A highly-dense aluminum (Al)/carbon nanotubes (CNTs) composite is produced via a two-step consolidation process for micro-alloying assisted sintering after hot pressing. First, Al-5. vol% CNTs powder is covered with zinc (Zn) flakes by mechanical milling. During high-pressure pressing at 500. °C, the Zn flakes melt along the Al/CNTs powder boundaries by capillary action, providing the initial densification. Further densification is accomplished by micro-alloying Zn and Al atoms during sintering at 450. °C. The composite with 4. vol% Zn shows ~98% relative density and ~520. MPa compressive strength after precipitation hardening.
Bibliographical noteFunding Information:
This research was supported by the Korea Science and Engineering Foundation Grant (No. 2012R1A1A2042329 ). H.J. Choi acknowledges the support by Basic Science Research Program ( 2009-0093814 and 2013R1A1A3005759 ) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education .
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering