Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992368 | Journal of Alloys and Compounds | 2018 | 13 Pages |
Abstract
The strength and precipitates after T8-aging (second-step aging at 170â¯Â°C following first-step aging at 150â¯Â°C for 4â¯h after 6% predeformation) and grain structures of 1445 Al-Li alloy (Al-1.7Li-1.5Cu-0.9Mg-0.1Mn-0.1Zr-0.1Ag-0.1Ti-0.08Sc-0.07Ni) cold-rolled sheet were investigated. The main precipitates are δⲠ(Al3Li) and Sâ² (Al2CuMg). It is critical that nano-sized Al3(Sc,Zr) dispersoids are formed, and the Cu-enriched and Sc-containing W phases (AlCuSc) are not found. Due to the strong pinning effect of the nano-sized Al3(Sc,Zr) dispersoids on sub-grain boundaries and dislocations, the solutionized 1445 Al-Li alloy sheet displays non-recrystallization characteristics, which corresponds to a high volume fraction of deformation textures of Copper {112}<111>, Brass {011}<211> and S {123}<634>. This non-recrystallization feature makes the 1445 Al-Li alloy suitable for thin sheet. In addition, due to the addition of minor Ni, Al9FeNi particles instead of Al7Cu2Fe particles are formed.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zhuo-wei Peng, Jin-feng Li, Feng-jian Sang, Yong-lai Chen, Xu-hu Zhang, Zi-qiao Zheng, Qing-lin Pan,