2008
DOI: 10.1007/s11661-007-9415-z
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Multistage Devitrification Behavior of Mg65Cu25Tb10 Bulk Metallic Glass

Abstract: The devitrification of Mg 65 Cu 25 Tb 10 bulk metallic glass (BMG) has been studied by timeresolved small angle X-ray scattering (SAXS) and wide angle X-ray scattering (WAXS) simultaneously. By analyzing the interference peaks on SAXS patterns and the Bragg peaks on WAXS patterns, it is found that devitrification initiates by activation of quenched-in shortrange orders. Crystallization proceeds in three stages. During stage I, icosahedral clusters are formed that transforms to a quasi-crystalline 1/1 approxima… Show more

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Cited by 6 publications
(3 citation statements)
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“…Evidence for decomposition was also obtained in Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 bulk metallic glass [68]. In contrast, in Cu 43 Zr 43 Al l7 Ag 7 , crystallization is a single step phase transformation [69,70], while in Mg 65 Cu 25 Tb 10 , crystallization proceeds in three stages [71]. During stage I, icosahedral clusters are formed that transforms to a quasi-crystalline approximant during stage II and finally the orthorhombic Mg 2 Cu phase is obtained.…”
Section: Discussionmentioning
confidence: 79%
“…Evidence for decomposition was also obtained in Zr 52.5 Cu 17.9 Ni 14.6 Al 10 Ti 5 bulk metallic glass [68]. In contrast, in Cu 43 Zr 43 Al l7 Ag 7 , crystallization is a single step phase transformation [69,70], while in Mg 65 Cu 25 Tb 10 , crystallization proceeds in three stages [71]. During stage I, icosahedral clusters are formed that transforms to a quasi-crystalline approximant during stage II and finally the orthorhombic Mg 2 Cu phase is obtained.…”
Section: Discussionmentioning
confidence: 79%
“…When heating an MG to the supercooled liquid region between glass transition T g and crystallization temperature T x , the structure of glass first relaxes and then crys-017104-3 tallization takes place. [30][31][32][33][34][35] Novel microstructures and interfaces with an unusually large number of nanoscale precipitates could be synthesized using the principles of relaxation and crystallization studies. However, the atomic-to nanoscale mechanisms of relaxation and crystallization for MGs are long-standing issues for two reasons.…”
Section: Structure Stability Of Mgsmentioning
confidence: 99%
“…In some cases, the presence of nanocrystals in the amorphous matrix can enhance the strength of the material [9], so it is of interest the study of the early crystallisation stages in order to determine the crystalline phases involved. For Mg 65 Cu 25 Tb 10 [10] the formation of quasicrystalline phases is reported, that transform to Mg 2 Cu, Mg 3 Tb and unidentified phases during a second crystallisation stage. For Mg 65 Cu 25 Y 10 amorphous alloy, Murty and Hono [11] suggest the formation, as crystallisation products, of an Y containing Mg 2 Cu, via polymorphic crystallisation.…”
Section: Introductionmentioning
confidence: 97%