scholarly journals Exploring the Phase Space of Multi-Principal-Element Alloys and Predicting the Formation of Bulk Metallic Glasses

Entropy ◽  
2020 ◽  
Vol 22 (3) ◽  
pp. 292 ◽  
Author(s):  
Mirko Gabski ◽  
Martin Peterlechner ◽  
Gerhard Wilde
Keyword(s):  
Cooling Rate ◽  
Metallic Glasses ◽  
Random Number ◽  
Structural Parameters ◽  
Random Number Generator ◽  
Bulk Metallic Glasses ◽  
Computational Method ◽  
Principal Element ◽  
Critical Cooling Rate ◽  
Glass Forming

Multi-principal-element alloys share a set of thermodynamic and structural parameters that, in their range of adopted values, correlate to the tendency of the alloys to assume a solid solution, whether as a crystalline or an amorphous phase. Based on empirical correlations, this work presents a computational method for the prediction of possible glass-forming compositions for a chosen alloys system as well as the calculation of their critical cooling rates. The obtained results compare well to experimental data for Pd-Ni-P, micro-alloyed Pd-Ni-P, Cu-Mg-Ca, and Cu-Zr-Ti. Furthermore, a random-number-generator-based algorithm is employed to explore glass-forming candidate alloys with a minimum critical cooling rate, reducing the number of datapoints necessary to find suitable glass-forming compositions. A comparison with experimental results for the quaternary Ti-Zr-Cu-Ni system shows a promising overlap of calculation and experiment, implying that it is a reasonable method to find candidates for glass-forming alloys with a sufficiently low critical cooling rate to allow the formation of bulk metallic glasses.

Analysis of the Structure of Bulk Metallic Glasses Using EXELFST

2000 ◽  
Vol 6 (S2) ◽  
pp. 194-195
Author(s):  
F.M. Alamgir ◽  
G. Hug ◽  
D.B. Williams ◽  
H. Jain ◽  
R.B. Schwarz
Keyword(s):  
Cooling Rate ◽  
Metallic Glasses ◽  
Binary Alloys ◽  
Bulk Metallic Glasses ◽  
Rapid Quenching ◽  
Point Of View ◽  
P System ◽  
Critical Cooling Rate ◽  
Minimum Dimension ◽  
Constituent Elements

There has been a rejuvenation of interest in the field of metallic glasses in the last decade, ever since the discovery of alloy compositions which allow bulk glass formation. By definition, bulk metallic glasses (BMGs) are characterized by a critical cooling rate < 10 K/s or a minimum dimension > 1mm. We have chosen to examine the structure of the Pd-Ni-P system in order to explain, from an atomic structural point of view, its precipitously high glass-forming ability in this system with respect to those of the binary alloys. With three constituent elements the study of the Pd-Ni-P system remains tractable in comparison to other BMGs that often contain five or more elements. This system has a critical cooling rate lower than 1 K/s and is one of the simplest prototypes of a BMG. However, binary alloys of transition metals (e.g. Pd, Ni, Cu) with metalloids (P, Si, etc.) will not form BMGs even though they can be forced to retain a glassy structure with rapid quenching from the liquid phase.

Relationship between melting enthalpy ΔHm and critical cooling rate Rc for bulk metallic glasses

2007 ◽  
Vol 457 (1-2) ◽  
pp. 6-12 ◽  
Author(s):  
An-Hui Cai ◽  
Hua Chen ◽  
Wei-Ke An ◽  
Jing-Ying Tan ◽  
Yong Zhou
Keyword(s):  
Cooling Rate ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Melting Enthalpy ◽  
Critical Cooling Rate

Critical Cooling Rate and Thermal Stability in Zr-Ti-Cu-Ni-Be Bulk Metallic Glasses

2000 ◽  
Vol 644 ◽  
Author(s):  
Theodore A. Waniuk ◽  
Jan Schroers ◽  
William L. Johnson
Keyword(s):  
Thermal Stability ◽  
Cooling Rate ◽  
Metallic Glasses ◽  
Glass Forming Ability ◽  
Liquid Region ◽  
Continuous Increase ◽  
Critical Cooling Rate ◽  
Glass Forming ◽  
The Relationship ◽  
Tie Line

AbstractThe crystallization behavior of a series of alloys in the Zr-Ti-Cu-Ni-Be system is studied. Upon cooling from the molten state with different rates, alloys with compositions ranging along a tie line from (Zr75Ti25)55(Ni45Cu55)22.5Be22.5 (Vit1) to (Zr85Ti15)55(Ni57Cu43)17.5Be27.5 (Vit4) show a continuous increase in the critical cooling rate to suppress crystallization. In contrast, thermal analysis of the same alloys shows that the undercooled liquid region, the temperature difference between the glass transition temperature and the crystallization temperature, is largest for compositions midway between the two endpoints, revealing that glass forming ability does not correlate with thermal stability. The relationship between the change in glass forming ability and thermal stability is discussed with reference to a chemical decomposition process.

scholarly journals The Effect of Cooling Rate on Microstructure and Mechanical Properties of Zr-Based Bulk Metallic Glasses

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Weihong Fu ◽  
Yajuan Sun ◽  
Wei Zhang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Metallic Glasses ◽  
Bulk Metallic Glasses ◽  
Alloy Sample ◽  
Cooling Rates ◽  
Glass Forming ◽  
Microstructure And Mechanical Properties

The aim of the present study is to shed some insights on the effect of cooling rate on the microstructure and mechanical properties for glass-forming alloys. A crystalline gradient was observed in the microstructure of 12 mm diameter Zr51Al9.96Ni14.34Cu24.9(Zr51) alloy sample from the edge to center due to uneven cooling rates. Microhardness results indicate that the lower the cooling rate, the higher the hardness for the studied alloy.

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.

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
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