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

• 作者: Ruihong Wang Shengyu Jiang Bao'an Chen Zhixiang Zhu
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（22）
• 页码范围: 78-84
• 页数: 7页
• 语种: 英文

摘要

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 coher-ent 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 pre-cipitation.The co-precipitation of β",Q'and U2 phases leads to an obvious improvement in hardness and simultaneously in electrical conductivity.