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← ScienceWhich outcome results from exceeding the spinodal decomposition limit in a metallic alloy during high-temperature phase transition?
A)Homogeneous nucleation and growth occurs
B)Metastable precipitate formation is suppressed
C)Compositional fluctuations spontaneously amplify✓
D)Equilibrium phase diagram becomes time-invariant
💡 Explanation
Exceeding the spinodal limit causes spontaneous compositional amplification because diffusion occurs down, rather than up, the concentration gradient. With spinodal decomposition, distinct phases separate without nucleation; therefore, it happens independent of prior precipitate behavior, and phase diagrams change with temperature.
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