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

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 °C) due to precipitation of Al 3 Er. The ad...

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Veröffentlicht in:	Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2013-06, Vol.44 (6), p.2849-2856
Hauptverfasser:	Huang, H., Wen, S. P., Gao, K. Y., Wang, W., Nie, Z. R.
Format:	Artikel
Sprache:	eng
Schlagworte:	Aluminum alloys Applied sciences Characterization and Evaluation of Materials Chemistry and Materials Science Exact sciences and technology Hardness testing Materials Science Metallic Materials Metallurgy Metals. Metallurgy Microstructure Nanotechnology Structural Materials Surfaces and Interfaces Thin Films
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Zusammenfassung:	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 °C) due to precipitation of Al 3 Er. 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.
ISSN:	1073-5623 1543-1940
DOI:	10.1007/s11661-012-1600-z