Effects of Zr on the high strain rate superplasticity of 2124 Al

Journal Article · Sat May 01 04:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90020-S· OSTI ID:6520593

Nieh, T G; Wadsworth, J ^[1]

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1. Lawrence Livermore National Lab., CA (United States)

Many years ago, Nieh and Wadsworth, reported an observation that a 0.6wt%Zr-modified 2124 Al alloy, which has a fine grain size of about 1[mu]m, behaved superplastically at 475 C at high strain rates ([approximately] 10[sup [minus]1]s[sup [minus]1]). The present paper is an extension of the above study, demonstrating the effects of Zr additions to an Al alloy on superplastic strain rates. The deformation properties of a 2124 Al alloy containing 0.6wt%Zr have been characterized. As a result of the Zr addition, the alloy has a relatively fine grain size ([approximately] 1[mu]m). At relatively low strain rates (< 10[sup [minus]2]s[sup [minus]1]), the fine-grained 2124-0.6Zr alloy behaves like conventional coarse-grained alloys, i.e., it deforms by a dislocation climb mechanism at elevated temperatures (approximately 425-500 C). At high strain rates, however, the 2124-0.6Zr alloy exhibits superplasticity, similar to that observed in SiC whisker reinforced 2124 Al composites. The maximum tensile elongation is about 500%, recorded at 475 C, and at a strain rate of 3.3 [times] 10[sup [minus]1]s[sup [minus]1]. The high strain rate phenomenon is consistent with the general trend observed in aluminum-based alloys, namely, an increased strain rate for optimal superplastic flow with a decrease in grain size.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6520593
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Journal Issue: 9 Vol. 28:9; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals &amp; Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
CRYSTAL STRUCTURE
DATA
DEFORMATION
ELEMENTS
ELONGATION
EXPERIMENTAL DATA
GRAIN BOUNDARIES
GRAIN SIZE
INFORMATION
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
METALS
MICROSTRUCTURE
NUMERICAL DATA
PLASTICITY
SIZE
STRAIN RATE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENTS
ZIRCONIUM