Research on Synthesis of High-Strength Aluminum Alloys
Annual rept. no. 1, 1 Jul 1971-31 Jul 1972
BATTELLE COLUMBUS DIV OH
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The objective of Task A is to provide increased strength and fracture resistance in aluminum alloys by optimizing the precipitate microstructure. To control the size and distribution of the intermediate precipitates in some high- strength 7000 and 2000 series alloys, several alloys were cast and their precipitate microstructures characterized by microscopy after homogenization treatments at various times and temperatures. Homogenization treatments were selected to produce a fine and a coarse intermediate precipitate. The objective of Task B is to develop a recrystallized microstructure in wrought high-strength aluminum alloys during hot working. Recrystallization occurred along the grain boundaries in the 2024 alloy only at the highest upset rate 8.8 inchsec and the highest temperature 925F. Preliminary microscopy results indicate that the intermediate precipitate in 2024 may not be stable during hot working.
- Properties of Metals and Alloys