Fig. 4: SEM images of the UAHP prepared Cu–Ti₃AlC₂ composites with different Ti3AlC2 content.
From: Ultrasonic-assisted hot-press sintering of Cu-Ti₃AlC₂ composites

a Cu-5 vol.% Ti₃AlC₂, b Cu-10 vol.% Ti₃AlC₂, c Cu-15 vol.% Ti₃AlC₂, d Cu-20 vol.% Ti₃AlC₂, e Cu-25 vol.% Ti₃AlC₂, f Cu-30 vol.% Ti₃AlC₂. The black colored phase is Cu matrix, while the red colored phase is Ti₃AlC₂.