Size effect in the Al3Sc dispersoid-mediated precipitation and mechanical/electrical properties of Al-Mg-Si-Sc alloys

A significant size effect is found in the Al3Sc dispersoid-mediated precipitation in an Al-Mg-Si-Sc alloy. When the Al3Sc dispersoid size smaller than about 40 nm, β″ precipitates nucleate directly on the coherent dispersoids and grow by sacrificing the latter. While the dispersoid size greater than...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 57; pp. 78 - 84
Main Authors Wang, Ruihong, Jiang, Shengyu, Chen, Bao’an, Zhu, Zhixiang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.11.2020
Subjects
Al-Mg-Si-Sc alloy
Al3Sc dispersoids
Hardness and conductivity
Precipitation
Size effect
Al-Mg-Si-Sc alloy
Precipitation
Al3Sc dispersoids
Size effect
Hardness and conductivity
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Summary:A significant size effect is found in the Al3Sc dispersoid-mediated precipitation in an Al-Mg-Si-Sc alloy. When the Al3Sc dispersoid size smaller than about 40 nm, β″ precipitates nucleate directly on the coherent dispersoids and grow by sacrificing the latter. While the dispersoid size greater than ∼ 40 nm, Q' and U2 phases are additionally produced that nucleate on the dislocations induced by the semi-/incoherent dispersoids. Mechanical and electrical properties are highly sensitive to the Al3Sc dispersoid-tuned precipitation. The co-precipitation of β″, Q' and U2 phases leads to an obvious improvement in hardness and simultaneously in electrical conductivity.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2020.03.056