoretic and technology aspects since finding the BMG. In this paper, we try to fabricate Ti -based metallic glasses with high glass-forming ability (GFA) through composition design based on various empirical ideas. BMG alloy with composition of Ti 43.89 Cu 43.60 Zr 6.75 Ni 5.76 was synthesized based on the deep eutectic idea, and the critical diameter of this glassy alloy reaches to 2 mm. The GFA of this alloy was further improved by small addition of Si (0.5-1 at %). BMG rods with diameters up to 3mm were synthesized for compositions of Ti 42.89 Cu 43.60 Zr 6.75 Ni 5.76 Si 1, Ti 43.89 Cu 43.60 Zr 6.25 Ni 5.76 Si 0.5 and Ti 43.89 Cu 43.60 Zr 6.75 Ni 4.76 Si 1. The amorphous structure of all the samples was confirmed by X-ray diffraction (XRD) method. The thermal stability associated with glass transition, supercooled liquid region and crystallization was investigated by differential scanning calorimetry (DSC). Possible mechanisms for the improvement of GFA were discussed.

MÖssbauer Study of a Tinife Shape Memory Alloy.

1991 ◽  
Vol 246 ◽  
Author(s):  
M. Jimenez ◽  
V. Marquina ◽  
S. Aburto ◽  
M.L. Marquina ◽  
R. Gomez ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Shape Memory ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Density Wave ◽  
Quadrupole Doublet ◽  
Mössbauer Study ◽  
Scanning Calorimetry ◽  
Mößbauer Spectroscopy ◽  
Wave Induced

AbstractMÖssbauer spectroscopy is very sensitive to structural transitions that may occur during a phase change of the type known to arise in the shape memory TiNiFe alloy. In this work we present the results of resistance vs temperature, differential scanning calorimetry (DSC) and Mössbauer spectroscopy (MS) measurements in Ti50Ni47Fe3 sample. The resistance vs temperature curve shows the usual sharp increase associated to the B2 → R transition at Tp = 245 K and then raises until a maximum is attained at ∼ 150 K. The DSC curve shows a peak maximum at the same temperature where the resistivity starts to increase. The room temperature Mössbauer spectrum consists of a single line, indicating that the iron atoms have cubic surroundings. As temperature is lowered, a small asymmetric quadrupole doublet begins to develop. The isomer shift (I.S.) and quadrupole splitting (ΔQ) values of this doublet increase with decreasing temperature until almost constant values are achieved at temperatures ∼ 100 K. We relate the changes in the Mössbauer spectra with previously proposed charge density wave induced premartensitic transition.

Effect of Minor Si and Ag Additions on Glass-Forming Ability of Ti-Cu-Co-Zr-Sn-Be Bulk Metallic Glass

2011 ◽  
Vol 688 ◽  
pp. 400-406
Author(s):  
Xin Fang Zhang ◽  
Hong Xiang Li ◽  
Zhi Qiang Jiang ◽  
Seong Hoon Yi
Keyword(s):  
Metallic Glass ◽  
Metallic Glasses ◽  
Base Alloy ◽  
Maximum Size ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Copper Mold ◽  
Glass Forming ◽  
Splat Quenching ◽  
Ag Additions

Effect of Minor Si and Ag additions on glass-forming ability (GFA) of the base Ti44Cu38.9Co4Zr6Sn2Be5.1(at. %) alloy are studied. (Ti44Cu38.9Co4Zr6Sn2Be5.1)100-xRx(R = Si, Ag, x=0, 1, 2, 3 at. %) metallic glasses are formed by splat-quenching and copper mold suction casting. It is found that the minor Si and Ag additions enhance the glass-forming ability of Ti44Cu38.9Co4Zr6Sn2Be5.1greatly. The maximum size of fully amorphous structure is increased from 4 mm for base alloy to be larger than 6 mm for alloys containing 1-2 at. % Si/Ag, while Si/Ag more than 2 at. % additions decrease the GFA.

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