Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/75237
Title: Compositional and microstructural optimization and mechanical-property enhancement of cast Ti alloys based on Ti-6Al-4V alloy
Authors: Luan, JH
Jiao, ZB 
Liu, WH
Lu, ZP
Zhao, WX
Liu, CT
Keywords: Alloy design
Cast titanium alloy
Mechanical property
Microstructural optimization
Thermodynamic calculation
Issue Date: 2017
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2017, v. 704, p. 91-101 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: The effects of alloying additions on the microstructure and mechanical properties of cast Ti alloys based on Ti-6Al-4V were systematically investigated through a combination of thermodynamic calculations and experimental verifications. New cast titanium alloys with significantly improved properties were developed through combining thermodynamic calculations and physical metallurgy principles, which achieve an optimum combination of high strength and high ductility at both room and elevated temperatures. Our analysis indicates that the improved strength is due mainly to the α colony and lath size refinement induced by both macro- and micro-alloying of Cr, Fe, B and C elements, whereas the mechanisms for such property optimization include: (1) an increased volume fraction of ductile β phase in the cast state, (2) a refined α colony and lath size by the Cr, Fe, B and C alloying additions, and (3) an enhanced grain-boundary cohesion and refined grain size of prior-β grains induced by proper amount of B additions. The newly developed cast Ti alloys with substantially enhanced mechanical properties for engineering applications.
URI: http://hdl.handle.net/10397/75237
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2017.08.018
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