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

Journal Article · Sat May 01 00:00:00 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), Vol. 28:9, Issue 9; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

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