Modification of microstructure and properties of Ti-47Al-2Cr-4Nb-0.3W alloys fabricated by SPS with trace multilayer graphene addition

Journal Article · Sun Apr 15 04:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.01.036· OSTI ID:22804936

Zhou, Haitao ^[1]; Su, Yongjun ^[2]; Liu, Na; Kong, Fantao ^[1]; Wang, Xiaopeng; Zhang, Xi ^[3]; Chen, Yuyong ^[1]

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1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001 (China)
2. Department of Mechanics, College of Engineering, Lishui University, Lishui 323000 (China)
3. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001 (China)

Highlights: • The TiAl alloys with different content addition of multilayer graphene were fabricated. • When the graphene content is 0.8 at.%, the mean grain size decreases to 8.2 μm. • The bending and fracture strength increase to 1000 MPa and 2347 MPa, respectively. • The friction coefficient decreased from 0.6 to 0.4, with a decrease by 1/3. - Abstract: In this paper, Ti-47Al-2Cr-4Nb-0.3W alloys with trace multilayer graphene addition were fabricated by spark plasma sintering to enhance both mechanical properties and tribological property simultaneously. With the addition of multilayer graphene, bending strength, compressive strength and tribological property of TiAl alloys are all improved. When graphene content increases from zero to 0.8 at.%, the mean grain size decreases from 14.8 ± 1.4 μm to 8.2 ± 0.8 μm. The bending strength reaches almost 1000 MPa and the fracture strength increases to 2347 ± 12 MPa, an increase of 15% compared with TiAl alloy. The friction coefficient also decreases from about 0.6 to 0.4, a decrease by 1/3 compared with TiAl alloy. The reasons for the improved mechanical properties and tribological property are the in-situ reaction plate-shape Ti{sub 2}AlC phase, fine needle-like Ti{sub 3}AlC phase as well as fine and homogeneous microstructure. The wear mechanism changes from abrasive wear to abrasive wear plus adhesive wear with the increased graphene content.

• OSTI ID: 22804936
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 138; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
77 NANOSCIENCE AND NANOTECHNOLOGY
ALUMINIUM COMPOUNDS
CHROMIUM COMPOUNDS
COMPRESSION STRENGTH
FLEXURAL STRENGTH
FRACTURE PROPERTIES
FRICTION FACTOR
GRAPHENE
LAYERS
MICROSTRUCTURE
NIOBIUM COMPOUNDS
PRESSURE RANGE GIGA PA
TITANIUM COMPOUNDS
TUNGSTEN COMPOUNDS