Anomalous strengthening by supersaturated solid solutions of selectively laser melted Al–Si-based alloys
| Autor: | Hirohisa Kodaira, Makoto Kobashi, Mulin Liu, Naoki Takata, Asuka Suzuki |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Materials science Aluminum alloy Annealing (metallurgy) Additive manufacturing Alloy Biomedical Engineering 02 engineering and technology engineering.material Industrial and Manufacturing Engineering 020901 industrial engineering & automation Ultimate tensile strength General Materials Science Diamond cubic Selective laser melting Composite material Engineering (miscellaneous) Rapid solidification Strain hardening Strain hardening exponent 021001 nanoscience & nanotechnology Microstructure engineering 0210 nano-technology Transmission electron microscopy Solid solution |
| Zdroj: | Additive Manufacturing. 33:101152 |
| ISSN: | 2214-8604 |
| Popis: | To identify the dominant contributing factor in the anomalously high strength of Al–Si-based alloys fabricated by selective laser melting (SLM), microstructural characteristics of a SLM-built Al–10Si–0.3 Mg alloy (AlSi10Mg) and their changes upon annealing at elevated temperatures were investigated. The as-built AlSi10Mg alloy exhibits a peculiar microstructure comprising of a number of columnar α-Al (fcc) phase with concentrated Si in solution. Numerous nano-sized particles were observed within the α-Al matrix. At elevated temperatures, a number of Si phase (diamond structure) precipitates consumed the solute Si in the columnar α-Al phase, but the microstructure of the α-Al matrix changed slightly. After annealing at elevated temperatures, the tensile strength of the as-built AlSi10Mg alloy substantially decreased accompanied by a reduction in the strain hardening rate. The supersaturated solid solution of the α-Al phase containing numerous nano-sized particles enhanced the strain hardening, resulting in the anomalous strengthening of the SLM-built AlSi10Mg alloy. The microstructural features were formed due to rapid solidification at an extremely high cooling rate in the SLM process, which provides important insights into controlling the strength of Al–Si-based alloys fabricated by SLM. ファイル公開日: 2022/05/01 |
| Databáze: | OpenAIRE |
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