New method for analyzing recrystallization kinetics of deformed metal by differential scanning calorimeter

Abstract

The drawn copper wires have been analyzed by differential scanning calorimeter (DSC) and a new method, which uses DSC measurements to determine the Johnson-Mehl-Avrami-Kolmogorov (JMAK) exponent via introducing Arrhenius behavior and modifying the baseline of DSC curves, has been proposed. The results show that JMAK exponent and recrystallization activation energy of the drawn copper wires with a strain of 2.77 are about 2.39 and 125 kJ/mol, respectively. The line linking the tangency points of DSC curve hypotenuse can be used as the baseline when calculating recrystallization fraction. The JMAK exponent obtained by the DSC method is in a good agreement with that obtained by microhardness measurements. Compared to traditional methods to measure the exponent, the proposed method is faster and less labor intensive.

Keywords

crystallization kinetics / differential scanning calorimeter / Johnson-Mehl-Avrami-Kolmogorov (JMAK) exponent / deformed metal

References

[1] LiuX, LiL-x, HeF-y, ZhouJ, ZhuB-w, ZhangL-qiang. Simulation on dynamic recrystallization behavior of AZ31 magnesium alloy using cellular automaton method coupling Laasraoui-Jonas model [J]. Transactions of Nonferrous Metals Society of China, 2013, 23: 2692-2699

[2] HeC N, ZhaoN Q, ShiC S, DuX W, LiJ J, LiH P, CuiQ R. An approach to obtaining homogeneously dispersed carbon nanotubes in Al powders for preparing reinforced Al-matrix composites [J]. Advanced Materials, 2007, 19: 1128-1132

[3] JohnsonW A, MehlR F. Reaction kinetics in processes of nucleation and growth [J]. Trans AIME, 1939, 135: 416-422

[4] AvramiM. Kinetics of phase change. I: General theory [J]. Journal of Physical Chemistry, 1939, 7: 1103-1112

[5] KolmogorovA N. A statistical theory for the recrystallization of metals [J]. Ivz Akad Nauk SSSR, Ser Mater, 1937, 3: 355-359

[6] LiuW C, YuanH, HuangM J, CaiD Y, YangQ X. Quantifying the recrystallization of cold rolled AA3015 aluminum alloy by X-ray diffraction [J]. Materials Science and Engineering A, 2009, 524: 168-175

[7] HeC N, TianF, LiuS J. A carbon nanotube/alumina network structure for fabricating alumina matrix composites [J]. Journal of Alloys and Compounds, 2009, 478: 816-819

[8] TanC L, HuangY W, TianX H, JiangJ X, CaiW. Origin of magnetic properties and martensitic transformation of Ni-Mn-In magnetic shape memory alloys [J]. Applied Physics Letters, 2012, 100: 132402-132405

[9] NurudeenA R, OlulekeO O. Recrystallization kinetics and microstructure evolution of annealed cold-drawn low-carbon steel [J]. Journal of Crystallization Process and Technology, 2013, 3: 163-169

[10] MotlaghS R, MaghsoudiM H, SerajzadehS. Softening behavior of alumina reinforced copper processed by equal channel angular pressing [J]. Materials Science and Technology, 2014, 30: 220-226

[11] TanC L, DongG F, GaoL, SuiJ H, GaoZ Y, CaiW. Microstructure, martensitic transformation and mechanical properties of Ni50Mn30Ga20−xCu_x ferromagnetic shape memory alloys [J]. Journal of Alloys and Compounds, 2012, 538: 1-4

[12] ChenJ, MaX-g, YanW, XiaF, FanX-hui. Effect of transverse grain boundary on microstructure, texture and mechanical properties of drawn copper wires [J]. Journal of Materials Science & Technology, 2014, 30: 185-91

[13] ChenJ, YanW, LiuC-x, DingR-g, FanX-hui. Dependence of texture evolution on initial orientation in drawn single crystal copper [J]. Materials Characterization, 2011, 62: 237-242

[14] ChenJ, YanW, LiW, MiaoJ, FanX-hui. Texture evolution and its simulation of cold drawing copper wires produced by continuous casting [J]. Transactions of Nonferrous Metals Society of China, 2011, 21: 152-158

[15] LutonM J, PetkovicR A, JonasJ J. Kinetics of recovery and recrystallization in polycrystalline copper [J]. Acta Metallurgica et Materialia, 1980, 28: 729-743

[16] MittemeijerE J. Analysis of the kinetics of phase transformations [J]. Journal of Materials Science, 1992, 27: 3977-3987

[17] KraftF F, WrightR N, JensenM K. Kinetics of Nonisothermal Recrystallization [J]. Journal of Materials Engineering and Performance, 1996, 5: 213-219

[18] ZhongS-hongTempering technology and equation of steel [M], 1993, Beijing, Machinery Industry Press: 157-158

[19] ContieriR J, ZanotelloM, CaramaR. Recrystallization and grain growth in highly cold worked CP-titanium [J]. Materials Science and Engineering A, 2010, 527: 3994-4000

[20] CaoW Q, GuC F, PerelomaE V, DaviesC H J. Stored energy, vacancies and thermal stability of ultra-fine grained copper [J]. Materials Science and Engineering A, 2008, 492: 74-79

[21] WangW, BrissetF, HelbertA L, SolasD, DrouelleI, MathonM H, BaudinT. Influence of stored energy on twin formation during primary recrystallization [J]. Materials Science and Engineering A, 2014, 589: 112-118

[22] HeC N, ZhaoN Q. One-step solid-phase synthesis of ultrasmall homogeneous face-centered tetragonal FePt nanoparticles encapsulated in thin carbon shells [J]. Journal of Material Chemistry, 2012, 22: 1297-1304

[23] HeC N, WuS, ZhaoN Q, ShiC S, LiuE Z, LiJ J. Carbon-encapsulated Fe3O4 nanoparticles as a high-rate lithium ion battery anode material [J]. ACS Nano, 2013, 7: 4459-4469

[24] HeC N, ChenL, ShiC S, ZhangC G, LiJ J, ZhaoN Q, WangX M, MakinoA, InoueA. Direct synthesis of amorphous carbon nanotubes on Fe₇₆Si₉B₁₀P₅ glassy alloy particles [J]. Journal of Alloys and Compounds, 2013, 581: 282-288

[25] BalluffiR W. On measurements of self-diffusion rates along dislocations in F.C.C. Metals [J]. Physica Status Solid B, 1970, 42: 11-34