|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Orientation Relationships of Precipitates with the Matrix in an Aluminium Quasicrystalline Alloy
||Franc Zupanic, Tonica Boncina, Christian Gspan
|On-Site Speaker (Planned)
Aluminium quasicrystalline alloys represent a novel class of high-strength alloys. They possess a high potential for practical applications in many fields. In this study, we used a quasicrystalline Al-alloy with a copper addition to achieving strengthening by heat treatment. The alloys were prepared by melt-spinning and casting into a copper mould. In both cases, quasicrystals formed during solidification either as a primary phase or as a part of a quasicrystal-containing eutectic. Afterwards, the samples were subjected to T5 heat treatment. The hardness of melt-spun ribbons increased considerably while the hardness of gravitationally cast samples did not change noticeably. A detailed investigation using transmission electron microscopy (TEM) showed that different types of precipitates can form. At lower temperatures binary Al-Cu precipitates formed, in the intermediate region prevailed the quasicrystalline precipitates, while at higher temperatures formed Al20Mn3Cu2 precipitates. Particular attention was given to determination of their orientation relationships with the Al-rich matrix.
||Planned: Light Metals Volume