A new criterion for predicting the glass-forming ability of bulk metallic glasses

Long, Zhilin; Hongqin, Wei; Ding, Y.; Zhang, Ping; Xie, Guoqiang; Inoue, Akihisa

doi:10.1016/j.jallcom.2008.07.087

Cited by 124 publications

(63 citation statements)

References 48 publications

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“…[1][2][3][4][5][6][7][8][9][10] For example, Zr-, Pd-, Ln-, and Mg-based BMGs have R C values below~100°C/s and, hence, are considered as having high GFA. [1][2][3][4][5][6][7][8] Over the past 40 years, numerous parameters have been proposed for predicting the ease of glass formation and glass stability in these materials, with examples including the following: the reduced glass-transition temperature or Turnbull's principle T rg = T g /T l ; [11,12] the supercooled liquid interval DT X = T X À T g ; [6] c = T X /(T g + T l ); [13] c m = (2T X À T g )/T l ; [14] DT rg = (T X À T g )/(T l À T g ); [15] d = T X /(T l À T g ); [16] u = T rg (DT X /T g ) 0.143 ; [17] a = T X /T l ; [18] b = T X /T g + T g /T l ; [18] b I = T X 9 T g /(T l À T X ) 2 ; [19] and more recently x = T g /T X À 2T g /(T g + T l ), [20] where T X and T l are the onset crystallization temperature and liquidus temperature, respectively. In general, there is no single parameter that accurately correlates GFA to a specific parameter in all alloy systems, with trends often corresponding well in some systems but not as well in others.…”

Section: Introductionmentioning

confidence: 99%

“…[20,21] With reference to the aforementioned glassforming parameters, it can be seen that they explicitly relate T g , T X , and T l (determined by heating rather than cooling) with the GFA, R C , and critical casting thickness Z C . [6,[11][12][13][14][15][16][17][18][19][20] Further, the former are known to vary marginally with the heating rate, depending on the fragility of the individual glass, whereby a faster heating rate yields higher values of T g and T X [22,23] and increases the size of DT X . [22] Hence, from a physical metallurgy perspective, the only quantitative measure of GFA is the critical cooling rate, despite the difficulties in determining this parameter.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Casting Parameters on the Critical Casting Size of Bulk Metallic Glass

Laws

Gun

Ferry

2009

Metall Mater Trans A

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The effect of various casting parameters and thermophysical properties of bulk metallic glasses (BMGs) on critical section size, defined as the maximum casting size that generates a throughsection amorphous alloy, has been analyzed using a simple heat-transfer model. It was found that the interfacial heat transfer between the mold and the casting has a strong influence on the critical section thickness of a BMG. It is argued herein that the critical cooling rate rather than the critical casting size is a more robust indicator of glass-forming ability (GFA). Further, with respect to the critical cooling rate and heat-transfer effects during casting, a distinct difference was found between the critical casting thickness in rectangular-shaped castings and the critical casting diameter in rod-shaped castings, and a relationship was derived for relating these parameters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Casting Parameters on the Critical Casting Size of Bulk Metallic Glass

Laws

Gun

Ferry

2009

Metall Mater Trans A

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“…Finally, for bulk samples it has been shown that the  parameter exhibits the strongest interrelationship with the critical radius of the bulk sample when compared to other criteria reported so far [20]. All these parameters are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 75%

Glass-formation and corrosion properties of Fe–Cr–Mo–C–B glassy ribbons with low Cr content

Madinehei

Bruna

Duarte

et al. 2014

Journal of Alloys and Compounds

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The effect of low amounts of Cr on glass forming ability and corrosion behavior of Fe (65-x) Cr x Mo 14 C 15 B 6 (x=0, 2, 4, 6, 8, 10 at.%) ribbons have been studied. It was found that the reduced glass transition temperature (T rg ) do not change significantly with Cr content. The glass forming ability (GFA) of this system is evaluated by the  m ,  and  parameters and the alloys containing 4 and 6 at.% were found to be the best glass formers in this system. The temperature interval of the supercooled liquid region (∆T x ) changed with Cr and was enlarged from 35 K at x=0 to 50 K at x=4. Corrosion rates measured by immersion tests in H 2 SO 4 decreased with an increase of chromium content in the alloys. The electrochemical measurements indicate that the alloys containing more than 4 at.% of Cr are spontaneously passivated with low current densities in 0.1 N H 2 SO 4 whereas the alloys with Cr content < 4 at.% showed active behavior. In view of these results, the optimal amount of Cr addition in Fe-Mo-C-B amorphous steels is discussed.

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“…New BMG alloy development has relied heavily on experimental exploration, and the attempts to correlate glass-forming tendency with fundamental thermodynamic properties have not led to a predictive ability in any general sense. [4][5][6][7] As a complement to the experiment, computational methods may offer powerful avenues for studying glass formation and other properties of glass-forming alloys. [8] Indeed, both classical and ab initio molecular dynamics (MD) methods have provided substantial fundamental gains related to the structural aspects of the glass transition along with insights into the influence of alloy chemistry on the glass-forming tendency in several alloy systems (e.g., Al-Mg, [9] Cu-Zr, [1,10] Ni-Zr, [11,12] Ag-Ni-Zr, [13] and Ca-Mg-Zn [14] ).…”

Section: Tao Wang and Ralph E Napolitanomentioning

confidence: 99%

A Phase-Field Model for Phase Transformations in Glass-Forming Alloys

Wang

Napolitano

2012

Metall Mater Trans A

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A phase-field model is proposed for phase transformations in glass-forming alloys. The glass transition is introduced as a structural relaxation, and the competition between the glass and crystalline phases is investigated. The simulations are performed for Cu-Zr alloys, employing thermodynamic and kinetic parameters derived from reported thermodynamic modeling and molecular dynamics simulation results, [1][2][3] respectively. Four distinct phase fields are treated with a multi-phase-field approach, representing the liquid/glass, Cu 10 Zr 7 , CuZr, and CuZr 2 phases. In addition, a continuum-field method is applied to the liquid to accommodate the liquid-glass transformation. The combined phase-field approach is used to investigate the glass formation tendency, and critical cooling rates are estimated and compared with the reported experimental values. A phase-field model is proposed for phase transformations in glass-forming alloys. The glass transition is introduced as a structural relaxation, and the competition between the glass and crystalline phases is investigated. The simulations are performed for Cu-Zr alloys, employing thermodynamic and kinetic parameters derived from reported thermodynamic modeling and molecular dynamics simulation results, [1][2][3] respectively. Four distinct phase fields are treated with a multi-phase-field approach, representing the liquid/glass, Cu 10 Zr 7 , CuZr, and CuZr 2 phases. In addition, a continuum-field method is applied to the liquid to accommodate the liquid-glass transformation. The combined phase-field approach is used to investigate the glass formation tendency, and critical cooling rates are estimated and compared with the reported experimental values. Keywords Ames Laboratory Disciplines Ceramic Materials Comments This article is from Metallurgical and Materials Transactions

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A new criterion for predicting the glass-forming ability of bulk metallic glasses

Cited by 124 publications

References 48 publications

Influence of Casting Parameters on the Critical Casting Size of Bulk Metallic Glass

Influence of Casting Parameters on the Critical Casting Size of Bulk Metallic Glass

Glass-formation and corrosion properties of Fe–Cr–Mo–C–B glassy ribbons with low Cr content

A Phase-Field Model for Phase Transformations in Glass-Forming Alloys

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