ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 10

Deformation of Aluminum Alloy under Cyclic Creep Loadings

Gong, ZL
Graduate Research Assistant, and Professor and Head, University of Manitoba, Winnipeg, Manitoba

Hsu, TR
Graduate Research Assistant, and Professor and Head, University of Manitoba, Winnipeg, Manitoba

(Received 18 December 1989; accepted 10 May 1990)

Abstract

Cyclic creep tests were conducted on an aluminum alloy at 160 and 200°C. Measured results indicated that mechanical load cycling with long dwell periods can produce significant creep acceleration. Such creep acceleration not only resulted in the increasing of minimum strain rate at subsequent loading cycles, but also reduced the creep rupture life of the material. Microstructure examinations by TEM and SEM were carried out to study microstructural damages under monotonic and cyclic loadings. Results indicated that remobilization of dislocation and damage enhancement during stress cycling were chiefly responsible for creep acceleration.

Keywords:
creep, cyclic, acceleration, dwell time

Paper ID: JTE12524J
DOI: 10.1520/JTE12524J
ASTM International is a member of CrossRef.