Fabrication of TiB2/Al composite by melt-SHS process with different content of titanium powder. Issue 12 (23rd May 2017)

• Record Type: Journal Article
• Authors: Li, He; Chai, Lihua; Wang, Haijing; Chen, Ziyong; Shi, Guodong; Xiang, Zhilei; Jin, Tounan
• Is Part Of: Journal of materials research. Volume 32:Issue 12(2017)
• Page Start: 2352
• Page End: 2360
• Publication Date: 2017-05-23
• Subjects: TiB2, -- composite, -- SHS, -- oxide, -- titanium powder; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2017.184
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : Melt-SHS (self-propagating high-temperature synthesis), based on the SHS process and oxide reaction method, was used for preparation of TiB2 /Al composites. The mass ratio of two reactants, Ti powder/TiO2, in initial powder mixture was varied from 0:1 to 1:0. The results showed that the 5 wt% TiB2 /Al composites could be successfully produced by a reaction of aluminum powder, TiO2, and B2 O3 in Al melt at 950 °C, while the reaction rate was slow. The addition of titanium powder helps to reduce the content of Al2 O3 and destroy the coating structure of Al2 O3 covered TiB2 particles, which leads to the acceleration of reaction process and improvement of particle concentration. A significant improvement was that TiB2 particles were dispersively distributed when the mass ratio of Ti powder/TiO2 was 2:3. As a result, the 5 wt% TiB2 /Al composites fabricated by melt-SHS process with modified reactants ratio showed excellent tensile properties with the ultimate tensile strength as high as 114.24 MPa. Besides, the composite also showed superior ductility.