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Authors' Reply K. BHANUMURTHY, G.B. KALE, and S.K. KHERA Singh and Lawley seem to have missed the objective of the communication which is mentioned in the introductory paragraph. We would also like to point out that the aim of the communication was not to comment on the different equilibrium intermetallic phases present in the zirconium-copper system but to identify the intermetallic phases formed in the diffusion zone, to evalute the incubation periods for their formation, and to present diffusion data on the chemical diffusion coefficients and the activation energies in these intermetallic phases. In the absence of any established phase diagram, we have referred to a recent phase diagram, m which shows the intermetallic phases CusZr, CuaZr(CusiZr14), Cu8Zr3, Cu2Zr , Cu24Zr13 , CUloZrT, C u Z r , Cu5Zr8, and CuZr2. Though the equilibrium phase diagram indicates several phases, the present study confirms the formation of only Cu4Zr and CuZr2 in the diffusion zone. This is not unexpected in view of the fact that equilibrium is not established in the diffusion zone as long as a concentration gradient across the phase interfaces exists. We admit that the equilibrium phases, namely, CusZr, CusZr3, and Cu2Zr (?), have been inadvertently omitted in our communication. However, this omission does not modify the conclusions drawn. The copper-rich phase formed in the diffusion zone is Cu4Zr and not CusZr, as has been confirmed from the composition estimated by electron probe microanalysis and also from X-ray diffraction studies. Singh and Lawley have pointed out that different equilibrium intermetallic compounds have been synthesized earlier. Our communication does not claim that Cu4Zr VOLUME 23A, DECEMBER 1992--3393
and CuZr2 are the only two intennetallic phases. We wou
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