Abstract
Discontinuous precipitation (DP) occurs in many alloy systems under certain conditions. Although solute supersaturation is the chemical driving force for DP, this has to be coupled with another driving force for grain boundary migration. This was identified to be diffusional coherency strain ahead of the moving boundary in the case of diffusion induced grain boundary migration (DIGM) and liquid film migration (LFM). In the present work, the validity of diffusional coherency strain hypothesis is verified in Mg-Al alloy, which exhibits discontinuous precipitation. Samples were tested with an applied stress simultaneously with discontinuous precipitation and it was found that the velocity of the boundaries both parallel and transverse to the stress axis obeys the model for diffusional coherency strain. This work can be used as a conclusive evidence for diffusional coherency strain hypothesis for the occurrence of discontinuous precipitation in Mg-Al alloys.
Similar content being viewed by others
References
Baik Y J and Yoon D N 1986Actamet. 34 2039
Baik Y J and Yoon D N 1987Actamet. 35 2265
Baluffi R W and Cahn J W 1981Actamet. 29 493
Chung Y H, Shin M C and Yoon D N 1992Actamet. 40 2177
Fournelle R A and Clark J B 1972Met. Trans. 3 2757
Hillert M 1972Met. Trans. 3 2729
Hillert M 1983Scr. Metall. 17 237
Hillert M and Purdy G R 1978Actamet. 26 333
Kashyap K T, Ramachandra C, Sujatha M and Chatterji B 2000Bull. Mater. Sci. 23 39
Sulonen M S 1960Actamet. 8 669
Sulonen M S 1964Actamet. 12 748
Yoon D N and Hupman W J 1981Actamet. 27 973
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kashyap, K.T., Ramachandra, C., Bhat, V. et al. A test for diffusional coherency strain hypothesis in the discontinuous precipitation in Mg-Al alloy. Bull Mater Sci 23, 295–299 (2000). https://doi.org/10.1007/BF02720085
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02720085