Mechanical Properties and Strengthening Mechanism of Pure Ti Powder Composite Material Reinforced with Carbon Nano Particles
Mechanical Properties and Strengthening Mechanism of Pure Ti Powder Composite Material Reinforced with Carbon Nano Particles
复制标题
纳米碳颗粒增强纯钛粉复合材料的力学性能及强化机理
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
K. Kondoh
中科院分区：
文献类型：
--
作者：
Takanori Mimoto;Nozomi Nakanishi;J. Umeda;K. Kondoh
对钛-炭黑（CB）纳米颗粒复合材料的强化机理进行了定量研究。采用粉末冶金（P/M）方法制备钛基复合材料（TMC）试样，包括对未捆绑的碳纳米颗粒复合钛（Ti）粉末进行湿包覆、火花等离子烧结（SPS）固结和热挤压。挤出的TMC含碳量为2.66 at。%，室温拉伸强度为837 MPa，室温拉伸强度为899 MPa，伸长率为18.7%。在该复合材料中，一些添加的CB纳米颗粒作为固溶体元素溶解在Ti基体中。其余的碳化物在烧结时与Ti基体发生化学反应，生成原位形成的碳化钛（TiC）化合物，并均匀分布在Ti基体中。这些TiC分散体促进了热挤压过程中的动态再结晶，导致Ti晶粒细化。碳固溶硬化、TiC弥散强化和晶粒细化均增强了TMC的力学性能。其中，TiC增强剂的作用最为显著，约占整体强化行为的60%。
The strengthening mechanisms of titanium-carbon black (CB) nano particle composite materials were investigated quantitatively in the present study. The titanium matrix composite (TMC) specimens were prepared via a powder metallurgy (P/M) route including the wet coating process for composite titanium (Ti) powders with un-bundled CB nano particles, consolidation by spark plasma sintering (SPS) and subsequent hot extrusion. The extruded TMC, with carbon content of 2.66 at.%, exhibited excellent tensile strength of 837 MPa in 0.2%YS, 899 MPa in UTS and 18.7% in elongation at ambient temperature. In this composite, some of additive CB nano particles were dissolved into the Ti matrix as a solid solution element. The other CBs and Ti matrix were chemically reacted when sintering, and resulted in the in-situ formed titanium carbide (TiC) compounds, which were uniformly distributed throughout the Ti matrix. These TiC dispersoids promoted the dynamic recrystallization during hot extrusion process, and resulted in the Ti grain refinement. Consequently, carbon solid solution hardening, TiC dispersion strengthening and grain refinement enhanced the mechanical performance of the TMC. In particular, the effect of TiC reinforcements, accounting for about 60% of the whole strengthening behavior, played the most significant role.