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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Effect of Metalloid Addition on Anomalous Primary Crystallization of Al-RE Metallic Glasses
Author(s) Mustafacan Kutsal, Burcu Cam, Eren Yunus Kalay
On-Site Speaker (Planned) Mustafacan Kutsal
Abstract Scope Marginal glass forming alloys are known to show an anomalous primary crystallization reaction with unusually high nanocrystal number densities upon thermal devitrification. In order to get an insight of this puzzling behavior, we have studied the as-quenched states and devitrification of marginal glass forming Al90Y10 and Al87Y10Si3 metallic glasses with differential scanning calorimetry, X-ray diffraction, transmission electron microscopy and microhardness measurements. Our studies have shown that medium-range structural heterogeneity caused by chemistry alteration have direct impact on primary crystallization of Al-RE metallic glasses. Thermal analysis revealed that primary crystallization temperature is reduced from 480 K to 380 K with the addition of Si. Furthermore, microhardness measurements have showed 400 Hv hardness for Al87Y10Si3 metallic glasses, an ultrahigh value as compared to other Al-Rare-Earth based aluminum alloys. The underlying effects of Si addition will be discussed in detail with respect to short-to-medium-range correlations and corresponding structural models.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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Effect of Ca Additions on the Ageing Behavior of Mg-15Gd-0.5Zr Alloy
Effect of Metalloid Addition on Anomalous Primary Crystallization of Al-RE Metallic Glasses
Effects of Clustering and Trace Elements on Precipitation Hardening of Al-Mg-Si Alloys
Formation of Complex Intermetallic Phases from Supersaturated Co Solid Solution in a Co-3.9Nb Alloy
Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
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Precipitation Behavior in Ni-Ti-Zr Shape Memory Alloys
Predicting Orientation Relationships: A Simple Algorithm for Generating Near-coincidence Site Lattices in General Bravais Lattice Systems
Prediction of Size, Temperature and Composition-dependent Precipitate/Matrix Interfacial Energies
Self-organization by Strain Accommodation in the Formation of Long-range Stacking Order Structure in Mg-RE-TM Alloys
Spinodal Decomposition and Ordering Transformation in U6Nb Alloy
The Effects of ECAP on the Precipitation Behavior of Al 2024
The Role of Electron Microscopy in the Understanding of Precipitation in Light Alloys
Understanding the Precipitation and Orientation Relationships in Transition Metal Carbides and Nitrides

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