硼化钛晶须增强Ti-6Al-4V合金基复合材料的强化机制，其中硼化钛晶须的取向垂直于加载方向

Strengthening Mechanism of Titanium Boride Whisker-Reinforced Ti-6Al-4V Alloy Matrix Composites with the TiB Orientation Perpendicular to the Loading Direction.

作者信息

Kurita Hiroki, Suzuki Shiori, Kikuchi Shoichi, Yodoshi Noriharu, Gourdet Sophie, Narita Fumio

机构信息

Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan.

Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University, Hamamatsu 432-8561, Japan.

出版信息

Materials (Basel). 2019 Jul 28;12(15):2401. doi: 10.3390/ma12152401.

DOI:10.3390/ma12152401

PMID:31357679

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6695840/

Abstract

We fabricated fully dense titanium boride (TiB) whisker-reinforced Ti-6Al-4V alloy matrix (Ti6Al4V-TiB) composites, with a homogeneous dispersion, a TiB orientation perpendicular to the loading direction (; two-dimensional random direction) and an intimate Ti/TiB interface without an intermediate interfacial layer in the Ti-6Al-4V alloy matrix, by spark plasma sintering. Microstructural analysis allows us to present the tensile properties of the Ti6Al4V-TiB composites with the theories for discontinuous fiber-reinforced composites. The Ti6Al4V-TiB 10 vol.% composite yielded a Young's modulus of 130 GPa, an ultimate tensile strength (UTS) of 1193 MPa and an elongation of 2.8%. The obtained experimental Young's modulus and UTS of the Ti6Al4V-TiB composites were consistent with the theoretical values estimated by the Halpin-Tsai and Shear-lag models. The good agreement between our experimental results and these models indicates that the TiB whiskers behave as discontinuous fibers in the Ti-6Al-4V alloy matrix.

摘要

我们通过放电等离子烧结制备了完全致密的硼化钛（TiB）晶须增强Ti-6Al-4V合金基（Ti6Al4V-TiB）复合材料，其具有均匀的分散性、TiB取向垂直于加载方向（二维随机方向）以及Ti-6Al-4V合金基体中没有中间界面层的紧密Ti/TiB界面。微观结构分析使我们能够用不连续纤维增强复合材料的理论来阐述Ti6Al4V-TiB复合材料的拉伸性能。10体积%的Ti6Al4V-TiB复合材料的杨氏模量为130 GPa，极限抗拉强度（UTS）为1193 MPa，伸长率为2.8%。Ti6Al4V-TiB复合材料获得的实验杨氏模量和UTS与通过Halpin-Tsai模型和剪滞模型估算的理论值一致。我们的实验结果与这些模型之间的良好一致性表明，TiB晶须在Ti-6Al-4V合金基体中表现为不连续纤维。