Sen, I and Ramamurty, U (2010) Mechanical Behavior of B Modified Ti-6Al-4V Alloys. In: Physics: Conference Series, pp. 745-748.
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Abstract
Small additions of B (typically less than ~0.4 wt.) to titanium alloys refine the as-cast microstructure significantly and hence improve their mechanical performance. In this work, tensile, fracture and fatigue properties of the as-cast and hot isostatically pressed Ti-6Al-4V alloy with 0, 0.05, 0.10 and 0.40 wt. B additions have been examined, with particular emphasis on identifying the microstructural length scale (grain size vs. lath size) that controls the mechanical properties of these alloys. Microstructural observations indicate a marked reduction in the prior β grain size, d, (by an order of magnitude) as well as the a lath size, λ, with the B addition. A one-to-one correspondence between d and λ, was found. Concomitant to the refinement in the microstructure, the yield and ultimate tensile strengths as well as the elastic modulus were observed to increase whereas the ductility and fracture toughness, KIC, decreases. Application of the Rice-Knott-Ritchie (RKR) model for quasi-brittle cleavage fracture indicates that the reduction in the KIC with increasing B content in the alloys is due primarily to the reduced λ. Fatigue crack growth measurements show a gradual reduction in threshold for fatigue crack initiation with λ0.5 dependence. © Ti-2007 - Proceedings of the 11th World Conference on Titanium. All Rights Reserved.
| Item Type: | Conference Proceedings |
|---|---|
| Publication: | Ti-2007 - Proceedings of the 11th World Conference on Titanium |
| Publisher: | Japan Institute of Metals (JIM) |
| Additional Information: | The copyright for this article belongs to Author. |
| Keywords: | Aluminum alloys; Brittle fracture; Ductile fracture; Fatigue crack propagation; Fracture toughness; Grain size and shape; Microstructure; Tensile strength; Ternary alloys; Vanadium alloys, reductions; Fatigue threshold; Fatigue threshold stress intensity factor range (�K0); Fracture toughness (KIC); Grainsize; K IC; Lath size; Mechanical behavior; Threshold stress intensity factor range; Titanium (alloys), Titanium alloys |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 04 Mar 2024 05:21 |
| Last Modified: | 04 Mar 2024 05:21 |
| URI: | https://eprints.iisc.ac.in/id/eprint/84101 |
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