Core/triple-shell precipitates in aluminum alloys
By engineering the alloy composition and heat-treatment, we create nanoscale core/triple-shell Al3(Er,Sc,Zr,V) precipitates through sequential nucleation of the solutes in an Al-0.004Er-0.042Sc-0.053Zr-0.074V (at.%) alloy. This atom-probe tomography reconstruction shows the precipitates after isochronal aging of the alloy to 425 °C, which is the strongest (peak-aged) condition. The Er-enriched core enhances strength while the Zr- and V-enriched outer shells improve thermal stability. The alloy maintains high strength at temperatures above 425 °C, which is 75% of the absolute melting point of aluminum.
Related publications
- Keith E Knipling, David C Dunand, and David N Seidman “Criteria for Developing Castable, Creep-Resistant Aluminum-Based Alloys — A Review” Z. Metallkunde 97 (3) pp. 246–265 (2006).
- Keith E Knipling, Richard A Karnesky, Constance P. Lee, David C Dunand, and David N Seidman “Precipitation Evolution in Al-0.1Sc, Al-0.1Zr, and Al-0.1Sc-0.1Zr (at.%) Alloys during Isochronal Aging” Acta. Mater. 58 (15) pp. 5184–5195 (2010).
- Keith E Knipling, David N Seidman, and David C Dunand “Ambient- and High-Temperature Mechanical Properties of Isochronally Aged Al-0.06Sc, Al-0.06Zr, and Al-0.06Sc-0.06Zr (at.%) Alloys” Acta. Mater. 59 (3) pp. 943–954 (2011).
Related publications
- Keith E Knipling, David C Dunand, and David N Seidman “Criteria for Developing Castable, Creep-Resistant Aluminum-Based Alloys — A Review” Z. Metallkunde 97 (3) pp. 246–265 (2006).
- Keith E Knipling, Richard A Karnesky, Constance P. Lee, David C Dunand, and David N Seidman “Precipitation Evolution in Al-0.1Sc, Al-0.1Zr, and Al-0.1Sc-0.1Zr (at.%) Alloys during Isochronal Aging” Acta. Mater. 58 (15) pp. 5184–5195 (2010).
- Keith E Knipling, David N Seidman, and David C Dunand “Ambient- and High-Temperature Mechanical Properties of Isochronally Aged Al-0.06Sc, Al-0.06Zr, and Al-0.06Sc-0.06Zr (at.%) Alloys” Acta. Mater. 59 (3) pp. 943–954 (2011).