Glass formability, thermal stability and mechanical properties of La-based bulk metallic glasses

Jiang, Qinghong; Zhang, G.Q.; Chen, Lianyi; Jia, Wu; Zhang, H.G.; Jiang, J.Z.

doi:10.1016/j.jallcom.2006.07.109

Cited by 48 publications

(26 citation statements)

References 23 publications

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“…Many cerium-bearing alloys are heavy-fermion compounds and have anomalous low-temperature resistivity and magnetization behaviors that are relevant to Kondo coupling (25,26) and also have first-order phase transitions resembling the ␥ N ␣ phase transition for pure cerium or second-order phase transitions above a critical point (27). Recently, a LaCe-based BMG with a maximum size up to 10 mm (28) and a La-based BMG with a maximum size up to 20 mm were developed (29). An interesting question has been raised: Do LaCe-based BMGs have electronic phase transitions similar to pure cerium and its crystalline alloys?…”

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confidence: 99%

Anomalous compression behavior in lanthanum/cerium-based metallic glass under high pressure

Zeng

Feng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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In situ high-pressure x-ray diffraction, low-temperature resistivity, and magnetization experiments were performed on a La 32Ce32Al16Ni5Cu15 bulk metallic glass (BMG). A sudden change in compressibility at Ϸ14 GPa and a rapid increase of resistivity at Ϸ12 K were detected, whereas magnetic phase transformation and magnetic field dependence of the low-temperature resistivity do not occur at temperatures down to 4.2 K. An interaction between conduction electrons and the two-level systems is suggested to explain the temperature and field dependences of resistivity of the BMG alloy. Although the cause of the unusual change in compressibility at Ϸ14 GPa is not clear, we believe that it could be linked with the unique electron structure of cerium in the amorphous matrix. An electronic phase transition in BMG alloys, most likely a second-order amorphous-to-amorphous phase transition, is suggested.bulk metallic glass ͉ phase transition R ecent studies of amorphous materials have revealed that more than one distinct amorphous phase can be formed from the same substance, a phenomenon that is called amorphous polymorphism (1-4). The nature of amorphous-toamorphous transition induced by pressure has been a topic of considerable research activity in several substances, e.g., ice, silicon, silica, and carbon (5-13). All these reports have encouraged the search for polymorphic phase transitions in liquids and glasses (14-19). Bulk metallic glasses (BMGs) as a new kind of amorphous material with a maximum size up to Ϸ70 mm in diameter and wide supercooled liquid regions have been fabricated in the last decade (20,21). To the best of our knowledge, evidence for an amorphous-to-amorphous phase transition has rarely been reported in metallic glasses. Very recently, parallel to our work, Sheng et al. (22) reported similar amorphous-toamorphous phase transition in a binary CeAl metallic glass ribbon sample.For decades, both structural and electronic transitions in pure elemental cerium and its crystalline alloys have been intensively investigated. Cerium, which is the first element in the lanthanide series with one 4f electron, has a complex phase diagram. Depending on pressure and temperature, it can be either a paramagnet, an antiferromagnet, or a superconductor. Cerium is also the only pure element to exhibit a solid-solid critical point in the well known ␥ N ␣ isostructural phase transition (23, 24). Many cerium-bearing alloys are heavy-fermion compounds and have anomalous low-temperature resistivity and magnetization behaviors that are relevant to Kondo coupling (25, 26) and also have first-order phase transitions resembling the ␥ N ␣ phase transition for pure cerium or second-order phase transitions above a critical point (27). Recently, a LaCe-based BMG with a maximum size up to 10 mm (28) and a La-based BMG with a maximum size up to 20 mm were developed (29). An interesting question has been raised: Do LaCe-based BMGs have electronic phase transitions similar to pure cerium and its crystalline alloys?In this work, we report...

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mentioning

confidence: 99%

Anomalous compression behavior in lanthanum/cerium-based metallic glass under high pressure

Zeng

Feng

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

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“…There are three reasons to select this alloy: (1) it exhibits excellent GFA, which can be cast into amorphous rods with a diameter of 35 mm; (2) it has a low glass-transition temperature of 430 K and low melting temperature of about 640 K; and (3) it provides an excellent prototype to investigate the glass transition behavior and liquid properties of BMGs. [5,15] alloys show a slight decrease with temperature. For the three alloys, the volume expansion coefficient and the slopes of radii variation for the first to third nearest neighboring coordination shells show differences at glassy-to-supercooled liquid transition, while no obvious changes were detected at the supercooled liquid-to-liquid transition for three alloys.…”

Section: Qk Jiang Zy Chang Xd Wang and Jz Jiangmentioning

confidence: 95%

Structures at Glassy, Supercooled Liquid, and Liquid States in La-Based Bulk Metallic Glasses

Jiang

Chang

Wang

et al. 2009

Metall Mater Trans A

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Local atomic structures at glassy, supercooled liquid, and liquid states for La-based bulk metallic glasses (BMGs) have been investigated by in-situ high-temperature X-ray diffraction. It is found that the coordination number of about 15.1 ± 0.1 for the La 62 Al 14 Cu 11.7 Ag 2.3 Ni 5 Co 5 alloy does not depend on temperature up to liquid temperature, while it decreases slightly with temperature for the La 62 Al 14 Cu 24 and La 62 Al 14 Cu 20 Ag 4 alloys. The S(q) data recorded at the supercooled liquid region can be well described by the Debye theory. For the three alloys, the volume expansion coefficient and the slopes of radii variation for the first to third nearest neighboring coordination shells show differences at glassy-to-supercooled liquid transition, while no obvious changes were detected at supercooled liquid-to-liquid transition for them. The linear expansion coefficient value (b = 1.6 ± 0.1 9 10 -5 K -1 ) below the glass transition temperature deduced from S(q) data is consistent with that detected by the dilatometer (b = 1.25 9 10 -5 K -1 ) for the La 62

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“…As an important branch of the industrial system, metallic glass have been commercialized in several fields such as engineering, medicine, electronics, military, sports, and jewelry making for a period of time [6][7][8][9][10] . A variety of bulk glassy alloys have been developed in lanthanide (Ln)- [11] , Mg- [12] , Zr- [13,14] , Be- [15] , Fe- [16] , Pd-Cu- [17] , Ti- [18] , Ni- [19] , Co- [16] and Cu- [20] based the systems by various slow cooling producing processes such as copper mold casting and water quenching etc. Among these bulk metallic glass systems, Zr-based alloy systems are the most important alloy systems because it conjuncts the achievement of various useful engineering properties with high glass-forming ability.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Zr-based Bulk Metallic Glass During Continuous Casting Solidification Process

Zhou

Jia

et al. 2015

Mat. Res.

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Glass formability, thermal stability and mechanical properties of La-based bulk metallic glasses

Cited by 48 publications

References 23 publications

Anomalous compression behavior in lanthanum/cerium-based metallic glass under high pressure

Anomalous compression behavior in lanthanum/cerium-based metallic glass under high pressure

Structures at Glassy, Supercooled Liquid, and Liquid States in La-Based Bulk Metallic Glasses

Numerical Simulation of Zr-based Bulk Metallic Glass During Continuous Casting Solidification Process

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