Dadbakhsh Sasan, Mertens Raya, Vanmeensel Kim, Ji Gang, Kruth Jean-Pierre
PMA, Department of Mechanical Engineering, KU Leuven and Member of Flanders Make, 3001, Leuven, Belgium.
Department of Production Engineering, KTH Royal Institute of Technology, 10044, Stockholm, Sweden.
Sci Rep. 2020 Jun 29;10(1):10523. doi: 10.1038/s41598-020-67434-3.
This work demonstrates a successful in situ method capable of producing an ultra-strong novel Ti composite without aluminium and vanadium. In this method, selective laser melting is used to conduct in situ alloying and reinforcing of a Ti/10.5 wt% MoC powder mixture. It is shown that this leads to a metastable β-Ti matrix homogeneously reinforced by high aspect ratio, 50-200 nm wide and up to several micrometre long TiC whiskers. The transformations of the phases are controlled by decomposition, dissolution, diffusion, and reformation of constituents. The whisker morphology of in situ formed TiC particles is associated with directional crystal growth along the TiC direction. The developed TiC reinforced β-Ti alloy combines a hardness over 500 HV, a Young's modulus of 126 GPa, and an ultimate compressive strength of 1642 MPa. Improving the ductility of this composite is the subject of another work.
这项工作展示了一种成功的原位方法，该方法能够生产出不含铝和钒的超强新型钛复合材料。在这种方法中，选择性激光熔化用于对Ti/10.5 wt% MoC粉末混合物进行原位合金化和增强。结果表明，这会导致形成一种亚稳β-Ti基体，该基体由高纵横比、宽度为50-200 nm且长度可达几微米的TiC晶须均匀增强。相的转变由成分的分解、溶解、扩散和再形成来控制。原位形成的TiC颗粒的晶须形态与沿TiC方向的定向晶体生长有关。所开发的TiC增强β-Ti合金的硬度超过500 HV，杨氏模量为126 GPa，极限抗压强度为1642 MPa。提高这种复合材料的延展性是另一项工作的主题。
