Structure aspects of 1441 Al-Cu-Mg-Li alloy ingots according to solution heat treatment methods
The investigation of phase merging within 1441 Al-Cu-Mg-Li alloy ingots solution heat treatment was carried out. Raising temperature of solution heat treatment from 500 to 530°С causes almost complete nonequilibrium eutectic merge. 540°С, 24 h regime can cause partial melting of nonequilibrium eutectic on grain boundaries and ingot microporosity. Double-stage solution heat treatment of 1441 alloy with first stage at the 70-100°С lower point than the temperature of nonequilibrium solidus and high temperature second stage that is a little more than nonequilibrium solidus temperature allows reaching the most complete precipitation merge and raises material`s technical plasticity at the hot deformation temperature. The work within the framework of an integrated research area 8.1. «High-welded aluminum and aluminum-lithium alloys low density with high fracture toughness» («The strategic directions of development of materials and technologies of their processing them for the period till 2030»)