Structural and magnetic nanoclusters in Cu50Zr50−xGdx (x=5at.%) metallic glasses

Mattern, N.; Shariq, A.; Schwarz, Björn; Vainio, Ulla; Eckert, J.

doi:10.1016/j.actamat.2012.01.019

Cited by 21 publications

(16 citation statements)

References 15 publications

(14 reference statements)

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“…The first transformation upon heating amorphous Cu 50 Zr 50 was most frequently reported as an exothermic event, beginning around 720 K (447°C), which was associated with complete crystallization* involving the formation of Cu 10 Zr 7 and CuZr 2 . Of the five [12,17,20,28,33] studies that shared this result in common, two [28,33] reported a second exothermic event around 773 K and 783 K (500°C and 510°C), respectively, during thermal analysis. Only one [28] of those studies reported on the phase evolution corresponding with the second exotherm, associating it with the growth (increased fraction) of CuZr 2 .…”

Section: Introductionmentioning

confidence: 69%

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Cullinan

Kalay

et al. 2014

Metall Mater Trans A

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The crystallization kinetics and microstructural dynamics associated with devitrifying a meltspun Cu 50 Zr 50 metallic glass were investigated using isothermal treatments, in situ high-energy synchrotron X-ray diffraction, conventional and high-resolution transmission electron microscopy, and differential scanning calorimetry. The analysis of isothermal transformations allows us to more clearly unravel the complex interplay between nucleation and growth of competing stable and metastable phases. The isothermal devitrification response was found to involve the Cu 10 Zr 7 , CuZr 2 , and CuZr phases, consistent with previously reported constant heating rate experiments, but here we have resolved the phase evolution and structural characteristics of the transformation, including the very early stages of crystallization. At 671 K (398°C), the isothermal transformation starts with the formation of the Cu 10 Zr 7 phase, which grows in a generally equiaxed morphology. At a size of approximately 100 nm, the growth of the Cu 10 Zr 7 particles is interrupted by the precipitation of a thin layer of the CuZr 2 phase, upon which the metastable CuZr (B2) grows epitaxially. Crystallization kinetics are quantified here though in situ measurements (HEXRD, DSC) and ex situ microstructural analysis (TEM, HRTEM). Finally, the influences of chemical partitioning, diffusion, and crystallographic orientation on this sequence are examined.

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Section: Introductionmentioning

confidence: 69%

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Cullinan

Kalay

et al. 2014

Metall Mater Trans A

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“…CueZr-based bulk metallic glasses (BMGs) have been extensively investigated due to their excellent interestingly properties including work hardening [1], martensite transformation [2e5], magnetism [6], catalytic activity [7,8], room-temperature plasticity and cryogenic temperature plasticity [9e14], which enables their applications as structural and functional materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ni substitution on glass forming ability, mechanical, electrical and thermal properties of Cu–Zr–Ti glass forming alloys

Cai

Ding

et al. 2015

Materials Chemistry and Physics

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“…For example, Mattern et al [6] found that a ferromagnetic Gd-enriched nanocluster could form in Cu 50 Zr 50−x Gd x (x=5) metallic glasses due to the phase separation by Gd minor addition. Xi et al [20] found that Gd minor addition improved the combination of the GFA and the room-temperature plasticity of Cu 46 Zr 47 Al 7 BMG.…”

Section: Introductionmentioning

confidence: 99%

“…Cu-Zr binary alloy system is characterized by good glass forming ability (GFA) and wide composition region for the formation of glass alloys [15] Element minor addition/substitution is a well-known method for improving the GFA and other properties of glass forming alloys [6,[12][13][14]19,20]. For example, Mattern et al [6] found that a ferromagnetic Gd-enriched nanocluster could form in Cu 50 Zr 50−x Gd x (x=5) metallic glasses due to the phase separation by Gd minor addition.…”

Section: Introductionmentioning

confidence: 99%

“…Cu-based bulk metallic glasses (BMGs) have been extensively investigated due to their interestingly properties including work hardening [1], martensitic transformation [2][3][4][5], magnetism [6], catalytic activity [7,8], cryogenic temperature plasticity [9] and room-temperature plasticity [10][11][12][13][14], which enable their applications as structural and functional materials.…”

Section: Introductionmentioning

confidence: 99%

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Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−x Al x (0⩽x⩽11.0) glass forming alloys

Cai

Liu

et al. 2015

Sci. China Mater.

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Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−xAlx (0x 11.0) glass forming alloys were systematically investigated. The results show that Cu50Zr47Al3 alloy has the best glass forming ability (GFA), lowest fragility index (m) and highest fracture strength. There are B2 CuZr and B19' CuZr phases for Cu50Zr50−xAlx (0x5.0) alloys. B2 CuZr phase disappears and two new phases (Cu10Zr7 and CuZr2) appear when 5.05.0). Cu50Zr50−xAlx (0x4.0) alloys are off-eutectic compositions while near-eutectic compositions for Cu50Zr50−xAlx (5.0x11.0) alloys. The Eg, Ex, and Ep decrease with increasing sensitive factor (β) for the studied Cu-based alloys characterized in the room-temperature brittleness. The dependence of the phase formation and GFA on the Al content is discussed. INTRODUCTIONCu-based bulk metallic glasses (BMGs) have been extensively investigated due to their interestingly properties including work hardening [1], martensitic transformation [2-5], magnetism [6], catalytic activity [7,8], cryogenic temperature plasticity [9] and room-temperature plasticity [10][11][12][13][14], which enable their applications as structural and functional materials.Cu-Zr binary alloy system is characterized by good glass forming ability (GFA) and wide composition region for the formation of glass alloys [15] Element minor addition/substitution is a well-known method for improving the GFA and other properties of glass forming alloys [6,[12][13][14]19,20]. For example, Mattern et al. [6] found that a ferromagnetic Gd-enriched nanocluster could form in Cu 50 Zr 50−x Gd x (x=5) metallic glasses due to the phase separation by Gd minor addition. Xi et al. [20] found that Gd minor addition improved the combination of the GFA and the room-temperature plasticity of Cu 46 Zr 47 Al 7 BMG. Ma et al. [12] investigated the effect of substituting Al by Ti on the GFA and the mechanical properties of brittle Cu 46 Zr 46 Al 8 BMG and found that the Ti addition significantly increased the plasticity although the characteristic temperatures including the glass transition temperature (T g ), onset crystallisation temperature (T x ) and supercooled liquid region (ΔT x ) decreased with increasing Ti content. Kuo et al. [13] investigated the effect of V on the phase formation and plasticity in Cu 47.5 Zr 47.5 Al 5 glassy alloy and found that V minor addition improved the plasticity by doubling the fracture strain to 9.4% in (Cu 47.5 Zr 47.5 Al 5 ) 99 V 1 due to the formation of B2-CuZr precipitates. Recently, Cai et al. [14] found that the substitution of Ti by Ni significantly influences the GFA, mechanical, electrical and thermal properties of Cu 50 Zr 40 Ti 10...

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Structural and magnetic nanoclusters in Cu50Zr50−xGdx (x=5at.%) metallic glasses

Cited by 21 publications

References 15 publications

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Effect of Ni substitution on glass forming ability, mechanical, electrical and thermal properties of Cu–Zr–Ti glass forming alloys

Phase formation, glass forming ability, mechanical and thermal properties of Cu50Zr50−x Al x (0⩽x⩽11.0) glass forming alloys

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