Effect of Indium on the precipitation process in Al-3.3Cu-0.7Li alloy

PAN Zheng-Rong; ZHENG Zi-Qiao; LIAO Zhong-Quan; LI Shi-Chen

doi:10.11890/1006-7191-104-285

Acta Metallurgica Sinica (English Letters) >

2010 , Vol. 23 >Issue 4: 285 - 292

DOI: https://doi.org/10.11890/1006-7191-104-285

Research paper

Effect of Indium on the precipitation process in Al-3.3Cu-0.7Li alloy

PAN Zheng-Rong ,
ZHENG Zi-Qiao ,
LIAO Zhong-Quan ,
LI Shi-Chen

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School of Materials Science and Engineering, Central South University, Changsha 410083, China

Received date: 2010-01-11

Revised date: 2010-04-20

Online published: 2010-08-11

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Abstract

The effects of 0.5 wt pct In on Al-3.3Cu-0.8Li alloy were studied. Instead of T1 (Al₂CuLi) phase, there was an unknown cubic phase acting as the dominant precipitates in the In-added alloy in T6 temper, which disappeared in T8 temper. The orientation relationship between this phase and matrix was given by SAEDs: (001)_p//(001)α, [010]_p//[010]_α. Both measuring directly from HREM images or calculating from it's FFTs gave an close lattice parameter about 0.83~nm. 3DAP composition analysis revealed the presence of Al, Cu and Li in the atomic percentages: 60%Al, 30%Cu and 10%Li. Thus, this cubic phase is considered to be Li-rich γ1 (Al₄Cu₉) phase or a new phase designated as χ (Al₅Cu₆Li₂). Different from the traditional report providing heterogeneous nucleation sites for the precipitates, In was detected neither around nor in the cubic phase by EDX and 3DAP.

Key words： Indium; Precipitation; Microstructure; HRTEM; 3DAP

Cite this article

PAN Zheng-Rong , ZHENG Zi-Qiao , LIAO Zhong-Quan , LI Shi-Chen . Effect of Indium on the precipitation process in Al-3.3Cu-0.7Li alloy[J]. Acta Metallurgica Sinica (English Letters), 2010 , 23(4) : 285 -292 . DOI: 10.11890/1006-7191-104-285

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