Effect of Ti/C additions on the formation of Al3Ti of in situ TiC/Al composites

✍ Scribed by Bin Yang; Guoxiang Chen; Jishan Zhang

• Publisher: Elsevier Science
• Year: 2001
• Weight: 792 KB
• Volume: 22
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/s0261-3069(01)00029-2

✦ Synopsis

A novel technique for fabricating TiC particulate-reinforced commercial purity Al composites was introduced. The mechanism of formation of brittle Al Ti up to 30 m in size produced in the composites was studied and a method of eliminating them was 3 Ž . put forward. The results show that: 1 the brittle Al Ti phase is always present in the composites when the Ti:C molar ratio is 3 1:1. In this case, the tensile elongation of the composite was only 4%, much lower than the value of unreinforced aluminum Ž . Ž . 20% ; and 2 the formation of the brittle Al Ti phase can be eliminated entirely from the final product by using a proper Ti:C 3 molar ratio of 1:1.3 in the Ti᎐C᎐Al preforms. In this case, the tensile elongation of this composite was 10%, higher than the Ž . value of the composite with a lot of Al Ti 4% . Moreover, improvement in the tensile elongation of the composite was 3 accompanied by an increase of the ultimate tensile strength.