Abstract
The effects of T6 and T6I6 ageing treatments on the hardness and intergranular corrosion properties of 6005A aluminum alloy were investigated using hardness test, intergranular corrosion (IGC) test, transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM) analysis. The results show that the hardness of the alloy in the T6 ageing treatment approaches a maximum value of 120 HV, however, it presents a severe intergranular corrosion with an average corrosion depth of 100 μm. The precipitates with small size are discontinuous at the grain boundaries. Fine precipitates with high density can be obtained in the grains after T6I6 aging treatment, and the precipitates are still discontinuous in the grain boundaries, however, the size of the precipitates is larger than that under T6 ageing treatment. The T6I6 ageing treatment for 6005A aluminum alloy not only increases the maximum hardness (127 HV), but also enhances the intergranular corrosion resistance, and the corrosion depth is only about 30 μm.
| Original language | English |
|---|---|
| Pages (from-to) | 1276-1282 |
| Number of pages | 7 |
| Journal | Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals |
| Volume | 22 |
| Issue number | 5 |
| State | Published - May 2012 |
| Externally published | Yes |
Keywords
- β″ precipitates
- 6005A aluminum alloy
- Aging treatment
- Corrosion