Microstructural evolution and mechanical properties of near α-Ti matrix composites reinforced by hybrid (TiB+Y2O3) with bimodal size

• Published in: Vacuum Vol. 144; pp. 203 - 206
• Main Authors: Qu, J.P., Zhang, C.J., Han, J.C., Zhang, S.Z., Yang, F., Chen, Y.Y.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2017
• Subjects: Mechanical properties; Microstructure; TiB; Titanium matrix composites; Y2O3; Mechanical properties; Y2O3; Microstructure; TiB; Titanium matrix composites
• ISSN: 0042-207X; 1879-2715
• DOI: 10.1016/j.vacuum.2017.08.001

In this study, bimodal size (TiB + Y2O3)/near α-Ti composites were fabricated by in situ casting route. The uniformly distributed micron TiB and micro-or nano size Y2O3 lead to significant changes in matrix microstructure and compressive properties. With the decreasing of TiB/Y2O3 volume ratios, significant refinement of α colony and gradual improvement of compressive strength can be obtained. As TiB/Y2O3 volume ratio reaches 4:1, the composite displays the optimal ultimate compressive strength and ductility. And the relative strengthening mechanism along with the evolution of the compressive ductility is discussed. •Bimodal size particles reinforced titanium matrix composites are prepared.•The α colony is significantly refined with decreasing of TiB/Y2O3 volume ratios.•The optimum compressive ultimate strength is 2420 MPa with ductility of 14.08%.