Abstract
Boron nitride nanosheets (BNNSs) reinforced titanium (Ti) matrix composites possess a combination of high strength and ductility due to the in-situ synthesized nano-configurations consisting of BNNSs, titanium boride (TiB) and titanium diboride (TiB2). The mechanisms for the outstanding properties, however, are yet fully unraveled. In this study, BNNSs/Ti composites with various nano-configurations are investigated by molecular dynamics (MD) simulation. Results show that the tensile strength and ductility of the composites increase with the number and length of titanium borides (TiBx). The excellent ductility is attributed to the crack-blocking and internal stress redistribution effects of the well-bonded TiBx nanophases. The strength enhancement mainly arises from the improved dislocation strengthening and load-transfer efficiency brought by the nano-interlocking structure. This work can benefit the optimization of BNNSs/Ti composites for fulfilling the strengthening and toughening potential of BNNS.
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