Thermal behaviour of amorphous CuxZr1−x powders synthesized by mechanical alloying

Ohshiro, Hiroki; Arakawa, Tsuyoshi

doi:10.1016/0925-8388(94)90849-4

Cited by 8 publications

(6 citation statements)

References 11 publications

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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: 62%

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: 62%

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Cullinan

Kalay

et al. 2014

Metall Mater Trans A

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“…Using a much lower heating rate (0.835 K/min), Kneller and CuZr 2 . Of the five [41,47,50,58,62] studies that shared this result in common, two [58,62] reported a second exothermic event around 773 K and 783 K, respectively, during thermal analysis. Only one [58] of those studies reported on the phase evolution corresponding with the second exotherm, associating it with the growth (increased fraction) of CuZr 2 .…”

Section: Refmentioning

confidence: 64%

Crystallization dynamics in glass-forming systems

Cullinan¹

2016

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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, that was associated with complete crystallization 5 involving the formation of Cu 10 Zr 7 and CuZr 2 . Of the five [41,47,50,58,62] studies that shared this result in common, two [58,62] reported a second exothermic event around 773 K and 783 K, respectively, during thermal analysis. Only one [58] of those studies reported on the phase evolution corresponding with the second exotherm, associating it with the growth (increased fraction) of CuZr 2 .…”

Section: Review Of Constant-heating Rate Devitrification Studiesmentioning

confidence: 64%

“…For each fitting, the corresponding data set was truncated such that only the points surrounding the isothermal peak down to one percent of the peak height were considered. * In the case of [47], the samples were mechanically alloyed via ball milling.…”

Section: Appendix -Jmak Fitting Proceduresmentioning

confidence: 99%

“…The devitrification of Cu-Zr binary metallic glasses has been studied extensively, partly because this system features strong glass formation tendency [3] and a wide composition range within which glassy alloys can be achieved by quenching from the melt [4,5], as shown in [35,36,37,38,39,40,41,42,43,44,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,6,62,63] and [45,47], respectively), these studies generally fall short of completely describing the devitrification behavior as a result of poor data arising from the chosen experimental method (e.g. conventional XRD rather than HEXRD) or insufficient data arising from too few (or no) experimental measurements and microstructural observations.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization dynamics in glass-forming systems

Cullinan

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Thermal behaviour of amorphous CuxZr1−x powders synthesized by mechanical alloying

Cited by 8 publications

References 11 publications

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Kinetics and Mechanisms of Isothermal Devitrification in Amorphous Cu50Zr50

Crystallization dynamics in glass-forming systems

Crystallization dynamics in glass-forming systems

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