A study of the glass forming ability in ZrNiAl alloys

Qin, Jing; Zhang, Yong; Wang, D.; Li, Y.

doi:10.1016/j.msea.2006.08.109

Cited by 30 publications

(20 citation statements)

References 23 publications

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“…The data were taken from the literature [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] and are given in Table 1. For better reproducibility only data for ternary glassy alloys are used.…”

Section: Resultsmentioning

confidence: 99%

“…This value determines the amount [39] Cu-Zr-Ti 60 30 10 713 750 1153 37 0.618 0.402 4 0.60 [40] Gd-Al-Co 60 25 15 586 638 52 3 0.48 [41] Gd-Al-Ni 60 25 [41] Gd-Al-Ni 60 30 10 596 638 42 2.5 0.40 [41] Gd-Al-Ni 55 25 20 598 650 52 2.5 0.40 [42] Gd-Co-Al 60 30 10 565 605 40 2 0.30 [41] Gd-Co-Al 60 25 15 572 617 952 45 0.601 0.405 5 0.70 [41] Gd-Co-Al 60 20 20 580 625 45 2.5 0.40 [41] Gd-Ni-Al 60 20 20 587 621 34 2 0.30 [41] Gd-Ni-Al 50 25 25 598 645 47 2 0.30 [42] La-Al-Cu 55 25 [43] Pd- Ni-P 40 40 20 575 640 905 65 0.635 0.432 10 1.00 [43] Pd-Ni-P 40 40 20 0.590 3 0.48 [47] Pd-Si-Cu 78 16 6 0.630 3 0.48 [47] Pt-Ni-P 48 32 20 0.600 3 0.48 [47] Zr-Cu-Al 53. [49] Zr-Ni-Al 60 25 15 77 5 0.70 [50] Zr-Ni-Al 55 25 20 760 810 50 5 0.70 [51] Zr-Ni-Al 65 25 10 682 722 1253 40 0.544 0.373 5 0.70 [52] Zr-Ni-Al 63 25 [52] of heat released and transferred to the mould on cooling of a molten metal per unit volume of an ingot. k l and C p q differ within one order of magnitude (in general 2-3 times) between different molten metals.…”

Section: Resultsmentioning

confidence: 99%

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Intrinsic and Extrinsic Factors Influencing the Glass‐Forming Ability of Alloys

2008

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Bulk glassy alloys (also called bulk metallic glasses, BMGs) currently attract significant attention in the field of materials science. Research on glassy alloys started after the formation of the first Au-Si sample with an amorphous structure in 1960 [1] at a very high cooling rate of 10 6 K/s. The formation of a glassy (amorphous) phase from a melt takes place through the glass-transition phenomenon. [2,3] Metallic glasses are metastable at room temperature and devitrify/crystallize on heating [4,5] above the crystallization temperature T x (b) (b is the heating or cooling rate) for kinetic reasons. [6] A large number of BMGs, defined as 3-dimentional massive glassy articles with a size not less than 1 mm in any dimension, have been produced during the last decade. [7][8][9] BMGs can be obtained at cooling rates of the order of 100, 10, 1 K/s and even less. [10,11] The largest number of metallic glass applications takes advantage of their exceptional and highly tailorable magnetic properties. [12] Bulk glassy alloys exhibit not only high strength, hardness, wear resistance and large elastic deformation, but high corrosion resistance as well. Moreover, the fatigue-endurance limits of Zr-based alloys are comparable with those of high-strength structural alloys. [13] Pt-based [14] and Zr-based [15] bulk metallic glasses were recently reported to exhibit high room-temperature plasticity. Although some explanations have been given, [16,17] the mechanism of plasticity is not fully established.The combination of exceptional structural and functional properties and the ability to produce bulk product forms has led to a significant number of important applications. However, further discovery, development and application of metallic glasses is limited by an understanding of the fundamental features that control glass-forming ability (GFA) and thermal stability. Bulk glassy alloys possess three common features summarized by Inoue, [4,6] i.e., belong to multicomponent systems with 3 or more constituents, have significant mismatch in atomic radii of greater than 12 %, and exhibit large, negative mixing enthalpies (DH) among the constituent elements. A large number of physical-mathematical parameters (determining characteristics) and factors (features contributing to a particular result) have been proposed so far to indicate the GFA of BMGs. These include a number of derived thermal parameters that depend on the glass transition temperature (T g ), the crystallization temperature (T x ) and the liquidus temperature (T l ). [18] Other factors include compositional proximity to a deep eutectic trough [19] and particular distributions in atomic sizes. [20]. However, none of these guidelines have been established to be sufficiently robust and predictive to be considered as necessary and sufficient for bulk glass formation.In the present paper we consider solidification of a metallic liquid phase by casting and will discuss kinetic, [21,22] thermodynamic, processing and other factors [23,24] as well as semi-empirical parameters ...

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Intrinsic and Extrinsic Factors Influencing the Glass‐Forming Ability of Alloys

2008

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“…A rationalization of the glass-forming abilities (GFAs) of Al-TM-Zr alloys is desirable to quantify complex BMG compositions. Disagreements exist with regard to experimental accounts of the GFA for fundamental ternary systems [9][10][11]. This study is devoted to a reexamination of the GFAs of Al-Ni-Zr alloys.…”

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confidence: 99%

Revisiting Al-Ni-Zr bulk metallic glasses using the ‘cluster-resonance’ model

Qiang

Wang

et al. 2011

Chin. Sci. Bull.

