Influence of casting temperature on the thermal stability of Zr-based metallic glasses

Mao, Jie; Zhang, H.F.; Fu, Huameng; Wang, A.M.; Li, H.; Hu, Zhonglue

doi:10.1016/j.jallcom.2010.02.122

Cited by 10 publications

(7 citation statements)

References 32 publications

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“…However, the trend of these changes is often inconsistent in reported investigations. For example, in some investigations overheating the molten alloy to a high quenching temperature could lead to higher glass transition temperature T g and crystallization temperature T x of the obtained MGs, [14,[16][17][18][21][22][23][24][25]28,47,48] while decreased T x with increasing T q was reported in other investigations when the molten alloy was overheated. [25,26] In addition, it was found that glass transition and supercooled liquid region (SLR) disappear when glass-forming alloys are overheated and quenched from high T q .…”

Section: Introductionmentioning

confidence: 70%

“…In the majority of past studies, the structural origin of property changes is generally interpreted as the gradual dissipations of local atomic clusters or the nucleation cores at high melt temperatures so that less ordered clusters are retained in MGs after quenching. [14,21,22,24,25] Nevertheless, it has been reported that the elevation of T q will lead to the increase of oxygen content in the alloy. [31,48] To understand the T q -dependence of property changes, we carefully analyzed the chemical compositions of the MG ribbons quenched from different melt temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…[1] The disordered atomic structures of MGs result in many unachievable properties with crystalline alloys, such as high strength, [2][3][4][5][6] large elastic limit, [7][8][9] and thermal-plastic formability. [10][11][12] Because the atomic structures of MGs are believed to depend on thermal history, [13] many efforts have been devoted to the investigation on the effects of melt treatment, in particular, overheating and quenching temperature, T q , on thermal stability, [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] glass formation ability (GFA), [31][32][33][34][35][36] magnetic [37][38][39][40] and mechanical properties, [27,28,[41][42][43][44] and corrosion resistance. [45,...…”

Section: Introductionmentioning

confidence: 99%

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Effect of overheating-induced minor addition on Zr-based metallic glasses

Yang 杨,

Bo 薄,

Huang 黄

et al. 2024

Chinese Phys. B

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Melt treatment is well known to have an important influence on the properties of metallic glasses (MGs). However, for the MGs quenched from different melt temperatures with a quartz tube, the underlying physical origin responsible for the variation of properties remains poorly understood. In the present work, we systematically studied the influence of melt treatment on the thermal properties of a Zr50Cu36Al14 glass-forming alloy and unveiled the microscopic origins. Specifically, we quenched the melt at different temperatures ranging from 1.1T l to 1.5T l (T l is the liquidus temperature) to obtain melt-spun MG ribbons and investigated the variation of thermal properties of the MGs upon heating. We found that glass transition temperature, T g , increases by as much as 36 K, and the supercooled liquid region disappears in the curve of differential scanning calorimetry when the melt is quenched at a high temperature up to 1.5T l . The careful chemical analyses indicate that the change in glass transition behavior originates from the incorporation of oxygen and silicon in the molten alloys. The incorporated oxygen and silicon can both enhance the atomic interactions between atoms, which renders the cooperative rearrangements of atoms difficult, and thus enhance the kinetic stability of the MGs.

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Section: Introductionmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of overheating-induced minor addition on Zr-based metallic glasses

Yang 杨,

Bo 薄,

Huang 黄

et al. 2024

Chinese Phys. B

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“…Increasing the casting temperature improved thermal stability of metallic glasses as viscosity decreased and the homogenous structure of the molten alloy formed (11). A threshold of the casting temperature was detected at which the BMG properties decrease when temperature increases.…”

Section: Casting Temperaturementioning

confidence: 94%

“…BMG casting requires a vacuum chamber to avoid inclusions and contaminants throughout cyclic heating process (11). The critical parameters in conventional metal casting tend to be focused on melting temperature, pouring temperature, and solidification temperature.…”

