Influence of post-superplastic forming practices on the tensile properties of aluminium-lithium alloys

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Journal of Materials Engineering and Performance; (United States)

DOI:https://doi.org/10.1007/BF02645329· OSTI ID:6890596

Hales, S J ^[1]; Lippard, H E ^[2]

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1. Analytical Services and Materials, Inc., Hampton, VA (United States)
2. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science

The effect of thermal processing following superplastic forming on the tensile properties of aluminum-lithium alloys is addressed. The starting materials consisted of alloys 8090, 2090, and X2095 (a Weldalite[trademark] 049 variant) in the form of commercial-grade superplastic sheet. Experience dictates that post-forming practices aimed at a slightly underaged T6 temper produce balanced engineering properties in these alloys. The objective of this study was to assess the potential to use a T5-type temper by eliminating the solution heat treatment and/or cold water quenching steps characteristic of T6 processing. The experimental procedures adopted ensured that the tensile properties compiled were representative of the bulk material Initially, the strengthening behavior of each alloy as a function of temper selection was established. Subsequently, aging practices that resulted in peak strength and balanced properties were identified for the baseline T6 temper and two T5 tempers. The implications for replacing a T6 temper with a T5-type temper, including rapid and slow cooling following forming, are discussed on the basis of the results.

• OSTI ID: 6890596
• Journal Information: Journal of Materials Engineering and Performance; (United States), Vol. 3:3; ISSN 1059-9495
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
TEMPERING
TENSILE PROPERTIES
LITHIUM ALLOYS
AEROSPACE INDUSTRY
DEFORMATION
EXPERIMENTAL DATA
MATERIALS WORKING
WEIGHT
ALLOYS
ALUMINIUM ALLOYS
DATA
FABRICATION
HEAT TREATMENTS
INDUSTRY
INFORMATION
MECHANICAL PROPERTIES
NUMERICAL DATA
360103* - Metals & Alloys- Mechanical Properties
360101 - Metals & Alloys- Preparation & Fabrication