THE INFLUENCE OF MICROSTRUCTURE ON THE FRACTURE TOPOGRAPHY OF TITANIUM ALLOYS
BOEING COMMERCIAL AIRPLANE CO RENTON WA
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A survey is presented of the fracture topography observed in titanium and titanium alloys. Ductile fracture by microvoid nucleation, growth, and coalescence is of widespread occurrence in these alloys. It is usually possible to qualitatively relate the dimple size to the macroscopic ductility of the alloy. Titanium alloys may be embrittled by alloying additions that, in most cases, lead to a fine dispersion of second-phase particles. In alpha-phase alloys, this brittleness is associated with cleavage fracture. However, beta-phase alloys, which exhibit cleavage-like macroscopic behavior, show evidence of small dimples when observed using a microscope. Environment often dramatically affects the fracture behavior of titanium alloys, producing low-energy cleavage-like failures in alpha and beta phases, which are normally ductile.
- Properties of Metals and Alloys