In situ reactions during direct laser deposition of Ti-B4C composites. (1st July 2020)

• Record Type: Journal Article
• Authors: Nartu, Mohan Sai Kiran Kumar Yadav; Mantri, Srinivas A.; Pantawane, Mangesh V.; Ho, Yee-Hsien; McWilliams, Brandon; Cho, Kyu; Dahotre, Narendra B.; Banerjee, Rajarshi
• Is Part Of: Scripta materialia. Number 183(2020)
• Page Start: 28
• Page End: 32
• Publication Date: 2020-07-01
• Subjects: Additive manufacturing -- Titanium matrix composites -- Born -- Carbide -- In-situ reactions; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2020.03.021
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Direct laser deposition of a mixture of titanium (Ti) and boron-carbide (B4 C), using the laser engineered net shaping process, results in a complex multi-phase Ti matrix composite due to the incipient interfacial reactions between liquid titanium and solid/partially melted B4 C. Detailed microstructural characterization, at multiple length scales, reveals that titanium boride (TiB) precipitates are the initial reaction product which act as heterogeneous nucleation sites for TiC precipitates. Both the TiB and TiC precipitates in turn act as heterogeneous nucleation sites for fine β-Ti grains, within the retained liquid titanium, which eventually transform into fine equiaxed α-Ti grains comprising the matrix. Graphical abstract: Image, graphical abstract