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.
N1 - Funding Information:
Three of the authors (NC, CA, and JWJ) acknowledge Ford Motor Co. for financial support of this work. All authors acknowledge Dr. Warren Hunt, Jr., formerly of Alcoa Co., and currently of Aluminum Consultants Inc., for supplying the materials used in this study.
PY - 2000/3
Y1 - 2000/3
N2 - The effect of intermetallic inclusions on the fatigue crack initiation and growth in 2080 Al alloy and 2080/SiC p 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/20 p 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/30 p . 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/SiC p 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/20 p 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/30 p . 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/s11661-000-0037-y
DO - 10.1007/s11661-000-0037-y
M3 - Article
AN - SCOPUS:85017193114
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 - 3
ER -