Compositional and microstructural optimization and mechanical-property enhancement of cast Ti alloys based on Ti-6Al-4V alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • J.H. Luan
  • Z.B. Jiao
  • W.H. Liu
  • Z.P. Lu
  • W.X. Zhao

Detail(s)

Original languageEnglish
Pages (from-to)91-101
Journal / PublicationMaterials Science and Engineering A
Volume704
Online published4 Aug 2017
Publication statusPublished - 17 Sep 2017

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.

Research Area(s)

  • Alloy design, Cast titanium alloy, Mechanical property, Microstructural optimization, Thermodynamic calculation

Citation Format(s)

Compositional and microstructural optimization and mechanical-property enhancement of cast Ti alloys based on Ti-6Al-4V alloy. / Luan, J.H.; Jiao, Z.B.; Liu, W.H.; Lu, Z.P.; Zhao, W.X.; Liu, C.T.

In: Materials Science and Engineering A, Vol. 704, 17.09.2017, p. 91-101.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal