Deformation and strength characteristics of Laves phases in titanium alloys. (5th October 2019)

• Record Type: Journal Article
• Authors: Rabadia, C.D.; Liu, Y.J.; Chen, L.Y.; Jawed, S.F.; Wang, L.Q.; Sun, H.; Zhang, L.C.
• Is Part Of: Materials & design. Volume 179(2019)
• Publication Date: 2019-10-05
• Subjects: Titanium alloy -- Micro-indentation -- Laves phase -- Deformation -- Slip -- Dislocation; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2019.107891
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: The superior reinforcement nature of Laves phases make them suitable for high-strength applications. Therefore, investigations on the deformation and strength characteristics of Laves phases are useful in development of an improved Laves phase-reinforced alloy. In this work, the Vickers micro-indentation method is used to evaluate and compare the deformation and strength characteristics of a hexagonal close-packed Laves phase (C14-type) in Ti-35Zr-5Fe-6Mn (wt%) and a face-centered cubic Laves phase (C15-type) in Ti-33Zr-7Fe-4Cr (wt%), considering the same volume fraction of Laves phase (~7.0%) in these alloys. Moreover, the effects of higher volume fraction of Laves phase (19.4%) on indentation-based deformation features are evaluated in Ti-35Zr-5Fe-8Mn (wt%). Remarkably, dislocation activity and plastic deformation features are evident in the C15-type Laves phase, whereas the C14-type Laves phase strongly blocks dislocation motion. Therefore, the C15-type Laves phase improves plastic deformability, whereas the C14-type Laves phase improves strength characteristics of Laves phase-reinforced alloys. Graphical abstract: Unlabelled Image Highlights: Indentation-based deformation is affected by the type of Laves phase present in the microstructure. The C15-type Laves phase deforms better than the C14-type Laves phase. The C15-type Laves phase could contribute in enhancing bulk plasticity of the alloy. The C14-type Laves phase exhibits a better dislocation-pinning ability than the C15-type Laves phase.