Abstract
New bimetal AZ31-CNT/AA5052 macrocomposite comprising: (a) carbon nanotube (CNT) reinforced magnesium alloy AZ31 shell and (b) aluminium alloy AA5052 millimeter-scale core reinforcement was fabricated using solidification processing followed by hot coextrusion. Microstructural characterisation revealed more rounded intermetallic particle of decreased size, reasonable CNT distribution, and dominant (1 0 -1 1) texture in the longitudinal and transverse directions in the AZ31-CNT nanocomposite shell. Interdiffusion of Mg and Al across the core-shell macrointerface into each other was also significant. Compared to monolithic AZ31, the AZ31-CNT shell had significantly higher hardness (+30%). In tension, the presence of CNT (in the AZ31 shell) and AA5052 core significantly increased stiffness (+39%), ultimate strength (+13%), failure strain (+17%) and work of fracture (+27%) of AZ31, while yield strength (-2%) was marginally decreased. In compression, the presence of CNT (in the AZ31 shell) and AA5052 core significantly increased yield strength (+35%), failure strain (+42%) and work of fracture (+70%) of AZ31, while ultimate strength (+1%) was marginally increased. The effect of joint presence of: (a) CNT (in the AZ31 shell) and (b) AA5052 millimeter-scale core on tensile and compressive properties of AZ31 is investigated in this paper.
| Original language | English |
|---|---|
| Pages (from-to) | 1490-1500 |
| Number of pages | 11 |
| Journal | Composites Part A: Applied Science and Manufacturing |
| Volume | 40 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 2009 |
Bibliographical note
Funding Information:Authors wish to acknowledge NUS research scholarship for PhD candidature of M. Paramsothy for supporting this research.
Keywords
- AZ31-CNT nanocomposite
- B. Fiber/matrix bond
- B. Mechanical Properties
- B. Microstructures
ASJC Scopus subject areas
- Ceramics and Composites
- Mechanics of Materials