Designing high-temperature oxidation-resistant titanium matrix composites via directed energy deposition-based additive manufacturing. (15th December 2021)

• Record Type: Journal Article
• Authors: Traxel, Kellen D.; Bandyopadhyay, Amit
• Is Part Of: Materials & design. Volume 212(2021)
• Publication Date: 2021-12-15
• Subjects: Directed energy deposition -- Titanium -- Boron nitride -- Boron carbide -- Oxidation resistance; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2021.110205
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: Use of directed energy deposition-based additive manufacturing to design Ti-matrix composites. In situ ceramic reinforcement improved oxidation resistance of Ti matrix composites. Input energy had a significant impact on microstructure and oxidation resistance. Abstract: Composite material development via laser-based additive manufacturing offers many exciting advantages to manufacturers; however, a significant challenge exists in our understanding of process-property relationships for these novel materials. Herein we investigate the effect of input processing parameters towards designing an oxidation-resistant titanium matrix composite. By adjusting the linear input energy density, a composite feedstock of titanium-boron carbide-boron nitride (5 wt% overall reinforcement) resulted in a highly reinforced microstructure composed of borides and carbides and nitrides, with variable properties depending on the overall input energy. Crack-free titanium-matrix composites with hardness as high as 700 ± 17 HV0.2/15 and 99.1% relative density were achieved, with as high as a 33% decrease in oxidation mass gain in the air relative to commercially pure titanium at 700 °C for 50 h. Single-tracks and bulk samples were fabricated to understand the processing characteristics and in situ reactions during processing. Our results indicate that input processing parameters can play a significant role in the oxidation resistance of titanium matrix composites and can be exploited by manufacturers for improving component performance and high temperature designs.