Retardation of intergranular fracture at intermediate temperatures by a boundary node in a Cu-9 at. % Al alloy tricrystal

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)00211-Y· OSTI ID:6823336

Onaka, Susumu; Tajima, Fumihiko; Hashimoto, Satoshi; Miura, Sei ^[1]

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1. Kyoto Univ. (Japan). Dept. of Engineering Physics and Mechanics

The effect of a boundary node on intergranular fracture at intermediate temperatures is discussed from creep tests employing a Cu-9 at.% Al alloy tricrystal. In situ observation to measure the amount of grain-boundary sliding is made during the creep tests. A temperatures between 773 and 923 K under an applied stress of 35 or 40 MPa, cracks to cause intergranular fracture appear in bicrystal and tricrystal specimens after the occurrence of a critical amount of grain-boundary sliding. The boundary node lowers the rate of the grain-boundary sliding and thereby retards the intergranular fracture. This is different from the effect of the boundary node at higher temperatures, where the boundary node becomes a preferential site for crack formation.

• OSTI ID: 6823336
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 43:1; ISSN 0956-7151; ISSN AMATEB
• 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
COPPER ALLOYS
COPPER BASE ALLOYS
CREEP
FRACTURE MECHANICS
GRAIN BOUNDARIES
IN-SITU PROCESSING
MECHANICAL PROPERTIES
MECHANICS
METALLURGICAL EFFECTS
MICROSTRUCTURE
PROCESSING