scholarly journals On Glass Forming Ability of Bulk Metallic Glasses by Relating the Internal Friction Peak Value

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 767
Author(s):  
Xianfeng Zhang ◽  
Xiao Cui ◽  
Zhuotong Du ◽  
Fangqiu Zu ◽  
Jinjing Li ◽  
...  
Keyword(s):  
Internal Friction ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Glass Forming Ability ◽  
Liquid Region ◽  
Internal Friction Peak ◽  
Glass Forming ◽  
Constituent Elements ◽  
Valid Criterion ◽  
Peak Value

The internal friction (IF) behaviors of a series of LaCe-, Zr-, and La-based bulk metallic glasses (BMGs) were studied by a computer-controlled, conventional inverted torsion pendulum. The results indicate that with an increasing temperature, the IF also increases gradually in the supercooled liquid region, followed by a decrease caused by crystallization. BMGs with a good glass forming ability (GFA) usually possess a high IF peak value for an alloy system with the same constituent elements. Furthermore, the magnitude of the IF value (Qi−1) of the inflection point is an efficient criterion of GFA. The Qi−1 value is a valid criterion under the conditions of identical constituent elements and different element contents. However, Qi−1 and GFA have no relationship among different alloy systems.

Magnetic Properties and Glass Forming Ability of Fe-B-Y-Nb-Zr Bulk Metallic Glasses

2012 ◽  
Vol 577 ◽  
pp. 27-30 ◽  
Author(s):  
San Xin Wang ◽  
Ze Yu Wu
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid Region ◽  
Glass Forming Ability ◽  
Maximum Diameter ◽  
Liquid Region ◽  
Casting Technique ◽  
Glass Forming

Bulk metallic glasses (BMGs) alloys (Fe71.2B24Y4.8)96Nb4-xZrx (x = 1-4 at.%) with a maximum diameter of 5 mm were synthesized with low purity materials by copper mold casting technique. The effect of Zr substitution for Nb on the structure, thermal stability and the magnetic properties has been studied. It was found that the substitution of an appropriate amount of Zr for Nb can improve the glass forming ability. The wide supercooled liquid region ∆Tx (exceeding 123 K) and a high Tg (exceeding 868 K) demonstrated a high thermal stability of the present Fe-based BMGs. In addition, these BMGs also exhibit good soft magnetic properties with relatively high saturation magnetization of 88 emu/g, and low coercivity of 20 Oe.

GLASS FORMING ABILITY AND KINETIC CHARACTERS OF PARAMAGNETIC Nd60Co40-xAlx(x=5, 10, 15) BULK METALLIC GLASSES

2004 ◽  
Vol 18 (14) ◽  
pp. 679-685 ◽  
Author(s):  
L. XIA ◽  
Y. D. DONG
Keyword(s):  
Glass Transition ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Glass Forming Ability ◽  
Ternary Alloys ◽  
Liquid Region ◽  
Scanning Calorimetry ◽  
Glass Forming

Paramagnetic Nd 60 Co 40-x Al x(x=5, 10, 15) bulk metallic glasses (BMGs) were prepared in the shape of rods 2 mm in diameter by suction casting. The ternary alloys have shown distinct glass transitions in Differential Scanning Calorimetry (DSC) measurements and excellent glass-forming ability. The glass transition and crystallization behaviors as well as their kinetics have been studied. The reduced glass transition temperature and the supercooled liquid region of the alloys were found to increase with the increasing content of Al . The role of Al was discussed. The parameter γ defined by Liu et al. was employed to discuss the glass-forming ability of the alloys and the critical cooling rates as well as the critical section thickness of the alloys were predicted accordingly.

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.

FORMATION OF La-Al-Ni-Cu-Fe BULK METALLIC GLASSES WITH HIGH GLASS-FORMING ABILITY

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2314-2319
Author(s):  
YUNFEI JI ◽  
SHUJIE PANG ◽  
CHAOLI MA ◽  
TAO ZHANG
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Glass Forming Ability ◽  
Main Element ◽  
Heat Of Mixing ◽  
Liquid Region ◽  
Glass Forming ◽  
Cu Alloy

The effect of alloy composition on improving glass-forming ability of La -based alloys is investigated in this work. Previous composition criteria demonstrated that the alloys with high glass-forming ability should have negative heats of mixing among the main constituent elements. In this study, the addition of Fe to a La -based La - Al - Ni - Cu alloy significantly improved the glass-forming ability, although the heat of mixing between Fe and the main element La is positive. La - Al - Ni - Cu - Fe bulk metallic glasses with diameters up to 15 mm were prepared by the method of pouring the molten alloys into a copper mold. These La - Al - Ni - Cu - Fe bulk metallic glasses exhibit relatively wide supercooled liquid region of about 50 k, and high T rg (T g /T l ) and γ(T x /(T g +T l )) values. It is found that the addition of Fe to the La - Al - Ni - Cu alloy lowers the Gibbs free energy difference between the liquid and crystalline phases in the supercooled liquid region and enhances the glass-forming ability of the alloy.

Glass-forming ability and corrosion resistance of Zr-based Zr–Ni–Al bulk metallic glasses

2012 ◽  
Vol 536 ◽  
pp. S117-S121 ◽  
Author(s):  
Y.H. Li ◽  
W. Zhang ◽  
C. Dong ◽  
J.B. Qiang ◽  
G.Q. Xie ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Glass Forming Ability ◽  
Glass Forming

Dilatometric measurements and glass-forming ability in Pr-based bulk metallic glasses

2006 ◽  
Vol 55 (6) ◽  
pp. 517-520 ◽  
Author(s):  
Q.G. Meng ◽  
S.G. Zhang ◽  
J.G. Li ◽  
X.F. Bian
Keyword(s):  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Glass Forming Ability ◽  
Glass Forming

scholarly journals Effect of Sn addition on the glass-forming ability and mechanical properties of Ni-Nb-Zr bulk metallic glasses

2011 ◽  
Vol 56 (36) ◽  
pp. 3926-3931 ◽  
Author(s):  
DengKe Li ◽  
HaiFeng Zhang ◽  
AiMin Wang ◽  
ZhengWang Zhu ◽  
ZhuangQi Hu
Keyword(s):  
Mechanical Properties ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Glass Forming Ability ◽  
Glass Forming
Sign in / Sign up

Export Citation Format

Share Document