TY - JOUR
T1 - Improved resistance to stress-corrosion-cracking failures via optimized retrogression and reaging of 7075-T6 aluminum sheets
AU - Baydogan, Murat
AU - Cimenoglu, Huseyin
AU - Sabri Kayali, E.
AU - Rasty, Jahan
PY - 2008/10
Y1 - 2008/10
N2 - The effect of retrogression and reaging (RRA) treatment on the hardness and stress corrosion cracking (SCC) susceptibility of 7075 aluminum alloy sheets was systematically investigated. The material in its as-received T6-temper state was retrogressed at 170 °C, 220 °C, 240 °C, and 380 °C for different durations between 15 seconds and 60 minutes. Subsequent reaging was performed at the T6 aging condition (120 °C for 24 hours). RRA-treated alloys exhibited a better combination of hardness and SCC resistance than the T6-temper state when retrogressed between 170 °C and 240 °C for short durations. However, a retrogression temperature of 380 °C resulted in considerable reduction in both hardness and SCC resistance. Among retrogression temperatures employed, 170 °C provided an optimum combination of hardness and SCC resistance, corresponding to 20 pct improvement in hardness and 85 pct improvement in SCC resistance. In this article, improvements in hardness and SCC resistance of 7075 alloy upon RRA treatment are discussed.
AB - The effect of retrogression and reaging (RRA) treatment on the hardness and stress corrosion cracking (SCC) susceptibility of 7075 aluminum alloy sheets was systematically investigated. The material in its as-received T6-temper state was retrogressed at 170 °C, 220 °C, 240 °C, and 380 °C for different durations between 15 seconds and 60 minutes. Subsequent reaging was performed at the T6 aging condition (120 °C for 24 hours). RRA-treated alloys exhibited a better combination of hardness and SCC resistance than the T6-temper state when retrogressed between 170 °C and 240 °C for short durations. However, a retrogression temperature of 380 °C resulted in considerable reduction in both hardness and SCC resistance. Among retrogression temperatures employed, 170 °C provided an optimum combination of hardness and SCC resistance, corresponding to 20 pct improvement in hardness and 85 pct improvement in SCC resistance. In this article, improvements in hardness and SCC resistance of 7075 alloy upon RRA treatment are discussed.
UR - http://www.scopus.com/inward/record.url?scp=50349089515&partnerID=8YFLogxK
U2 - 10.1007/s11661-008-9595-1
DO - 10.1007/s11661-008-9595-1
M3 - Article
AN - SCOPUS:50349089515
SN - 1073-5623
VL - 39
SP - 2470
EP - 2476
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 10
ER -