Advanced tensile properties and strain rate sensitivity of titanium matrix composites reinforced with CaTiO3 particles
Advanced tensile properties and strain rate sensitivity of titanium matrix composites reinforced with CaTiO3 particles
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CaTiO3 颗粒增强钛基复合材料的先进拉伸性能和应变率敏感性
DOI：
10.1016/j.jallcom.2021.163229
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发表时间：
2021-12
影响因子：
6.2
通讯作者：
Kondoh Katsuyoshi
中科院分区：
文献类型：
--
作者：
Yang Jinheng;Shen Jianghua;Liang Yanxiang;Shi Wendi;Chen Biao;Umeda Junko;Kondoh Katsuyoshi
在目前的工作中，一种新的加强，即，采用CaTiO3颗粒，通过粉末冶金工艺和热挤压工艺制备高性能钛基复合材料（TMCs）。结果表明，CaTiO 3颗粒成功地提高了Ti的强度，而不牺牲断裂伸长率。与大多数分解或与Ti基体反应的陶瓷颗粒相比，CaTiO 3颗粒在基体中保持化学不变。重要的是，与报道的具有尖角和不规则形状的碳化钛（TiC）和其他化学稳定颗粒不同，CaTiO 3颗粒显示出圆形轮廓，这可能会削弱基质中的应力集中。结果表明，仅添加2.5wt%的CaTiO3，屈服强度从纯钛的406 MPa提高到TMCs的800 MPa以上，而断裂伸长率保持在25%以上。有吸引力的机械性能归因于硬化晶界和几何必要位错（GNDs）所造成的CaTiO 3颗粒。此外，实验结果表明，由于颗粒诱导的位错钉扎和GNDs硬化效应，TMCs的应变速率敏感性也被发现增加。
In the present work, a novel reinforcement, i.e., CaTiO3 particles, was adopted to produce high performance Ti matrix composites (TMCs), via a powder metallurgy process followed by hot extrusion. The results revealed that the CaTiO3 particles successfully improved the strength of Ti without sacrificing the elongation to failure. In contrast with most of ceramic particles that decompose or react with Ti matrix, CaTiO3 particles remain chemically unchanged in the matrix. Importantly, unlike titanium carbide (TiC) and other chemically stable particles that are reported with sharp corner and irregular shapes, the CaTiO3 particles display a round profile that may weaken the stress concentration in the matrix. It is found that the yield strength increases from 406 MPa for pure Ti to more than 800 MPa for TMCs with only 2.5 wt% addition of CaTiO3, while maintaining the elongation to failure over 25%. The attractive mechanical property is attributed to the hardened grain boundaries and increased geometrically necessary dislocations (GNDs) caused by the CaTiO3 particles. Besides, the experimental results show that, due to the particle-induced strong dislocation pinning and GNDs hardening effect, the strain rate sensitivity was also found increased for TMCs.
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