Pre-strain-dependent natural ageing and its effect on subsequent artificial ageing of an Al-Cu-Li alloy
| Autor: | Qing Wang, Lihua Zhan, Hu Zhenggen, De-bo Liu, He Li, Chunhui Liu, Peipei Ma |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Precipitation (chemistry) Mechanical Engineering Alloy Metals and Alloys Analytical chemistry 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Precipitation hardening Mechanics of Materials Ageing Phase (matter) Materials Chemistry engineering Isostructural 0210 nano-technology Ductility |
| Zdroj: | Journal of Alloys and Compounds. 790:8-19 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2019.03.072 |
| Popis: | The effects of pre-strain and natural ageing (NA) on the precipitation hardening behavior in an Al-Cu-Li alloy have been systematically investigated. Applying pre-strain significantly restricts the solute clustering-induced formation of fine GPI zones (single Cu-layer) and thus hardness increase during NA. NA before artificial ageing (AA) has a marginally positive effect on the age hardening in samples without pre-strain, giving rise to a strength improvement of 15–20 MPa without loss of ductility. NA slightly enhances the precipitation of T1 phase during AA while shows no obvious effect on θ′, σ, δ′ and X phases. The X phase hasn't been reported and is isostructural to the θ′ phase, but the habit plane is (011)Al instead of (001)Al. With the increase of pre-strain level, the T1 plates become dominant and finer. However, NA after pre-strain has no appreciable effect on the age hardening and microstructure of the alloy. The analysis by complementary methods suggests that the low stability of NA clusters and their inhibition by pre-strain are responsible for the observed NA effect on AA in Al-Cu-Li alloy. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect