Formation of quasicrystals in bulk glass forming Zr-Cu-Ni-Al alloys
Identifieur interne : 000657 ( Main/Exploration ); précédent : 000656; suivant : 000658Formation of quasicrystals in bulk glass forming Zr-Cu-Ni-Al alloys
Auteurs : U. Köster [Allemagne] ; J. Meinhardt [Allemagne] ; S. Roos [Allemagne] ; R. Busch [États-Unis]Source :
- Materials Science & Engineering A [ 0921-5093 ] ; 1997.
English descriptors
Abstract
Abstract: Zr65Cu17.5Ni10Al7.5 as well as Zr69.5Cu12Ni11Al7.5 belong to the best glass forming alloys known. Transmission electron microscopy (TEM) and X-ray analysis of samples annealed above the glass transition temperature exhibit the formation of quasicrystalline microstructures. The metastable icosahedral phase is primitive with a quasilattice constant a = 0.253 nm; its composition is close to Zr69.5Cu12Ni11Al7.5. The growth of spherical shaped quasicrystals has been observed to be time-dependent (r ∞ t0.5), thus indicating a diffusion controlled transformation. The nucleation of the quasicrystals in Zr69.5Cu12Ni11Al7.5 was investigated by means of crystallization statistics and found to be heterogeneous and time-dependent. The nucleation rate reached a maximum at 410 °C. The temperature dependence of nucleation and growth rates can be described best assuming a Vogel-Fulcher-Tammann equation with B = 5710 K and T0 = 421 K. From differential scanning calorimetry (DSC) the enthalpy for the quasicrystal formation in Zr69.5Cu12Ni11Al7.5 has been estimated to be 2.4 kJ mol−1. Simulation of the observed nucleation and growth rates indicates an interfacial energy of about 13 mJ m−2. The heterogeneous nucleation of quasicrystals might result from quenching-in clusters with icosahedral structure.
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DOI: 10.1016/S0921-5093(97)80100-1
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Roos</name><affiliation wicri:level="3"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Department of Chemical Engineering, University of Dortmund, AG Werkstoffe und Korrosion, D -44221 Dortmund</wicri:regionArea><placeName><region type="land" nuts="1">Rhénanie-du-Nord-Westphalie</region><region type="district" nuts="2">District d'Arnsberg</region><settlement type="city">Dortmund</settlement></placeName></affiliation></author><author><name sortKey="Busch, R" sort="Busch, R" uniqKey="Busch R" first="R." last="Busch">R. Busch</name><affiliation wicri:level="1"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Material Science, CALTECH, Pasadena</wicri:regionArea><wicri:noRegion>Pasadena</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Materials Science & Engineering A</title><title level="j" type="abbrev">MSA</title><idno type="ISSN">0921-5093</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997">1997</date><biblScope unit="volume">226–228</biblScope><biblScope unit="supplement">C</biblScope><biblScope unit="page" from="995">995</biblScope><biblScope unit="page" to="998">998</biblScope></imprint><idno type="ISSN">0921-5093</idno></series><idno type="istex">69290A94E4760072DF76D47F8D41088886D43E68</idno><idno type="DOI">10.1016/S0921-5093(97)80100-1</idno><idno type="PII">S0921-5093(97)80100-1</idno><idno type="ArticleID">97801001</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0921-5093</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Crystallization</term><term>Metallic bulk glasses</term><term>Quasicrystals</term><term>Zr-Cu-Ni-Al</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Zr65Cu17.5Ni10Al7.5 as well as Zr69.5Cu12Ni11Al7.5 belong to the best glass forming alloys known. Transmission electron microscopy (TEM) and X-ray analysis of samples annealed above the glass transition temperature exhibit the formation of quasicrystalline microstructures. The metastable icosahedral phase is primitive with a quasilattice constant a = 0.253 nm; its composition is close to Zr69.5Cu12Ni11Al7.5. The growth of spherical shaped quasicrystals has been observed to be time-dependent (r ∞ t0.5), thus indicating a diffusion controlled transformation. The nucleation of the quasicrystals in Zr69.5Cu12Ni11Al7.5 was investigated by means of crystallization statistics and found to be heterogeneous and time-dependent. The nucleation rate reached a maximum at 410 °C. The temperature dependence of nucleation and growth rates can be described best assuming a Vogel-Fulcher-Tammann equation with B = 5710 K and T0 = 421 K. From differential scanning calorimetry (DSC) the enthalpy for the quasicrystal formation in Zr69.5Cu12Ni11Al7.5 has been estimated to be 2.4 kJ mol−1. Simulation of the observed nucleation and growth rates indicates an interfacial energy of about 13 mJ m−2. The heterogeneous nucleation of quasicrystals might result from quenching-in clusters with icosahedral structure.</div></front></TEI><affiliations><list><country><li>Allemagne</li><li>États-Unis</li></country><region><li>District d'Arnsberg</li><li>Rhénanie-du-Nord-Westphalie</li></region><settlement><li>Dortmund</li></settlement></list><tree><country name="Allemagne"><region name="Rhénanie-du-Nord-Westphalie"><name sortKey="Koster, U" sort="Koster, U" uniqKey="Koster U" first="U." last="Köster">U. Köster</name></region><name sortKey="Meinhardt, J" sort="Meinhardt, J" uniqKey="Meinhardt J" first="J." last="Meinhardt">J. Meinhardt</name><name sortKey="Roos, S" sort="Roos, S" uniqKey="Roos S" first="S." last="Roos">S. Roos</name></country><country name="États-Unis"><noRegion><name sortKey="Busch, R" sort="Busch, R" uniqKey="Busch R" first="R." last="Busch">R. 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