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The method of calculating the invariant line in HCP→BCC precipitation based on the invariant line strain model is described.The experimentally determined crystallographic features of the lath-shaped or needle-like precipitates formed in the HCP→BCC precipitations occurring in Mg-Al and Zr-Nb alloys were found to be in excellent agreement with the predictions from the model,thus suggesting that the model is valid for predicting the crystallography of diffusion-controlled phase transformations.