Effect of thermal processing practices on the properties of superplastic Al-Li alloys. Final report

Technical Report · Wed Sep 01 00:00:00 EDT 1993

OSTI ID:5447965

Hales, S J; Lippard, H E

The effect of thermal processing on the mechanical properties of superplastically formed structural components fabricated from three aluminum-lithium alloys was evaluated. The starting materials consisted of 8090, 2090, and X2095 (Weldalite(TM) 049), in the form of commercial-grade superplastic sheet. The experimental test matrix was designed to assess the impact on mechanical properties of eliminating solution heat treatment and/or cold water quenching from post-forming thermal processing. The extensive hardness and tensile property data compiled are presented as a function of aging temperature, superplastic strain and temper/quench rate for each alloy. The tensile properties of the materials following superplastic forming in two T5-type tempers are compared with the baseline T6 temper. The implications for simplifying thermal processing without degradation in properties are discussed on the basis of the results.

• Research Organization: Analytical Services and Materials, Inc., Hampton, VA (United States)
• OSTI ID: 5447965
• Report Number(s): N-94-14850; NASA-CR-4548; NAS-1.26:4548; CNN: NAS1-19399; RTOP 505-63-50-03
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
HEAT TREATMENTS
TENSILE PROPERTIES
LITHIUM ALLOYS
HARDNESS
PLASTICITY
PRECIPITATION HARDENING
PROGRESS REPORT
ALLOYS
ALUMINIUM ALLOYS
DOCUMENT TYPES
HARDENING
MECHANICAL PROPERTIES
360103* - Metals & Alloys- Mechanical Properties
360101 - Metals & Alloys- Preparation & Fabrication