High strain rate superplasticity of a powder metallurgy SiC particulate reinforced 6061 Al composite (6061/SiC/17. 5p)

Journal Article · Thu Dec 15 00:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90464-2· OSTI ID:6932131

Nieh, T G; Wadsworth, J ^[1]; Imai, T ^[2]; Kojima, S ^[3]

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1. Lawrence Livermore National Lab., CA (United States)
2. National Industrial Research Inst. of Nagoya (Japan)
3. Nagoya Municipal Industrial Research Inst. (Japan)

One of the major drawbacks of conventional superplastic forming is that the phenomenon is only found at relatively low strain rates, typically about 10[sup [minus]4] to 10[sup [minus]3] s[sup [minus]1]. Recent studies have demonstrated that superlasticity can exist at considerably higher strain rates than 10[sup [minus]3] s[sup [minus]1]. This high-strain-rate superplasticity (HSRS) phenomenon has now been observed principally in metal matrix composites and mechanically alloyed materials, but it has also been observed in more conventionally produced metallic alloys. Metal matrix composites can be fabricated by various techniques, e.g., squeeze casting, vortex methods, compocasting, powder metallurgical (PM) methods, and spray deposition. However, metal matrix composites that show HSRS are fabricated primarily by PM methods. Recently, Hikosaka et al. demonstrated that an ingot metallurgy (IM) 20 vol% SiC[sub p]-reinforced 6061 Al can also exhibit the HSRS phenomenon. The purpose of this study is to investigate the HSRS behavior of a SiC particulate-reinforced 6061 Al prepared by a powder metallurgy method and to compared its behavior with that of the composites produced by IM methods. The effect of thermomechanical processing and testing temperature will be discussed.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6932131
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 31:12; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
MICROSTRUCTURE
PLASTICITY
COMPOSITE MATERIALS
SILICON CARBIDES
COMPARATIVE EVALUATIONS
DUCTILITY
ELONGATION
EXPERIMENTAL DATA
TEMPERATURE DEPENDENCE
ALLOYS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
DATA
EVALUATION
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
NUMERICAL DATA
SILICON COMPOUNDS
TENSILE PROPERTIES
360602* - Other Materials- Structure & Phase Studies
360603 - Materials- Properties