Age Hardening Behavior and Corresponding Microstructure of Dilute Al-Er-Zr Alloys

作者：Huang H^*; Wen S P; Gao K Y; Wang W; Nie Z R

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2013, 44A(6): 2849-2856.

DOI：10.1007/s11661-012-1600-z

The age hardening and the microstructure of dilute Al-Er-Zr alloys were investigated by microhardness tests and TEM. The Al-0.04Er alloy shows a conventional age hardening behavior and obtains a maximum hardness of 410 MPa after aging for 2 h at 523 K (250 A degrees C) due to precipitation of Al3Er. The addition of Zr to Al-Er alloy can slow down the growth of the precipitates and make the age hardening effect remain for a long time in Al-0.04Er-0.04Zr alloy. Addition of Zr retards the decomposition of Al-Er and the Al-0.04Er-0.08Zr alloy can reach higher peak hardness than that of Al-0.04Er after aging for long time at elevated temperature. The precipitation behavior of Al-Er-Zr system is likely to be a new commercial way to developing creep-resistant aluminum alloy.

• 出版日期2013-6
• 单位北京工业大学