Masters Theses

Date of Award

12-1989

Degree Type

Thesis

Degree Name

Master of Science

Major

Metallurgical Engineering

Major Professor

Charlie R. Brooks

Committee Members

Edward S. Clark, W. T. Becker

Abstract

The mechanical properties, microstructure, and texturing as a function of cold working and annealing in aluminum alloy 3104 have been examined. The material used in this research was heavy gauge (>0.150 in.) can stock in the hot rolled condition. A two hour annealing treatment at 332 °C (630 °F) was given in which the heat-up rate was 13 °C/hour (25 °F/hour). The material was then cold worked from 12% to 96% reduction. Annealing studies were conducted on 20%, 60%, and 88% cold work materials at six temperatures from 149 °C to 332 °C (300 °F to 630 °F) and for five times ranging from 1/8 hour to 32 hours.

The tensile mechanical properties, ultimate tensile strength, yield strength, and ductility, showed little variation with sample orientation in sheet samples. Therefore, the material is essentially isotropic (planar) with respect to these properties.

For reductions of 60% and 88%, recrystallization occurred at 316 °C (600 °F) in 1/4 hour. At 20% cold work, it occurred in 2 hours at 332 °C (630 °F).

During hot rolling, the material had not completely recrystallized and a high fraction cube texture was not present. The intermediate anneal prior to cold working completely recrystallized the material and produced a high cube texture.

Cold working reduced the high fraction of cube texture that was generated from the intermediate anneal. The material with less than 60% cold work showed 90° earing (cube texture) and greater than 60% showed 45° earing (rolling texture). A transition point between the cube and rolling texture was observed at 60% cold work, and no earing occurred.

During annealing, heat-up rates have an effect on the final texture. A fast heat-up anneal increased the cube texture in 20%, 60%, and 88% cold work material. The slow heat-up anneal increased the rolling texture in only the 60% cold work material while having little effect on the texture at 88% reduction.

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