Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 639, Issue -, Pages 307-313Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.05.027
Keywords
Aluminum alloy; Precipitation; Erbium; Hafnium; Zirconium; Recrystallization
Categories
Funding
- National Key Basic Research & Development Plan Project [2012CB619503]
- National and Beijing Natural Science Foundation [51201003, 2142007]
- National High Technology Research and Development Program [2013AA031301]
- International Science & Technology Cooperation Program of China [2013DFB50170]
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A study on the precipitation hardening and recrystallization behavior of dilute Al-Er-Hf and Al-Er-Hf-Zr alloys has been carried out. The results show that both Al-0.045Er-0.18Hf and Al-0.045Er-0.08Zr-0.1Hf alloys can obtain remarkable age strengthening effect and recrystallization resistance. The precipitation hardening rate of Al-0.045Er-0.08Zr-0.T1 Hf is accelerated compared with that of the Al-0.045Er-0.18Hf alloy due to substituting 0.08 at% Zr for Hf, which can be ascribed to the sequential precipitation of solute elements on the basis of the disparity in their intrinsic diffusivities (D-Er > D-Zr > D-Hf). The peak hardness values for the Al-0.045Er-0.08Zr-0.1Hf are 644 MPa and 662 MPa after isochronal aging to 450 degrees C and isothermal aging at 350 degrees C for 84 h, respectively, which are higher than those of the Al-0.045Er-0.18Hf alloy. The recrystallization temperature of Al-Er-Hf-Zr alloy is 450 degrees C, about 25 degrees C higher than that of the Al-Er-Hf alloy due to the larger f/r ratio of precipitates in Al-Er-Hf-Zr alloys. (C) 2015 Elsevier B.V. All rights reserved,
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