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Title: A scheme to design multi-component bulk metallic glasses in ideal glass-forming liquids

Abstract

In this study, we have proposed to use binary eutectics, rather than individual constituent elements, as basic units for designing complex multi-component bulk metallic glasses (BMGs), based on a novel physical concept of 'ideal' glass-forming liquids. An innovative approach to designing multi-component BMGs in these ideal liquids was thus established and the reliability and usefulness of the current approach of this strategy has been confirmed in the Zr-Fe-Cu-Al metallic systems. As a result, several new BMGs with superior GFA in this system were successfully developed.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1028145
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: The Fifth International Bulk Metallic Glasses Conference, Awaji, Japan, 20061001, 20061005
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DESIGN; EUTECTICS; METALLIC GLASSES; MIXING HEAT; RELIABILITY

Citation Formats

Lu, Zhao Ping, and Liu, Chain T. A scheme to design multi-component bulk metallic glasses in ideal glass-forming liquids. United States: N. p., 2007. Web.
Lu, Zhao Ping, & Liu, Chain T. A scheme to design multi-component bulk metallic glasses in ideal glass-forming liquids. United States.
Lu, Zhao Ping, and Liu, Chain T. Mon . "A scheme to design multi-component bulk metallic glasses in ideal glass-forming liquids". United States. doi:.
@article{osti_1028145,
title = {A scheme to design multi-component bulk metallic glasses in ideal glass-forming liquids},
author = {Lu, Zhao Ping and Liu, Chain T},
abstractNote = {In this study, we have proposed to use binary eutectics, rather than individual constituent elements, as basic units for designing complex multi-component bulk metallic glasses (BMGs), based on a novel physical concept of 'ideal' glass-forming liquids. An innovative approach to designing multi-component BMGs in these ideal liquids was thus established and the reliability and usefulness of the current approach of this strategy has been confirmed in the Zr-Fe-Cu-Al metallic systems. As a result, several new BMGs with superior GFA in this system were successfully developed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • We study the similarity and correlations between relaxations and plastic deformation in metallic glasses (MGs) and MG-forming liquids. It is shown that the microscope plastic events, the initiation and formation of shear bands, and the mechanical yield in MGs where the atomic sites are topologically unstable induced by applied stress, can be treated as the glass to supercooled liquid state transition induced by external shear stress. On the other hand, the glass transition, the primary and secondary relaxations, plastic deformation and yield can be attributed to the free volume increase induced flow, and the flow can be modeled as themore » activated hopping between the inherent states in the potential energy landscape. We then propose an extended elastic model to describe the flow based on the energy landscape theory. That is, the flow activation energy density is linear proportional to the instantaneous elastic moduli, and the activation energy density {rho}{sub E} is determined to be a simple expression of {rho}{sub E}=(10/11)G+(1/11)K. The model indicates that both shear and bulk moduli are critical parameters accounting for both the homogeneous and inhomogeneous flows in MGs and MG-forming liquids. The elastic model is experimentally certified. We show that the elastic perspectives offers a simple scenario for the flow in MGs and MG-forming liquids and are suggestive for understanding the glass transition, plastic deformation, and nature and characteristics of MGs.« less
  • No abstract prepared.
  • The {gamma} parameter proposed by the authors has prompted a lot of new interests in quantifying glass-forming ability (GFA) of bulk metallic glasses (BMGs). As a result, many different GFA indicators/criteria have been suggested lately. Recent development in this area is summarized herein; it was found that all newly developed parameters can be grouped into three basic categories according to their definitions. Our statistical analysis, particularly the direct comparison with the {sigma} parameter developed by Park et al., shows that the universal GFA indicator ? is still the best in terms of reliability and applicability. In addition, limitations of allmore » the GFA parameters will be discussed, and future focuses in quantifying GFA of metallic systems will also be suggested.« less
  • Due to their scientific significance and potential engineering applications, bulk metallic glasses are among the most intensively studied advanced materials. Understanding the glass-forming ability (GFA) of these metallic alloys is a long-standing subject. While a large number of empirical factors have been proposed to correlate with GFA of the alloys, a full understanding of GFA remains a goal to achieve. Since glass formation is a competing process against crystallization, we have performed a systematic analysis on the crystallization kinetics of two known best metallic glass-formers Pd{sub 40}Cu{sub 30}Ni{sub 10}P{sub 20} (in at. %) and Zr{sub 41.2}Ti{sub 13.8}Cu{sub 12.5}Ni{sub 10}Be{sub 22.5}more » based on classical nucleation and growth theory. Our results show that there is a dramatic difference between the two alloys in their nucleation behavior although they possess comparable GFA. Particularly, an extremely sharp nucleation peak ({approx}10{sup 18}/m{sup 3} s) is found for Pd{sub 40}Cu{sub 30}Ni{sub 10}P{sub 20} around 632 K with a very small half maximum width of 42 K, implying that this alloy is an excellent candidate for nanocrystallization studies. Moreover, we have also found that the GFA of these alloys can be calculated to a high accuracy and precision based on the classical theory, suggesting that the classical theory may be sufficient to account for glass formation mechanism in these metallic alloys.« less
  • Despite its importance, a thermodynamic approach to determining the glass-forming ability (GFA) of bulk metallic glass (BMG) remains a goal to be achieved. We examined the GFA of water-quenched Pd-P-based and Pt{sub 60}Ni{sub 15}P{sub 25} BMG's in which their molten alloys were sufficiently treated with a dehydrated B{sub 2}O{sub 3} flux prior to and during quenching to room temperature. This allowed us to envisage the applicability of the classical steady-state homogeneous nucleation theory because the suppression of heterogeneous nucleation worked effectively. GFA was examined by comparing the critical cooling rate R{sub c}{sup h} for glass formation with the maximum diametermore » d{sub max} of glass. To calculate R{sub c}{sup h}, the homogeneous nucleation rate I{sub ss}(T), and the growth rate u{sub c}(T) were estimated as functions of the undercooling temperature of molten alloys. Then, the free energy difference {Delta}G{sub L-x}(T) between the liquid and crystalline phases, and the viscosity {eta}(T) of the liquid were experimentally determined while the surface energy {sigma}{sub sL}(T) at the liquid-nucleus interface was estimated by calculation. The d{sub max} of rod BMG's correlated strongly to R{sub c}{sup h} through the relation R{sub c}{sup h} {approx_equal}d{sub max}{sup -3}/10 mm{sup 3} Ks{sup -1}.« less