This study determined the independent effects of various homogenization cycles and
precipitation treatments on the elevated temperature workability and the final ambient
temperature mechanical properties of AA2024 aluminum alloy and on the T3 tensile
properties of 2014 aluminum alloy as well as T6 tensile properties of 2618 and 2618 (Curich)
aluminum alloys. The elevated-temperature tensile and extrusion tests indicate that the
workability of AA2024 alloy improves with elevated-temperature precipitation treatment as
suggested by earlier investigations. The precipitation treatments do not appear to degrade
the ambient-temperature T3 and T8 tensile properties. The time at the precipitation
temperature appears to affect the T3 and T8 tensile properties in unextruded ingot, longer
times especially providing both relatively high ambient-temperature strength and ductility of
AA2024 alloy. The time at the standard homogenization temperature and the heat-up and
cool-down rates do not dramatically affect the T3 tensile properties of unextruded ingot of
AA2024 and 2014 alloys. However, long soak times at the homogenization temperature
and more rapid cooling rates may improve the properties somewhat of AA2024 alloy and
longer heat-up times and rapid cooling rates may slightly improve the properties of 2014
alloy. The higher standard solution temperature appears to increase both strength and
ductility of 2014 alloy over lower temperatures. The homogenization temperature affects
the T6 tensile properties of 2618 and 2618 (Cu-rich) alloys, a high homogenization
temperature (compare to standard homogenization temperature) providing both high
strength and ductility. Increased manganese and copper appears to increase the strength,
but slightly decreases the ductility. The standard aging temperature and time produce
higher strength but lower the ductility than lower temperatures at the same or shorter aging
times in 2618 (Cu-rich) alloy. / Graduation date: 1993
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37053 |
| Date | 01 April 1993 |
| Creators | Li, Xiao, 1963- |
| Contributors | Kassner, M. E. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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