Journal
JOURNAL OF MATERIALS RESEARCH
Volume 31, Issue 2, Pages 250-258Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/jmr.2015.408
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Funding
- National Natural Science Foundation of China [51404153]
- Shanghai Yang-fan Program [14YF1402000]
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The effect of 0.5 wt% Mn addition on the microstructure and mechanical properties of cast Al-2Li-2Cu-0.8Mg-0.4Zn-0.2Zr (wt%) alloy was investigated. Results showed that the grain size of Mn-containing alloy was smaller than that of Mn-free alloy in both the as-cast and solution treated state. Al20Mn3Cu2 dispersoids were formed during solution treatment in the Mn-containing alloy. After aging at 175 degrees C for 32 h, a large volume fraction of coherent Al3Li/Al-3(Li, Zr) particles were precipitated in both Mn-free and Mn-containing alloys, while more Guinier-Preston-Bagaratsky zones were observed in the Mn-free alloy. Mn addition improved the elongation significantly, which was 1.7% for Mn-free alloy and 3.3% for the alloy with 0.5 wt% Mn addition.
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