Accession Number:

ADA171917

Title:

The Effect of Thermomechanical Processing Variables on Ductility of a High - Mg, Al-Mg-Zr Alloy.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1986-06-01

Pagination or Media Count:

78.0

Abstract:

In previous research on thermomechanically processed high - Mg, Al - Mg alloys, yield strengths of 276 MPa 40 ksi were retained after simulated superplastic forming, but ductility at ambient temperature varied from one to fourteen percent elongation in tension testing. This variability in ductility was studied in a series of experiments conducted on an Al-10Mg-0.1Zr alloy. Study by light microscopy and scanning electron microscopy revealed defects resulting from inverse segregation in the original casting and also defects resulting from the relatively light reductions utilized in the warm rolling of the material. The use of heavier reductions in rolling was shown to improve tensile ductility at ambient temperature both in the as-rolled and annealed conditions. Superplasticity in material processed using such heavier reductions in rolling was then studied by tension testing at 300 C.

Subject Categories:

  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE