In situ ceramic particle-reinforced aluminum matrix composites fabricated by reaction pressing in the TiO{sub 2} (Ti)-Al-B (B{sub 2}O{sub 3}) systems
- Chinese Academy of Science, Shenyang (China). Inst. of Metals Research
- City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Physics and Materials Science
Particulate TiB{sub 2} reinforced aluminum-based metal matrix composites (MMCs) were successfully fabricated by means of the reaction processing method. TiB{sub 2} particulates were formed in situ through the reaction of Ti and B in Ti-Al-B, TiO{sub 2} and B in TiO{sub 2}-Al-B, and TiO{sub 2} and B{sub 2}O{sub 3} in TiO{sub 2}-Al-B{sub 2}O{sub 3} systems. The results showed that in situ TiB{sub 2} particulates formed in the Ti-Al-B system had a size of 5 {micro}m and they exhibited block and rodlike structures. Moreover, coarse Al{sub 3}Ti blocks several tens of micrometers in size were also formed simultaneously. On the other hand, equiaxed Al{sub 2}O{sub 3} and TiB{sub 2} particulates with a size of less than 2 {micro}m were formed in situ in the TiO{sub 2}-Al-B and TiO{sub 2}-Al-B{sub 2}O{sub 3} systems. The Al{sub 3}Ti phase was completely eliminated in the TiO{sub 2}-Al-B system with increasing B content. Tensile tests revealed that the Al{sub 2}O{sub 3} {center_dot} TiB{sub 2}/Al composite fabricated from the TiO{sub 2}-Al-B system exhibits excellent mechanical properties. The yield strength of the Al{sub 2}O{sub 3} {center_dot} TiB{sub 2}/Al composite appeared to increase with increasing TiB{sub 2} content. The yield strength of the Al{sub 2}O{sub 3} {center_dot} TiB{sub 2}/Al composite could be further increased by introducing CuO into the TiO{sub 2}-Al-B system. Such an increment in mechanical strength arose from the strengthening effect caused by the Al{sub 2}Cu precipitates. The incorporation of CuO had no effect on the in situ reaction process of the TiO{sub 2}-Al-B system. Finally, the effect of SiC addition on the microstructure and mechanical properties of the composites fabricated from the TiO{sub 2}-Al-B and TiO{sub 2}-Al-B-CuO systems was also investigated.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 544066
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 9 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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