High-Temperature Strengthening and Toughening Mechanisms of Micro-Nano Ti2AlC Reinforced TiAl Composites
Received date: 2023-02-18
Revised date: 2023-05-26
Online published: 2023-08-22
Supported by
National Natural Science Foundation of China(52001262);National Natural Science Foundation of China(52001283);National Natural Science Foundation of China(52171120);Key Technology Research and Development Program of Henan Province(212102210447);Key Technology Research and Development Program of Henan Province(222102230041)
Metal matrix composites reinforced with micro-nano particles have emerged as a promising avenue for the development of advanced structural materials. Such composites can considerably enhance the strength and toughness of metals. TiAl composites with reinforced micro-nano Ti2AlC particles exhibit excellent mechanical properties at room temperature and impressive oxidation resistance at high temperatures. However, there is limited study on the tensile behavior of micro-nano particles reinforced TiAl composites. The impact of micro-nano particles on the tensile fracture of TiAl composites at high temperatures remains largely unexplored; hence, it is crucial to investigate the high-temperature strengthening and toughening mechanisms of micro-nano Ti2AlC particles reinforced TiAl composites. In this study, micro-nano Ti2AlC particles reinforced TiAl composites were in situ synthesized by spark plasma sintering (SPS) at 1250-1350oC using Ti-48Al-2Nb-2Cr prealloyed powders with addition of 0.5% graphene oxide. With increase in sintering temperature, various microstructures of Ti2AlC/TiAl composites were observed, ranging from near fully lamellar to coarse fully lamellar. The high-temperature tensile properties of these composites with varying microstructures at 800 and 850oC at a strain rate of 0.0001 s-1 were systematically studied. The corresponding strengthening and toughening mechanisms were discussed based on the observed fracture morphologies. The findings revealed that the composites reinforced with micro-nano Ti2AlC particles, especially those with near and fine fully lamellar structures, exhibited a synergy between strength and ductility at high temperatures. For instance, the fine fully lamellar Ti2AlC/TiAl composite displayed ultimate tensile strength of 496 MPa and a fracture strain of 10.7% at 850oC and 0.0001 s-1. This represents a 50oC increase in working temperature compared to that of the fully lamellar Ti-48Al-2Nb-2Cr alloy (The ultimate tensile strength and fracture strain at 800oC and 0.0001 s-1 were 467 MPa and 4.5%, respectively). The enhanced high-temperature properties of the Ti2AlC/TiAl composites were primarily attributed to the micro-nano Ti2AlC particles, which refined the lamellar colonies and hindered dislocation movement and crack propagation.
CHEN Zhanxing , WANG Yupeng , RONG Guangfei , ZHANG Xinfang , MA Tengfei , WANG Xiaohong , XING Qiuwei , ZHU Dongdong . High-Temperature Strengthening and Toughening Mechanisms of Micro-Nano Ti2AlC Reinforced TiAl Composites[J]. Acta Metall Sin, 2024 , 60(12) : 1746 -1754 . DOI: 10.11900/0412.1961.2023.00067
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