Ductile phase toughening mechanisms in a TiAl-TiNb laminate composite

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Acta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90157-A· OSTI ID:7019284

Odette, G R; Chao, B L; Sheckherd, J W; Lucas, G E ^[1]

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1. California Univ., Santa Barbara, CA (United States)

In this paper, toughening mechanisms in a laminate composite composed of alternating layers of brittle [gamma]-TiAl and ductile TiNb reinforcements are studied. The TiNb phase comprising about 20% of the composite volume, contributed to toughening by both crack renucleation and bridging mechanisms, yielding a steep resistance curve and effective toughness more than ten times higher than the matrix value. In part, the extraordinary toughening is derived from large scale bridging effects, which occur when the size of the bridging zone s not small compared to the crack and specimen dimensions. Large scale bridging model predictions based on independent evaluations of the fundamental composite properties, including the reinforcement stress---displacement function, were in good agreement with the experimental observations. The authors demonstrate how the models can be used to optimize the composite properties for specific applications.

• OSTI ID: 7019284
• Journal Information: Acta Metallurgica; (United States), Journal Name: Acta Metallurgica; (United States) Vol. 40:9; ISSN 0001-6160; ISSN AMETAR
• 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
BRITTLENESS
COMPLEXES
COMPOSITE MATERIALS
DUCTILITY
HARDENING
LAYERS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NIOBIUM ALLOYS
OPTIMIZATION
PHASE STUDIES
REINFORCED MATERIALS
STRESSES
TENSILE PROPERTIES
TITANIUM ALLOYS