Creep of dispersion strengthened alloys controlled by jog nucleation

Journal Article · Mon Jul 01 00:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00383-5· OSTI ID:264097

Pichler, A ^[1]; Arzt, E ^[2]

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1. Voest Alpine Stahl Linz GmbH (Austria)
2. Univ. of Stuttgart (Germany)

The creep behavior of dispersion strengthened materials is generally characterized by unusually high activation energies and stress exponents. In this paper the authors propose a model in which jog nucleation in the particle-matrix interface is assumed to control dislocation climb and, thus, the creep rate. This approach results in a new creep equation without adjustable parameters which reproduces the high stress exponents and activation energies. Experimental creep data for Al alloys can be described just as well as by the earlier ``detachment model.`` Because of the different physical basis, new implications for alloy design may be expected.

• OSTI ID: 264097
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 7 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ALLOYS
CREEP
DESIGN
DISLOCATIONS
DISPERSION HARDENING
INTERFACES
MATRIX MATERIALS
NUCLEATION
PARTICLES
STRESSES