Microstructure and mechanical properties of micro-nano Ti2AlC-reinforced TiAl composites

被引：55
作者：
Ma, Tengfei [1 ]
Li, Qiaoyu [1 ]
Wang, Yupeng [1 ]
Wang, Xiaohong [1 ]
Dong, Duo [1 ]
Zhu, Dongdong [1 ]
机构：
[1] Quzhou Univ, Key Lab Air Driven Equipment Technol Zhejiang Pro, Quzhou 324000, Peoples R China
来源：
INTERMETALLICS | 2022年 / 146卷
基金：
中国国家自然科学基金;
关键词：
Composites; TiAl alloys; Compressive properties; Tribological properties; TRIBOLOGICAL PROPERTIES; ALLOY; TEMPERATURE; EVOLUTION;
D O I：
10.1016/j.intermet.2022.107563
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In order to improve the mechanical properties of TiAl alloys, micro-nano Ti2AlC-reinforced TiAl composites were successfully fabricated by means of spark plasma sintering (SPS) using the ball-milled multilayer graphene oxide and Ti-48Al-2Nb-2Cr pre-alloyed powders. The micro-nano Ti2AlC phase precipitated at the interface between alpha(2)-Ti3Al and gamma-TiAl phases utilizing the reaction of TiAl and high-activity graphene. Fully lamellar structure was obtained after sintering above 1300 degrees C, and Ti2AlC phase characteristic were depended on sintering temperature and graphene content. The compressive strength and fracture strain of TiAl-0.5G alloy were improved at room temperature and elevated temperature, which was improved by 23.61% and 5.03% compared to the TiAl-0G alloy at room temperature. The tribological properties of TiAl composites were significantly improved by micro-nano Ti2AlC at the room temperature, and the average friction coefficient of TiAl-0.5G alloy is 0.217 compared with TiAl-0G alloy is 0.312, and the wear mechanism is ploughing wear. The micro-nano Ti2AlC improves the strength and oxidation resistance of TiAl composites at 650 degrees C, which is detrimental to the wear resistance due to the lower ductility and the third wear by the loose oxide particles at elevated temperature.
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页数：10
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