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SUMMARY:Continuous chemical redistribution following amorphous-to-crystall
 ine structural ordering in a Zr-Cu-Al bulk metallic glass
DTSTART;VALUE=DATE-TIME:20211125T074100Z
DTEND;VALUE=DATE-TIME:20211125T074200Z
DTSTAMP;VALUE=DATE-TIME:20260306T081215Z
UID:indico-contribution-4348@events01.synchrotron.org.au
DESCRIPTION:Speakers: Xuelian Wu ()\nBulk metallic glasses (BMGs) are ther
 modynamically metastable. As such\, crystallization occurs when a BMG is t
 hermally annealed at a temperature above the glass transition temperature.
  While extensive studies have been performed on the crystallization kineti
 cs of BMGs\, most of them have focused on the amorphous-to-crystalline str
 uctural ordering\, and little attention has been paid to chemical distribu
 tion and its relationship with the structural ordering during the crystall
 ization process. In this paper\, a new approach\, with simultaneous differ
 ential scanning calorimetry (DSC) and small angle neutron scattering (SANS
 ) measurements\, was applied to study in situ the crystallization of a Zr4
 5.5Cu45.5Al9 BMG upon isothermal annealing at a temperature in the superco
 oled liquid region. Quantitative analysis of the DSC and SANS data showed 
 that the structural evolution during isothermal annealing could be classif
 ied into three stages: (I) incubation\; (II) amorphous-to-crystalline stru
 ctural ordering\; (III) continuous chemical redistribution. This finding w
 as validated by composition analysis with atom probe tomography (APT)\, wh
 ich further identified a transition region formed by expelling Al into the
  matrix. The transition region\, with a composition of (Cu\,Al)50Zr50\, se
 rved as an intermediate step facilitating the formation of a thermodynamic
 ally stable crystalline phase with a composition of (Cu\,Al)10Zr7.\n\nhttp
 s://events01.synchrotron.org.au/event/146/contributions/4348/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4348/
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