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Figure 2 shows a 7'-Ag2Al precipitate embedded in an FCC-Al matrix. 7-Ag2Al has an HCP crystal structure with lattice parameters a = 2.89 and c
Figure 2 shows a 7'-Ag2Al precipitate embedded in an FCC-Al matrix. 7-Ag2Al has an HCP crystal structure with lattice parameters a = 2.89 and c = 4.60 . The lattice parameter of FCC Al is a = 4.05 . The {0001} plane of y' is parallel to the {111} plane of the Al matrix. (a) (10 marks) Briefly describe the differences between coherent and semi-coherent in- terfaces. Classify the interface type for interface A and B shown in Fig. 2. (b) (5 marks) Which interface do you expect to have higher interfacial energy? Briefly explain your answer. (c) (5 marks) Which interface do you expect to move faster during precipitate growth? Briefly explain your answer. Interface B (a) FCC-A1 Type- [{111}FCC {0001}HCP Interface A A Ag,Al FCC HCP * * 2 nm Figure 2: HCP 7-Ag2Al precipitate embedded in an FCC-Al matrix
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