Effects of Sc and Zr microalloying on the microstructure and mechanical properties of high Cu content 7xxx Al alloy

Review on Micro-Alloying and Preparation Method of 7xxx Series Aluminum Alloys: Progresses and Prospects

“…The morphologies of 7055 and 7055-0.25Sc ingots after homogenization are shown in Figure 19 [ 87 ]. The energy dispersive X-ray spectroscopy (EDS) spectrum of particle A, Figure 12 a shows that the particle is in the θ phase.…”

Research Status and Prospective Properties of the Al-Zn-Mg-Cu Series Aluminum Alloys

“…But in Al-Zn-Mg-Cu alloy with high Cu content, Sc atoms diffused to θ-Al 2 Cu phase, which promoted the formation of w-AlCuSc phase [62]. When the total mass fraction of Sc and Zr exceeded 0.45% (mass fraction), large w phase and coarse primary Al 3 (Sc,Zr) phase were formed, leading to the degradation of mechanical properties of the alloy (Table 2) [63]. Sm could effectively reduce the distance between secondary dendrite arms and was a good thinning element of aluminum alloy.…”

“…Tensile properties of 7055-xZr-ySc alloy after rolling and T6 aging (Reprinted with permission from Ref [63]…”

Newer Developments in Aluminium Alloys Through Ordered Precipitates and Segregation of Transition Elements

“…In contrast, Cu has a limited effect on Sc solubility. The ageing at higher temperatures ([ 260 °C) forms W-phase (Al 8-x-Cu 4?x Sc) and is considered detrimental for tensile properties [35,36]. The Al 3 Sc precipitates are formed during ageing between 200 and 400 °C, whereas h' plates nucleate below 200 °C.…”