An investigation of cavitation in a mechanically alloyed 15 vol % SiCp/IN9021 aluminum composite

Conference · Thu Jul 01 04:00:00 EDT 1993

OSTI ID:10105442

Higashi, K; Okada, T; Mukai, T; Tanimura, S ^[1]; Nieh, T G; Wadsworth, J ^[2]

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1. Osaka Prefecture (Japan). Dept. of Mechanical Systems Engineering
2. Lawrence Livermore National Lab., CA (United States)

A mechanically alloyed 15 vol % SiCp/IN9021 aluminum composite exhibited a maximum elongation of 610 % at a very high strain of 5 s{sup {minus}1} at 823 K. Nonetheless, the maximum elongation was obtained at a lower strain rate than that where the maximum m value (about 0.5) was obtained. This discrepancy between the optimum superplastic strain rate for the largest elongation and the strain rate for the maximum m value was believed to be associated with the cavitation behavior. Cavitation behavior of the SiCp/IN9021 aluminum composite was, therefore, carried out. It was found that cavities initiated at ends of particulate reinforcements and parallel to the applied stress direction within initial small strains, and their subsequent growth and coalescence invariably leads to premature failure. Experimental results indicated that cavity growth is plasticity controlled and can be described by a model proposed by Stowell.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10105442
• Report Number(s): UCRL-JC--114736; CONF-9308122--16; ON: DE94003371
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603
ALUMINIUM ALLOYS
CAVITATION
CAVITIES
COMPOSITE MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PARTICLES
REINFORCED MATERIALS
SILICON CARBIDES
STRAIN RATE