| About this Abstract |
| Meeting |
Materials Science & Technology 2019
|
| Symposium
|
Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
|
| Presentation Title |
Strong and Ductile Novel Aluminium Metal Matrix Composites Reinforced with Ex-situ Carbon Nanotubes and In-situ Alumina Nanoparticles |
| Author(s) |
Biao Chen, Katsuyoshi Kondoh |
| On-Site Speaker (Planned) |
Biao Chen |
| Abstract Scope |
Existing high-strength aluminium (Al) alloys such as the 7000 series can offer both high tensile yield strength (>500 MPa for benchmark AA 7075-T6) and excellent tensile ductility (10%) but retain the intrinsically low elastic modulus of Al (~70 GPa). Al metal matrix composites (MMCs) can attain both high tensile yield strength (>500 MPa) and high elastic modulus (>90 GPa, close to that of high-strength beta-Ti alloys, e.g., 100 GPa for Ti-15333-T6) but at the expense of tensile ductility (<5%). We report the development of a novel class of Al materials that can offer tensile yield strength of 515±17 MPa, elastic modulus of 95.6±1.7 GPA and elongation of 10.4±0.8%. Our design hypothesis is to reinforce the Al matrix with ex situ introduced carbon nanotubes (CNTs) for primary strengthening but at the same time we craft a high number density of in situ formed ultrafine γ-Al2O3 nanoparticles to improve dimpled fracture. |