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The physical interpretation of the activation energy for hot deformation of Ni and Ni–30Cu alloys

Published online by Cambridge University Press:  17 March 2016

Amir Momeni
Amir Momeni*
Affiliation:
Materials Science and Engineering Department, Hamedan University of Technology, Hamedan 6516913733, Iran
*
a)Address all correspondence to this author. e-mail: ammomeni@aut.ac.ir
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Abstract

Hot compression tests on pure Ni and Ni–30Cu at 950–1150 °C and strain rates of 0.001–1 s−1 were performed to identify the physical interpretation of the apparent activation energy (Qd). For pure Ni, Qd was constant and identical to that of the self-diffusion. However, for Ni–30Cu, it decreased steadily with strain. The value of Qd was separated into thermal and mechanical parts. The thermal part was necessary to propel diffusion. For pure Ni, the mechanical part was zero at low and medium strain rates of 0.001–0.1 s−1 and the self-diffusion was the controlling mechanism. However, at 1 s−1, both the thermal and mechanical parts were needed to provide Qd. For Ni–30Cu, Qd was greater than that for the interdiffusion of Ni and Cu. The value of mechanical part decreased with increasing temperature and strain rate. Although the thermal parts for pure Ni and Ni–30Cu were nearly identical, the mechanical part for the latter was considerably higher. The difference was attributed to the strengthening effect of Cu atoms and the sluggish dynamic softening with respect to pure Ni.

Keywords

hot pressingstress/strain relationshipNi
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 8 , 28 April 2016 , pp. 1077 - 1084
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Copyright
Copyright © Materials Research Society 2016 

