High strain rate superplasticity in metals and composites

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

OSTI ID:10189802

Nieh, T G; Wadsworth, J ^[1]; Higashi, K ^[2]

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

Superplastic behavior at very high strain rates (at or above 1 s{sup {minus}1}) in metallic-based materials is an area of increasing interest. The phenomenon has been observed quite extensively in metal alloys, metal-matrix composites (MMC), and mechanically-alloyed (MA) materials. In the present paper, experimental results on high strain rate behavior in 2124 Al-based materials, including Zr-modified 2124, SiC-reinforced 2124, MA 2124, and MA 2124 MMC, are presented. Except for the required fine grain size, details of the structural requirements of this phenomenon are not yet understood. Despite this, a systematic approach to produce high strain rate superplasticity (HSRS) in metallic materials is given in this paper. Evidences indicate that the presence of a liquid phase, or a low melting point region, at boundary interfaces is responsible for HSRS.

• 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: 10189802
• Report Number(s): UCRL-JC--114187; CONF-9308122--13; ON: DE94001521
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103
360603
ALUMINIUM BASE ALLOYS
COMPOSITE MATERIALS
GRAIN SIZE
MECHANICAL PROPERTIES
PLASTICITY
REINFORCED MATERIALS
SILICON CARBIDES
SILICON NITRIDES
STRAIN RATE
ZIRCONIUM ADDITIONS