Section: Casting Temperaturementioning

confidence: 99%

Rapid Solidification Processing and Bulk Metallic Glass Casting

Aqida

Shah

Naher

et al. 2014

Comprehensive Materials Processing

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Dependence of GFA and Crystallization Behaviors of Al₈₆Ni₉La₅ Metallic Glass on Its Original Liquid State

Wang

Zhang

et al. 2012

Adv Eng Mater

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In recent years, much experimental and numerical evidence has been accumulated for the existence of liquid-liquid structure changes induced by temperature or pressure. [1][2][3] Lots of work have proved that the melt temperature could change glass forming ability (GFA), thermal stability, and mechanical properties of a metallic glass. [4][5][6] Recently, the liquid-liquid structure transition (LLST) has been found in Zr-based metallic glass formers by Li et al. using electrostatic levitation. They also found that the LLST influenced the crystallization behavior of the metallic glasses. [7] For Al-based alloys, the viscosity and surface tension of Al 91 La 5 Ni 4 and Al 91 Ce 5 Ni 4 melts indicated that an irreversible atomic redistribution existed in the melts. [8,9] X-ray diffraction (XRD) experiments showed that there was abrupt change in the pair correlation function g(r) of the Al 85 Ni 10 Ce 5 alloy in the range from 1270 to 1480 K. [10] It suggested that some Al-TM-RE alloys may also exhibit LLST behavior.Aluminum-based Al-TM-RE (TM-transition metals, RE-rare earth elements) amorphous alloys with high Al contents (>80 at%) exhibit high strength in combination with good ductility and corrosion, which makes them suitable for application as structural materials. [11,12] Therefore, the GFA as well as the crystallization process of the Al-based amorphous alloys has been drawn much attention. However, little attention has been paid to the influence of the LLST on the GFA and the crystallization behavior of Al-based amorphous alloys. In the present work, the variations of electrical resistivity (ER) and differential thermal analysis (DTA) as a function of temperature for the Al 86 Ni 9 La 5[13] melt were investigated by continuous heating. Based on the anomalous behavior of LLST observed in the melt, three melt temperatures were chosen to prepare the amorphous samples and then the effects of quenching temperature on the GFA and the crystallization behavior were studied. ExperimentalThe Al 86 Ni 9 La 5 alloy ingots were prepared by arc melting the mixtures of pure Al (99.999%), Ni (99.99%), and La (99.9%) metals in a titanium-gettered argon atmosphere in a watercooled copper crucible. The ingots were remelted six times to ensure compositional homogeneity and then were divided into three pieces. One of them was remelted and then suction casting into a copper mold to obtain F5 Â 50 mm 3 cylindrical rods for ER measurement. The ER against temperature was measured using the D. C. four-probe method under vacuum of about 10 À2 Pa. The continuous heating process of the alloy was measured using a DTA instrument at a heating rate of 10 K min À1 . Another ingot pieces were then ejected into a wedge-shaped copper mold with an inclined angle of 58 and 10 mm in width. According to the LLST observed by both ER and DTA measurement, three quenching temperatures were chosen to prepare wedge-shaped samples according to the temperature with the anomalous changes of ER, which were During the heating process the temperature-induced liq...

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Influence of casting temperature on the thermal stability of Zr-based metallic glasses

Cited by 10 publications

References 32 publications

Effect of overheating-induced minor addition on Zr-based metallic glasses

Effect of overheating-induced minor addition on Zr-based metallic glasses

Rapid Solidification Processing and Bulk Metallic Glass Casting

Dependence of GFA and Crystallization Behaviors of Al₈₆Ni₉La₅ Metallic Glass on Its Original Liquid State

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Influence of casting temperature on the thermal stability of Zr-based metallic glasses

Cited by 10 publications

References 32 publications

Effect of overheating-induced minor addition on Zr-based metallic glasses

Effect of overheating-induced minor addition on Zr-based metallic glasses

Rapid Solidification Processing and Bulk Metallic Glass Casting

Dependence of GFA and Crystallization Behaviors of Al86Ni9La5 Metallic Glass on Its Original Liquid State

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Dependence of GFA and Crystallization Behaviors of Al₈₆Ni₉La₅ Metallic Glass on Its Original Liquid State