Two-stage Hall-Petch relationship in Cu with recrystallized structure
Y.Z. Tiana,*(), Y.P. Renb, S. Gaoc,d, R.X. Zhenge, J.H. Wangf, H.C. Pana, Z.F. Zhangg,h, N.T sujic,d, G.W. Qinb

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Fig. 3.. Plots of yield strength against the inverse square root of grain size for pure Cu and Cu7Ag alloy. The reported Hall-Petch relationship is indicated by the broken line.