TY - JOUR
T1 - The interactive role of inclusions and SiC reinforcement on the high-cycle fatigue resistance of particle reinforced metal matrix composites
AU - Chawla, Nikhilesh
AU - Andres, C.
AU - Davis, L. C.
AU - Jones, J. W.
AU - Allison, J. E.
PY - 2000
Y1 - 2000
N2 - The effect of intermetallic inclusions on the fatigue crack initiation and growth in 2080 Al alloy and 2080/SiCp composites was investigated. Using surface replication, it was determined that, in the high-cycle fatigue region, life is dominated by the initiation process. It was also determined that the majority of initiation sites were associated with intermetallic inclusions. While 2080/SiC/20p showed a definitive relationship between inclusion size and fatigue life, i.e., a higher inclusion size resulted in lower fatigue life, there was no correlation in 2080/SiC/30p. This was attributed to more of the load being shared by the higher volume fraction of SiC particles and smaller average inclusion sizes in the latter composite. A conceptual model is proposed that accounts for these observations and qualitatively shows the effect of reinforcement on stress enhancement in near-surface inclusions.
AB - The effect of intermetallic inclusions on the fatigue crack initiation and growth in 2080 Al alloy and 2080/SiCp composites was investigated. Using surface replication, it was determined that, in the high-cycle fatigue region, life is dominated by the initiation process. It was also determined that the majority of initiation sites were associated with intermetallic inclusions. While 2080/SiC/20p showed a definitive relationship between inclusion size and fatigue life, i.e., a higher inclusion size resulted in lower fatigue life, there was no correlation in 2080/SiC/30p. This was attributed to more of the load being shared by the higher volume fraction of SiC particles and smaller average inclusion sizes in the latter composite. A conceptual model is proposed that accounts for these observations and qualitatively shows the effect of reinforcement on stress enhancement in near-surface inclusions.
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U2 - 10.1007/s11661-000-1013-2
DO - 10.1007/s11661-000-1013-2
M3 - Article
AN - SCOPUS:34548161681
SN - 1073-5623
VL - 31
SP - 951
EP - 957
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 13
ER -