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(x=1, 1.5, 2, 3) were designed in this work and the bulk metallic glass (BMG) formation of these compositions was investigated by copper mold suction casting. A centimeter-scale BMG sample was obtained for the Ni 4 Zr 9 Al 2 (Al 13.3 Ni 26.7 Zr 60 in atomic percent) composition. The thermal glass parameters for this BMG were determined to be ΔT x = 68 K, T rg = 0.579, and γ m = 0.689. Using the 'cluster-resonance' model for glass formation an optimal BMG composition was determined using the cluster formula [Ni 3 Zr 9 ](Al 2 Ni 1 ). . These complex alloys are based on the basic ternary systems of Al-TM-Zr (TM = Ni, Co, Cu) together with specific alloying substitutes [5,7,8]. A rationalization of the glass-forming abilities (GFAs) of Al-TM-Zr alloys is desirable to quantify complex BMG compositions. Disagreements exist with regard to experimental accounts of the GFA for fundamental ternary systems [9][10][11]. This study is devoted to a reexamination of the GFAs of Al-Ni-Zr alloys. We first use the 'cluster-plus-glue-atom' model [12,13] for BMG composition design. This model presents a semiphenomenological treatment of a BMG structure. An atomic cluster of specific topology, chemical composition and glue structure were used to establish the statistical composition of a BMG system. An ideal BMG assumes universal cluster formulae such as [cluster] 1 (glue atoms) x , with x=1 or 3 [13,14]. To determine the structural stability of the model structure we recently proposed a 'cluster-resonance' model by taking the coupling of long-range Friedel oscillations of valence electrons with the pair correlation function into consideration [15]. The composition design of Al-Ni-Zr BMG alloys is incorporated into the model that follows. The 'cluster-resonance' model and composition designAccording to Häussler et al. [16] the static atomic structure of an ideal amorphous state is in resonance with the longrange Friedel oscillations of valence electrons. The resonance results in spherical periodicity as shown by the peak (shell) oscillation with a certain period in the pair correlation function of an ideal amorphous state. The spherical periodicity gives an oscillation wavelength ( Fr ) in the form of

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“…[1][2][3][4] In most cases, the systems with much enhanced glass-forming ability (GFA) are multicomponent alloys that must be compositionally based on simple base systems with at least modest GFA for BMG formation. Many examples of base systems are ternary ones, including PdÀNiÀP, 5,6 LaÀNiÀAl, 7 ZrÀCu/NiÀAl, [8][9][10][11] ZrÀTiÀBe, 12 MgÀCuÀRE (RE = Y, Gd), [13][14][15][16] FeÀNb/ YÀB, 17,18 and NiÀNbÀSn. 19,20 As a mater of fact, nearly all of the high-order BMG-forming alloys can be broadly described as pseudo-ternary either chemically or topologically.…”

Section: Introductionmentioning

confidence: 99%

“…It implies that its critical cooling rate for glass formation (less than 10 K/s) is at least an order of magnitude lower than that of CuÀHf binary glass former. Meanwhile, the GFA of Cu 49 Hf 42 Al 9 seems to be one of the strongest among the already-discovered ternary Cu/Zr-based alloys including CuÀZrÀAl, 10 ZrÀNiÀAl, 11 CuÀZrÀTi, [31][32][33] CuÀHfÀTi, 31 and CuÀZrÀAg. 34 Consequently, to understand the origin of the GFA improvement from the base binary CuÀHf to the ternary CuÀHfÀAl, it is useful to conduct a systematic comparison of the relevant eutectic reactions, solidification pathways of the melt, and fragility/strength of the liquid.…”

Section: Introductionmentioning

confidence: 99%

Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys

Jia

2009

J. Mater. Res.

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Optimized compositions for bulk metallic glass (BMG) formation have been determined for the CuÀHf binary and CuÀHfÀAl ternary systems. The CuÀHfÀAl BMG-forming composition region is identified to correlate with the (L ! Cu 10 Hf 7 + CuHf 2 + CuHfAl) eutectic reaction. The eutectic temperature is reduced by nearly 50 K relative to that of the binary eutectic, demonstrating the significant role of the third element Al in stabilizing the liquid. The fragility parameter D* of the Cu 55 Hf 45 binary and Cu 49 Hf 42 Al 9 ternary supercooled liquid was determined from relaxation time measurements, indicating that Al incorporation also leads to a "stronger" liquid. The combination of these thermodynamic and kinetic effects is responsible for the dramatic enhancement of glass-forming ability from the CuÀHf binary to the CuÀHfÀAl ternary.

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A study of the glass forming ability in ZrNiAl alloys

Cited by 30 publications

References 23 publications

Intrinsic and Extrinsic Factors Influencing the Glass‐Forming Ability of Alloys

Intrinsic and Extrinsic Factors Influencing the Glass‐Forming Ability of Alloys

Revisiting Al-Ni-Zr bulk metallic glasses using the ‘cluster-resonance’ model

Comparison of bulk metallic glass formation between Cu-Hf binary and Cu-Hf-Al ternary alloys

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