Metallurgical Engineering > GATE 2025 > Heat Treatment
Which of the following statements is/are CORRECT with respect to the initial stage of GP zone formation in a precipitation hardenable Al - 4.5 wt.% Cu alloy?
A
GP zones are Cu-rich clusters.
B
GP zones are CuAl2 precipitates.
C
GP zones are incoherent with the matrix.
D
GP zones are coherent with the matrix.

Correct : a

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