Superplasticity and Deformation Mechanism of LD10 Aluminium Alloy
| Periodical | Materials Science Forum (Volumes 475 - 479) |
|---|---|
| Main Theme | PRICM-5 |
| Edited by | Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie |
| Pages | 2941-2944 |
| DOI | 10.4028/www.scientific.net/MSF.475-479.2941 |
| Citation | Hong Zhen Guo et al., 2005, Materials Science Forum, 475-479, 2941 |
| Online since | January, 2005 |
| Authors | Hong Zhen Guo, Chunyan Duan, Ze Kun Yao, Wei Zhang |
| Keywords | Dynamic Recrystallization (DRX), LD10 Aluminium Alloy, Metal Filaments, Pre-Treatment, Superplasticity |
| Price | US$ 28,- |
The commercial hot-rolled bars of LD10 alloy (grain size 25~75µm) are pretreated via proper recrystallization annealing (temperature 380°C, 420°C and 460°C) and solution annealing (temperature 500°C). The average elongation is increased from 158% to 270%, 223%, 219% and 233% respectively and the maximum elongation is 321% (500°C, 3.3×10-4s-1). The test results show that the alloy can present certain superplasticity owing to structural effect of dynamic recrystallization refining during superplastic deformation of coarse-grained LD10 alloy. Large and deep cavities form in grain boundaries and result in intergranular fracture after larger superplastic tensile deformation. And a large amount of metal filaments appear on grain surfaces. The formation of filaments is attributed to viscous flow of solid-liquid mixture in grain boundaries caused by grain-boundary sliding. The appearance of solid-liquid mixture makes grain-boundary sliding easier.
