Synergistic Balance of Strength and Corrosion Resistance in Al-Mg-Er Alloys

• 来源期刊: 金属学报（英文版）
• 年，卷（期）: 2020,（5）
• 页码范围: 659-670
• 页数: 12页
• 语种: 英文

摘要

High-strength,corrosion-resistant,and lightweight Al-Mg alloys perform an important function in harsh coastal service environments.Corrosion resistance is generally inversely correlated with strength;hence,it is difficult to simultaneously optimize both.In this study,a low-magnesium Er-containing Al-based alloy that is stronger and more corrosion resistant than Al-based alloys have been reported.The alloy contains Er,and the precipitation of Al3Er within a face-centered cubic matrix is obtained by a series of smelting-casting,heat treatment,and rolling processes.It is presumed that the strengthening phase of Al3Er pinning dislocations improves alloy strength.It also increases the recrystallization temperature of cold-rolled matrix and induces the distribution of small-angle grain boundaries,thus allowing the alloy to achieve excellent environmental corrosion resistance.As a result,strength and corrosion resistance are simultaneously improved.