期刊
ACTA MATERIALIA
卷 50, 期 16, 页码 4021-4035出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(02)00201-X
关键词
aluminum alloys; scandium; mechanical properties; precipitation strengthening; creep; threshold stress
Yield strength at ambient temperature and creep resistance between 225 and 300degreesC were investigated in dilute Al(Sc) alloys containing coherent Al3SC precipitates, which were grown by heat-treatments to radii in the range 1.4-9.6 nm. The dependence of the ambient-temperature yield stress on precipitate size is explained using classical precipitation strengthening theory, which predicts a transition from precipitate shearing to Orowan dislocation looping mechanisms at a precipitate radius of 2.1 nm, in good agreement with experimental data. At 300degreesC creep threshold stresses are observed and found to be much lower than the yield stresses, indicative of a climb-controlled bypass mechanism. The threshold stress increases with increasing precipitate radius, in qualitative agreement with a climb model taking into account stiffness and lattice mismatches between matrix and precipitates [1]. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
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