Uneven Precipitation Behavior during the Solutionizing Course of Al-Cu-Mn Alloys and Their Contribution to High Temperature Strength

Figure 1

Optical microstructure of the studied alloys as-solutionized, showing PZs (precipitation zones), NPZs (no precipitation zones), and PFBs (precipitation-free bands): (a) A₁ alloy; (b) A₂ alloy; (c) A₃ alloy; (d) large magnification photo of the A₂ alloy.

(a)

(b)

(c)

(d)