The role of inclusion and pore content on the fracture toughness of powder-processed blended elemental titanium alloys

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02669613· OSTI ID:6136441

Moody, N R; Smugeresky, J E; Costa, J E ^[1]; Garrison, Jr, W M ^[2]

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1. Sandia National Lab., Livermore, CA (United States)
2. Carnegie Mellon Univ., Pittsburgh, PA (United States)

This study examined the effect of the inherent microstructural defects of inclusions and pores on the fracture toughness of powder-processed, blended elemental Ti-6AI-2Sn-4Zr-2Mo, Ti-6Al-4V, Ti-6Al-6V-2Sn, and Ti-10V-2Fe-3Al. These materials had been processed to contain either chloride inclusions or pores or a combination of both types of defects. The fracture toughness values for all of the samples were inversely dependent on the volume fraction of defects. These values also depended on defect type, with toughness values that were significantly higher in material containing only pores than in material containing inclusions or inclusions and pores. In all samples, fracture occurred by microvoid coalescence which initiated at these defects. Quantitative fractography and a ductile fracture toughness model were then combined to further define the relationship between defects, fracture mode, and fracture toughness. This approach showed that the smallest inclusions did not participate in the fracture process. Of the defects that did participate, the approach showed that both chloride inclusions and pores control fracture toughness in all alloys studied through their effects on defect spacing and the amount of void growth to failure. Furthermore, it demonstrated that the only alloy in which the pores and chloride inclusions combined to control fracture toughness was Ti-10V-2Fe-3Al.

• OSTI ID: 6136441
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 24:1; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHLORIDES
CHLORINE COMPOUNDS
DATA
DEFECTS
EXPERIMENTAL DATA
FRACTOGRAPHY
FRACTURE PROPERTIES
HALIDES
HALOGEN COMPOUNDS
INCLUSIONS
INFORMATION
IRON ALLOYS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
METALLURGY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NUMERICAL DATA
POROSITY
POWDER METALLURGY
TIN ALLOYS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
VOIDS
ZIRCONIUM ALLOYS