In-Situ (TiB+TiC) particulate reinforced titanium matrix composites: Effect of B^sub 4^C size and content

This study investigated the microstructure and tensile behavior of (TiB+TiC) reinforced titanium matrix composites (TMCs) using an in-situ reaction between Ti and B^sub 4^C. Different B4C sizes (1,500 and 150 [mu]m) and contents (0.94, 1.88 and 3.76 mass%) were added to pure Ti to produce 5, 10, and...

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Bibliographic Details
Published in:Metals and materials international 2013-11, Vol.19 (6), p.1301
Main Authors: Choi, Bong-jae, Kim, Young-jig
Format: Article
Language:English
Online Access:Get full text
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Summary:This study investigated the microstructure and tensile behavior of (TiB+TiC) reinforced titanium matrix composites (TMCs) using an in-situ reaction between Ti and B^sub 4^C. Different B4C sizes (1,500 and 150 [mu]m) and contents (0.94, 1.88 and 3.76 mass%) were added to pure Ti to produce 5, 10, and 20 vol% (TiB+TiC) reinforced TMCs. In-situ synthesized TiB and TiC reinforcements prepared with 150 [mu]m B^sub 4^C were very fine, and were distributed more homogeneously than the 1,500 [mu]m B^sub 4^C. As the TiB and TiC contents increased, the tensile strength increased and the ductility decreased compared to unreinforced pure Ti. The improvements in the tensile strength of TMCs were obtained by load transfer strengthening and an alpha-Ti matrix grain reduction of 9-26%. In addition, the TMCs produced using 150 [mu]m B^sub 4^C showed a greater tensile elongation of approximately 61-117%, with a slightly improved strength compared to that with 1,500 [mu]m B^sub 4^C. The tensile elongation of TMCs obtained with 150 [mu]m B^sub 4^C was enhanced because the coarse reinforcements produced by 1,500 [mu]m B^sub 4^C were more easily and frequently cracked at the fracture surface.[PUBLICATION ABSTRACT]
ISSN:1598-9623
2005-4149
DOI:10.1007/s12540-013-6024-9