Nanostructure evolution, thermal stability and hardness of amorphous Al–Cu-Y (Co, La) (at.%) alloys
Source abstract
Abstract
Al alloys with nominal composition of Al 86Cu 6Y 6Co 2, Al 86Cu 6Y 6La 2 and Al 84Cu 6Co 2Y 6La 2 (at.%) were studied in as- spun and annealed states using differential scanning calorimetry (DSC), field emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD) and microhardness. The effect of La and Co atoms and annealing temperature on enhancement of glass forming ability, thermal stability and hardness of Al–Cu–Y based alloys were investigated. The results show the amorphous Al 84Cu 6Co 2Y 6La 2 alloy with higher RE (Y, La) contents and more elements is thermally stable up to 618±2 K while primary crystallization occurs. It also indicates the highest hardness of 378.1 ± 15.3 HV which enhances even more to 394.2 ± 16.8 HV after primary crystallization due to nano-sized α-Al crystals formation. The hardness of the alloy decreases to 340.3 ± 16.4 HV after the second crystallization reaction, possibly because of the presence of some weak intermetallic compound, growth of the α-Al and crystallization of the amorphous matrix.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys · Aluminum Alloys Composites Properties · Quasicrystal Structures and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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