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Materials 2017, 10(3), 308; doi:10.3390/ma10030308

Negative Temperature Dependence of Recrystallized Grain Size: Formulation and Experimental Confirmation on Copper

School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Academic Editor: Dinesh Agrawal
Received: 7 December 2016 / Revised: 21 February 2017 / Accepted: 10 March 2017 / Published: 21 March 2017
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Abstract

The catalyzing effect on nucleation of recrystallization from existing grains resulting from previous lower temperature deformation is analyzed, analogous to the size effect of foreign nucleus in heterogeneous nucleation. Analytical formulation of the effective nucleation site for recrystallization leads to a negative temperature dependence of recrystallized grain size of metals. Non-isochronal annealing—where annealing time is set just enough for the completion of recrystallization at different temperatures—is conducted on pure copper after severe plastic deformation. More homogeneous and smaller grains are obtained at higher annealing temperature. The good fit between analytical and experimental results unveils the intrinsic feature of this negative temperature dependence of recrystallized grain size. View Full-Text
Keywords: catalyzed nucleation; high angle grain boundary (HAGB); recrystallization; equal channel angular pressing (ECAP); negative temperature dependence catalyzed nucleation; high angle grain boundary (HAGB); recrystallization; equal channel angular pressing (ECAP); negative temperature dependence
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MDPI and ACS Style

Elmasry, M.; Liu, F.; Jiang, Y.; Mao, Z.N.; Liu, Y.; Wang, J.T. Negative Temperature Dependence of Recrystallized Grain Size: Formulation and Experimental Confirmation on Copper. Materials 2017, 10, 308.

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