Boron nitride nanotube reinforced titanium metal matrix composites with excellent high-temperature performance. Issue 19 (29th August 2017)

• Record Type: Journal Article
• Authors: Bhuiyan, Md Mahedi Hasan; Wang, Jiangting; Li, Lu Hua; Hodgson, Peter; Agarwal, Arvind; Qian, Ma; Chen, Ying
• Is Part Of: Journal of materials research. Volume 32:Issue 19(2017)
• Page Start: 3744
• Page End: 3752
• Publication Date: 2017-08-29
• Subjects: titanium, -- composite, -- sintering; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2017.345
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : Boron nitride nanotube (BNNT) reinforced titanium (Ti) matrix composites were prepared using the cold press-and-sinter method. In the composite sintered at 800 °C for 1 h, BNNTs were homogeneously distributed in the Ti matrix and restricted the growth of Ti grains. The compressive strength of the as-sintered Ti–4 vol% BNNT composite achieved 985 MPa at room temperature versus 678 MPa without the BNNT reinforcements. The highest compressive strength of 277 MPa at 500 °C was obtained from the Ti–5 vol% BNNT composite. When sintered at 1000 °C, chemical reactions occurred between Ti and BNNTs leading to the formation of the interfacial TiB phase, which serves as a strong binding between BNNTs and the Ti matrix. The reinforcements were attributed by a mixture of BNNTs and TiB after sintering at 1000 °C for 3 h. However, no BNNT was observed in the microstructure after sintering at 1100 °C for 3 h due to complete transformation into TiB whiskers.