Improvements in Strength and Electrical Conductivity in 7B04 Aluminum Alloy Pre-Stretched Thick Plates Via Low-Temperature Retrogression and Re-Ageing Heat Treatments
| Periodical | Materials Science Forum (Volumes 561 - 565) |
|---|---|
| Main Theme | PRICM 6 |
| Edited by | Young Won Chang, Nack J. Kim and Chong Soo Lee |
| Pages | 139-142 |
| DOI | 10.4028/www.scientific.net/MSF.561-565.139 |
| Citation | Zhi Hui Li et al., 2007, Materials Science Forum, 561-565, 139 |
| Online since | October, 2007 |
| Authors | Zhi Hui Li, Bai Qing Xiong, Yon Gan Zhang, Bao Hong Zhu, Feng Wang, Hong Wei Liu |
| Keywords | 7B04 Aluminum Alloy, Electrical Conductivity, Pre-Stretched Thick Plates, Reageing, Retrogression, Tensile Strength |
| Price | US$ 28,- |
The effect of RRA treatment with using low retrogression temperatures between 170°C to 190°C on the strength and electrical conductivity (as an indicator of corrosion resistance) of 7B04 aluminum alloy thick plates was investigated. The research results showed that the low-temperature RRA heat treatment provides a means for improving electrical conductivity of the aluminum alloy 7B04 pre-stretched thick plates without sacrificing the mechanical strength. The RRA temper with retrogression at 180°C for 60 min improved electrical conductivity remarkably (reached 21.0MS/m), with only a 3% reduction in strength below T6 temper. Furthermore, TEM observations showed that the microstructure of RRA treated alloy was a very fine distribution of η′ MgZn2 precipitates in the aluminum matrix, similar to T6 condition and η MgZn2 precipitates on grain boundaries distributed similarly to T73 temper.