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References

REFERENCES

Lin, Y.C., Chen, M-S., and Zhong, J.: Constitutive modeling for elevated temperature flow behavior of 42CrMo steel. Comput. Mater. Sci. 42, 470 (2008).CrossRefGoogle Scholar
Ebrahimi, G.R., Momeni, A., Abbasi, S.M., and Monajatizadeh, H.: Constitutive analysis and processing map for hot working of a Ni–Cu alloy. Met. Mater. Int. 19, 11 (2013).CrossRefGoogle Scholar
Zhou, Y., Liu, Y., Zhou, X., Liu, C., Yu, L., Li, C., and Ning, B.: Processing maps and microstructural evolution of the type 347H austenitic heat-resistant stainless steel. J. Mater. Res. 30, 2090 (2015).CrossRefGoogle Scholar
Momeni, A., Abbasi, S.M., Morakabati, M., Badri, H., and Wang, X.: Dynamic recrystallization behavior and constitutive analysis of Incoloy 901 under hot working condition. Mater. Sci. Eng., A 615, 51 (2014).CrossRefGoogle Scholar
Zhang, C., Zhang, L., Li, M., Shen, W., and Gu, S.: Effects of microstructure and γ′ distribution on the hot deformation behavior for a powder metallurgy superalloy FGH96. J. Mater. Res. 29, 2799 (2014).CrossRefGoogle Scholar
Mehtonen, S.V., Karjalainen, L.P., and Porter, D.A.: Hot deformation behavior and microstructure evolution of a stabilized high-Cr ferritic stainless steel. Mater. Sci. Eng., A 571, 1 (2013).CrossRefGoogle Scholar
Verlinden, B., Driver, J., Samajdar, I., and Doherty, R.D.: Thermomechanical Processing of Metallic Materials, Cahn, R.W. ed. (Elsevier-Pergamon: London, 2007).Google Scholar
Momeni, A., Kazemi, S., Ebrahimi, G.R., and Maldar, A.: Dynamic recrystallization and precipitation in high manganese austenitic stainless steel during hot compression. Int. J. Miner., Metall. Mater. 21, 36 (2014).CrossRefGoogle Scholar
Chen, X.M., Lin, Y.C., Wen, D.X., Zhang, J.L., and He, M.: Dynamic recrystallization behavior of a typical nickel-based superalloy during hot deformation. Mater. Des. 57, 568 (2014).CrossRefGoogle Scholar
Mitsche, S., Sommitch, C., Huber, D., Stockinder, M., and Poelt, P.: Assessment of dynamic softening mechanisms in Allvac® 718Plus™ by EBSD analysis. Mater. Sci. Eng., A 528, 3754 (2011).CrossRefGoogle Scholar
Zhang, H., Zhang, K., Jiang, S., and Lu, Z.: The dynamic recrystallization evolution and kinetics of Ni–18.3Cr–6.4Co–5.9W–4Mo–2.19Al–1.16Ti superalloy during hot deformation. J. Mater. Res. 30, 1029 (2015).CrossRefGoogle Scholar
Hull, D. and Bacon, D.J.: Introduction to Dislocations, 4th ed. (Butterworth-Heinemann, London, 2001).Google Scholar
Shastry, V.V., Maji, B., Krishnan, M., and Ramamurty, U.: High-temperature deformation processing maps for a NiTiCu shape memory alloy. J. Mater. Res. 26, 2484 (2011).CrossRefGoogle Scholar
Abbasi, S.M., Momeni, A., Akhondzadeh, A., and Ghazi Mirsaed, S.M.: Microstructure and mechanical behavior of hot compressed Ti–6V–6Mo–6Fe–3Al. Mater. Sci. Eng., A 639, 21 (2015).CrossRefGoogle Scholar
Lin, Y.C., Chen, M-S., and Zhong, J.: Effect of temperature and strain rate on the compressive deformation behavior of 42CrMo steel. J. Mater. Process. Technol. 205, 308 (2008).CrossRefGoogle Scholar
Liu, N., Li, Z., Li, L., Liu, B., and Xu, G-Y.: Processing map and hot deformation mechanism of novel nickel-free white copper alloy. Trans. Nonferrous Met. Soc. China 24, 3492 (2014).CrossRefGoogle Scholar
Prasad, Y.V.R.K. and Sasidhara, S., eds.: Hot Working Guide, A Compendium of Processing Maps (ASM, Materials Park: Ohio, 1997).Google Scholar
Gandhi, G.: On fracture initiation mechanisms and dynamic recrystallization during hot deformation of pure nickel. Metall. Trans. A 13, 1233 (1982).CrossRefGoogle Scholar
Zheng, Q.G.: Characterization for dynamic recrystallization kinetics based on stress-strain curves. In Recent Developments in the Study of Recrystallization, Wilson, P., ed. (INTECH: Rijeka, Croatia, 2013); ch. 2. doi: 10.5772/54285.Google Scholar
Abbasi, S.M., Morakabati, M., Sheikhali, A.H., and Momeni, A.: Hot deformation behavior of beta titanium Ti-13V-11Cr-3Al alloy. Metall. Mater. Trans. A 45, 5201 (2014).CrossRefGoogle Scholar
Shakiba, M., Parson, N., and Chen, X-G.: Hot deformation behavior and rate-controlling mechanism in dilute Al–Fe–Si alloys with minor additions of Mn and Cu. Mater. Sci. Eng., A 636, 572 (2015).CrossRefGoogle Scholar
Neumann, G. and Tuijn, C.: Self-dissusion and Impurity Diffusion in Pure Metals: Handbook of Experimental Data (Elsevier-Pergamon, London, 2009).Google Scholar
Monma, K., Suto, H., and Oikawa, H.: Diffusion of Ni and Cu in nickel-copper alloys. Nippon Kinzoku Gakkaishi 28, 192 (1964).Google Scholar
Kocks, U.F., Argon, A.S., and Ashby, M.F.: Thermodynamics and kinetics of slip. Prog. Mater. Sci. 19, 1 (1975).Google Scholar
Abbasi, S.M. and Momeni, A.: Hot working behavior of Fe–29Ni–17Co analyzed by mechanical testing and processing map. Mater. Sci. Eng., A 552, 330 (2012).CrossRefGoogle Scholar
Shapiro, E. and Dieter, G.E.: Fracture and ductility in hot torsion of nickel. Metall. Trans. 2, 1385 (1971).Google Scholar