Crack growth in a ductile-phase-toughened Nb/Nb[sub 3]Al in situ intermetallic composite under monotonic and cyclic loading

Journal Article · Fri Oct 15 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90186-V· OSTI ID:6096070

Murugesh, L; Venkateswara Rao, K T; Ritchie, R O ^[1]

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1. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering

One approach to improving the ductility and toughness of brittle solids is to incorporate a ductile phase into the brittle matrix in order to impede the extension of incipient cracks. In this regard, recent word has shown that niobium can provide significant ductile-phase toughening in several intermetallic composites via crack bridging, plastic stretching and interfacial debonding mechanisms; however, under cyclic loading the role of the ductile phase appears to be less effective. Accordingly, the purpose of the current study is to examine the effect of the addition of ductile Nb phase on fracture and fatigue behavior in an equiaxed Nb/Nb[sub 3]Al in situ composite; results are compared with behavior in unreinforced Nb[sub 3]Al and Nb to determine possible mechanisms of crack propagation in Nb-toughened Nb[sub 3]Al intermetallic composites.

• OSTI ID: 6096070
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 29:8; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
CRACK PROPAGATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DUCTILITY
ELEMENTS
INTERMETALLIC COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
NIOBIUM
NIOBIUM ALLOYS
TENSILE PROPERTIES
TRANSITION ELEMENTS