Mechanical Properties of Ultrafine-Structured Al-Si-Mg Alloy Produced by Hot Consolidation of Rapidly Solidified Flakes
Source abstract
Abstract
Nanostructured melt-spun aluminum A356 flakes were consolidated into bulk samples through hot pressing. The effects of rapid solidification and pressing conditions on the microstructure and mechanical properties of the alloy were investigated using x-ray diffractometer (XRD), optical microscopy (OM), field emission scanning electron microscopy (FE-SEM), microhardness, tensile and compression tests. The results indicate modification of the eutectic morphology to a fine fibrous one with uniform distribution due to the rapid solidification. The microstructure consists of homogenous dendritic structure with ultrafine size and spherical eutectic Si crystals with the diameter of about 50 nm. These factors increase microhardness (119 ± 8 HV) much higher than those made by conventional direct casting (DC) methods. As-spun ribbons also show high ultimate tensile strength (UTS) of 420 ± 25 MPa and a plastic strain of about 10 pct. Moreover, hot consolidation of as-spun flakes result in an ultrafine-structured bulk alloy, which has ideal interflake bonding, good microhardness (95 ± 6 HV) and high strength 285 ± 10 MPa due to the refined microstructure and the extended solubility of silicon in α-Al during the controlled consolidation method.
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Research context
OpenAlex topics: Aluminum Alloy Microstructure Properties · Aluminum Alloys Composites Properties · Microstructure and mechanical properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (43)
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