Accession Number:

ADA199249

Title:

Thermal Mechanical Processing of Al-Li Alloy 2020 To Achieve Fine Grain Size

Descriptive Note:

Final rept.

Corporate Author:

NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHNOLOGY DEPT

Personal Author(s):

Report Date:

1987-10-01

Pagination or Media Count:

23.0

Abstract:

Aluminum lithium alloys are attractive as airframe materials because of their low density and high modulus of elasticity. However, these alloys suffer from poor fracture toughness and low ductility which limit their applicability. It is believed that the large constitutive particles and grain size exhibited by alloys such as 2020 aluminum are responsible for their low ductility and fracture toughness. Intermediate thermal mechanical processing ITMT involving heat treatment, cold work, and recrystallization was employed to refine the grain size of 2020 aluminum lithium plate. The grain size was successfully reduced from 400 microns to 10 microns. Future work will concentrate on the superplastic formability and fracture toughness of ITMT 2020 plate and new aluminum lithium alloys. Keywords Aluminum alloys, Lithium, Grain size, Thermal mechanical processing.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE