Analysis of creep behavior of SiC/Al metal matrix composites based on a generalized shear-lag model

The creep behaviors of 20 vol% SiCw/2124Al, extruded with different ratios, and SiCp/2124Al, reinforced with 10-30 vol% SiC particles, were investigated to clarify the effects of aspect ratio, alignment, and volume fraction of reinforcement on creep deformation. The effective stresses on the matrix of SiC/Al composites are calculated based on the generalized shear-lag model. The minimum creep rates of SiCw/2124Al extruded with different ratios and SiCp/2124Al reinforced with different volume fractions of SiC particles are found to be similar under a same effective stress on matrix, which is calculated by the generalized shear-lag model. The subgrain sizes in matrices of crept SiC/Al composites are dependent on the effective stress on matrix but not on the applied stress on the composite. It is suggested that the role of SiC reinforcements is to increase the creep resistance of SiC/Al composite by reducing the effective stress on matrix.
Publisher
MATERIALS RESEARCH SOC
Issue Date
2004-12
Language
ENG
Keywords

HIGH-TEMPERATURE CREEP; PARTICULATE REINFORCED ALUMINUM; ELEVATED-TEMPERATURE; THRESHOLD STRESSES; STRENGTH

Citation

JOURNAL OF MATERIALS RESEARCH, v.19, no.12, pp.3633 - 3640

ISSN
0884-2914
DOI
10.1557/JMR.2004.0472
URI
http://hdl.handle.net/10203/941
Appears in Collection
MS-Journal Papers(저널논문)
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