Journal
MATERIALS
Volume 15, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/ma15165766
Keywords
Ti2AlC/TiAl composite; homogenous architecture; microstructure; mechanical properties
Categories
Funding
- National Natural Science Foundation of China [52101174]
Ask authors/readers for more resources
The Ti2AlC/TiAl composite with a homogeneous architecture was fabricated using Ti/Al/GNSs composite powders. The few-layer graphene nanosheets were uniformly distributed in the composite powders through ultrasonic mechanical stirring. The composite exhibited high compressive properties and Vickers hardness, with enhanced toughness shown in fracture morphologies.
The Ti2AlC/TiAl composite with a homogenous architecture was fabricated via spark plasma sintering (SPS) using Ti/Al/GNSs composite powders, after ultrasonic mechanical stirring, as raw materials. The phases, microstructure, compressive properties and Vickers hardness of the composite were methodically characterized. We observed the transformation of graphene nanosheets from multi-layer to few-layer by the ultrasonic dispersion and the uniform distribution of few-layer graphene nanosheets in composite powders by ultrasonic mechanical stirring. The composite is mainly composed of rod-shaped Ti2AlC particles and a TiAl matrix, and the formation of rod-shaped morphology with the long axis along the (0001) plane is due to the fact that the growth rate of Ti2AlC parallel to the (0001) plane is much higher than the growth rate along the [0001] direction. The compressive stress and strain of the as-prepared Ti2AlC/TiAl composite reach 1451.2 MPa and 19.7%, respectively, which are better than some Ti2AlC/TiAl composites using graphite as the carbon source, and the Vickers hardness remains between 400 similar to 500 HV. The fracture morphologies show the deformation and fracture features of Ti2AlC particles, i.e., lamellae kinking and laminated tearing, which could increase the toughness of TiAl alloys.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available