CALPHAD Approach and processing of a multicomponent titanium matrix composite for high strength and fracture toughness

The high temperature phase fields of a multicomponent titanium alloy system have been determined by the CALPHAD approach to assist in rapid processing of a titanium metal matrix composite by electric-field-assisted reaction sintering. The phase field calculations revealed the existence of a wide com...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2020-04, Vol.781, p.1-6, Article 139210
Main Authors: Degnah, A., Du, J., Ravi Chandran, K.S.
Format: Article
Language:English
Subjects:
Activated sintering
Alloy systems
Aluminum
CALPHAD
Composite
Computer simulation
Electric fields
Flexural strength
Fracture toughness
High temperature
Iron
Metal matrix composites
Molybdenum
Strength
Titanium
Titanium alloys
Titanium base alloys
Titanium diboride
Toughness
Whiskers (metals)
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Summary:The high temperature phase fields of a multicomponent titanium alloy system have been determined by the CALPHAD approach to assist in rapid processing of a titanium metal matrix composite by electric-field-assisted reaction sintering. The phase field calculations revealed the existence of a wide composition range (in terms of B, Fe, Mo and Al content) for the flexible synthesis of various β-Ti-TiB composites. After processing, the uniform dispersion of in-situ formed titanium boride (TiB) whiskers, in the ductile beta titanium (β-Ti) matrix, has resulted in a composite with a flexural strength of 1622 MPa and a fracture toughness of 23 MPa m, which are much greater than the levels achieved before in this class of materials.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2020.139210