“Soft” bulk metallic glasses based on cerium

Zhang, B.; Pan, M. X.; Zhao, Dongdong; Wang, W. H.

doi:10.1063/1.1768308

Cited by 112 publications

(82 citation statements)

References 19 publications

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“…The CSM is based on the concept of inherent states (IS) and potential energy landscapes (PEL) developed by Stillinger et al [8,9], Wales et al [10,11], and Milandro and Lacks [12]. Table I shows measured density, ambient T elastic constants Y, G, B, (Poisson's ratio), yield strength in compression, y , elastic strain limit ( Y =Y), and glass transition temperature, T g , for 30 metallic glasses [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Note that Y =Y varies over the range 0:014 < " Y < 0:022.…”

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confidence: 99%

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

2005

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Room temperature (T R ) elastic constants and compressive yield strengths of 30 metallic glasses reveal an average shear limit C 0:0267 0:0020, where Y C G is the maximum resolved shear stress at yielding, and G the shear modulus. The C values for individual glasses are correlated with t T R =T g , and C for a single glass follows the same correlation (vs t T=T g For a dislocation free crystal, Frenkel [1] calculated the theoretical shear strength by assuming cooperative shearing obtaining Y G=5. The yield strength of metallic glasses is thought to be determined by the cooperative shear motion of atomic clusters termed shear transformation zones (STZ's) [2 -5]. Compressive strengths of Y 0:02Y are observed with a weak dependence on normal stress or pressure [6,7]. Here, we report elastic constants and compressive yield stresses for 30 metallic glasses. Yielding at T R can be described by a critical shear strain C 0:0267 0:0020; a better description of C includes a dependence on the dimensionless temperature t T=T g . A cooperative shear model (CSM) is introduced that predicts a temperature dependent C (or C

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A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

2005

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“…19) In addition, the ÁT x is also an importent parameter that interprets GFA of bulk glassy alloys. 20) Recently, the Ln-based bulk glassy alloys have gained considerable interest again because the glassy alloys have lower T g , 21) large ÁT x , 21) high GFA, [22][23][24] low melting temperature, 25) good mechanical properties, 24,26) and hard magnetic properties. 22) It is important for scientific and engineering aspects to develop a new Ln-based glassy alloy with higher GFA and larger ÁT x .…”

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confidence: 99%

Formation and Properties of New La-Based Bulk Glassy Alloys with Diameters up to Centimeter Order

2007

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New La-based bulk glassy alloys with superior glass-forming ability (GFA) were synthesized in La-Al-Ag-(Cu,Co,Ni) system. The addition of 5 at%Ag to La-Al-Cu ternary base system greatly increases the stability of supercooled liquid as well as the GFA. The largest supercooled liquid region and largest diameter in La-Al-Cu-Ag quaternary system were of 83 K and 6.0 mm, respectively, for La 62:5 Cu 20 -Al 12:5 Ag 5 alloy. The addition of Ni or Co to La-Al-Cu-Ag alloy is effective for the further increase in GFA. The maximum sample diameter of over 12 mm was fabricated for La 62:5 Al 12:5 Cu 10 Ni 5 Co 5 Ag 5 alloy. The GFA has better correlation with reduced glass transition temperature. The new La-based bulk glassy alloys exhibit high fracture strength of 640-858 MPa with distinct plastic strains of 0.2-0.4%.

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“…15,16) More recently, Ce-based BMGs with lower glass transition temperatures have been formed. 17,18) So low T g means that Ce-based bulk metallic glasses soften even if these samples are put into boiling water. It suggests that Ce-based BMGs are appropriate materials of micromachines for fabricating various nanodevices.…”

Section: Introductionmentioning

confidence: 99%

Ce–Cu–Fe–Al–Si Bulk Metallic Glass Alloys With High Glass Forming Ability

Bian

Inoue

2005

Mater. Trans.

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New Ce-Cu-Fe-Al-Si bulk metallic glasses (BMGs) with high glass formation ability (GFA) and large supercooled liquid regions (ÁT x , ÁT x ¼ T x {T g ) were developed. Investigation shows that the addition of Fe and Si elements is very effective to improve the glass formation ability of Ce-based BMGs. For an optimizing composition, the ÁT x value is 95 K and the alloy can be prepared into bulk metallic glass rods with the diameters of at least 10 mm. In the Ce-Cu-Al-Fe alloys, the glass transition temperature (T g ), crystallization temperature (T x ) and ÁT x increase with increasing Fe content. The reduced glass transition temperature (T rg ¼ T g =T l ) of the present BMG system is about 0.5-0.6 and is much lower than that of other metal base BMG systems with high GFA. Compressive fracture strength (' f ) and Young's modulus (E) of the CeCu-Al-Fe BMGs are $930 MPa and $45 GPa, respectively, and increase with increasing Fe content.

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“Soft” bulk metallic glasses based on cerium

Cited by 112 publications

References 19 publications

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

Formation and Properties of New La-Based Bulk Glassy Alloys with Diameters up to Centimeter Order

Ce–Cu–Fe–Al–Si Bulk Metallic Glass Alloys With High Glass Forming Ability

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“Soft” bulk metallic glasses based on cerium

Cited by 112 publications

References 19 publications

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

A Universal Criterion for Plastic Yielding of Metallic Glasses with a(T/Tg)2/3Temperature Dependence

Formation and Properties of New La-Based Bulk Glassy Alloys with Diameters up to Centimeter Order

Ce&ndash;Cu&ndash;Fe&ndash;Al&ndash;Si Bulk Metallic Glass Alloys With High Glass Forming Ability

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Ce–Cu–Fe–Al–Si Bulk Metallic Glass Alloys With High Glass Forming Ability