Al-Cu-Li-Zr-Ce-Sc alloy plate with ultrahigh strength and good plasticity and preparation method of Al-Cu-Li-Zr-Ce-Sc alloy plate

The invention discloses an Al-Cu-Li-Zr-Ce-Sc alloy plate with ultrahigh strength and good plasticity and a preparation method of the Al-Cu-Li-Zr-Ce-Sc alloy plate. The chemical components of the alloy are optimized by adding trace Ce and Sc elements on the basis of the components of the Weldalite049 aluminum-lithium alloy. A trace amount of Ce is added, so that the size of a coarse intermetallic compound phase AlCuZr in the alloy is refined, aggregated Ce atom vacancy clusters become heterogeneous nucleation points of an important strengthening phase T1 in the alloy, and the precipitation proportion and the volume fraction of the heterogeneous nucleation points are improved; al3 (Sc1-xZrx) dispersion particles formed by adding a trace amount of Sc make up the problem that the recrystallization inhibition capacity is insufficient due to the fact that Zr is independently added in the aluminum-lithium alloy, and the alloy grain structure is further refined. Through the synergistic effect of Ce, Sc and Zr microal