Effect of B4Cp content on microstructure and the high-temperature oxidation behavior of Ti-5.4Al-4.03Mo-3.93V-2.37Cr-0.01Zr composites

Abstract The paper discusses the effects of B 4 C particle (B 4 C p ) content on the microstructure and high-temperature oxidation resistance of B 4 C p /Ti-5.4Al-4.03Mo-3.93V-2.37Cr-0.01Zr composite prepared by powder metallurgy. The results demonstrate that grain size of the composites decreases by increasing reinforcement content from 1 to 3 wt.%, suggesting that B 4 C p can refine grain of the materials. For the composites with increasing B 4 C p content from 0 to 3 wt.%, the apparent porosity increase from 3.23 to 6.89%, indicating that the density of materials decreased with the increase of B 4 C P content. In addition, the hardness of the materials have been greatly improved. Comparing to the substrate 434.02 HV, the 1, 2, and 3 wt.% B 4 C P specimens are increased by 37.2%, 57.5%, and 84.7%, respectively. The weight of the oxidation product is reduced and the oxidation rate is slowed down, as the B 4 C P content increases. Moreover, the thickness of the oxide layer is greatly reduced, and the thickness of oxidation layer in composites with 0, 1, 2 and 3 wt.% B4CP specimens were 60, 55, 47 and 40 μ m, indicating that B 4 C P can improve the high-temperature oxidation resistance.