期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.08.017
关键词
Aluminum alloy; Precipitation; Yttrium; Al3Zr; Microstructure; Mechanical property
类别
资金
- State Key Development Program of Basic Research of China (973) [2012CB619505]
- National Natural Science Foundation of China [51274141]
Microstructure and mechanical property of Al-0.30Zr, Al-0.30Zr-0.08Y and Al-0.30Zr-0.16Y (wt%) alloys were investigated. Minor addition of Y refines the grain size and forms the eutectic Al3Y phase particles within grains and at grain boundaries in as-cast Al-Zr-Y alloys. The increase of Y additions results in larger amount and particle size of Al3Y in Al-Zr-Y. The decomposition of solid solution leads to a high number density of secondary Ll(2)-structured Al-3(Zr,Y) precipitates within dendritic regions in Al-Zr-Y during isothermal aging at 450 degrees C. The precipitate-free regions in grains and adjacent to grain boundaries in Al-Zr-Y alloys are narrower than that in Al-Zr. The mechanical property of Al-Zr alloys gets improved with increasing Y-content. The Al-0.30Zr-0.08Y alloys show improved recrystallization resistance compared with Al-0.30Zr. However, excess Y-addition, e.g. 0.16%, is detrimental to the recrystallization resistance of Al-Zr alloys due to the particle simulate nucleation (PSN) induced by micron-sized Al3Y phase. (C) 2014 Elsevier B.V. All rights reserved.
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