Volume 2, Issue 4, August 2013, Page: 53-58
Changes in Internal Structure of Bronze and Iron over Time at Ambient Temperature
Jaroslav Fiala, New Technologies - Research Centre in Westbohemian Region, Plzen, Czech Republic
Jaroslav Pavelka, University of West Bohemia, Plzen, Czech Republic
Jiří Kříž, University of West Bohemia, Plzen, Czech Republic
Martin Hložek, Centre for Archaeological Research of Social, Structures from Primeval to Middle Ages, Masaryk University, Brno, Czech Republic
Pavel Hušťák, Pueblo – archeologická společnost, o.p.s. Pueblo (Archaeology Company Pueblo), Podjavorinské 1601/8, Praha, Czech Republic
Received: Jul. 6, 2013;       Published: Aug. 20, 2013
DOI: 10.11648/j.am.20130204.12      View  3132      Downloads  152
This study analyzes changes in the inner structure of metals (bronze and iron) resulting from aging and creeping processes. A remarkable disproportion was noticed during hardness analyses of original metal objects from archaeological finds and replicas likely made in the same way as the originals. The mechanism of such long-term changes at ambient temperature remain unknown. We examined the azimuthal (lateral) diffraction line profile, which includes the size, number and shape of individual diffraction spots comprising a discontinuous diffraction line. By x-ray analysis, all of the original bronze and iron artifacts were proven coarse–grained; coherent areas (mosaic blocks) were larger than 10 μm. The original structure of objects produced by the forging of sponge iron must have been much more fine–grained. The measurements revealed that the mechanism responsible for the change in the structure of forged artifacts over time is spontaneous recrystallization. We found that spontaneous recrystallization occurs much more quickly than usually expected at ambient temperature. We derived formulas explaining how the mechanism of relaxation changes on cooling from high to ambient temperature. Some low-energy mechanisms are blocked at elevated temperatures but released at ambient temperature. The activation energy of such mechanisms is much lower than the activation energy of relaxation processes at elevated temperatures. Our findings can be usefully exploited when monitoring processes that degrade the structure of a material in the course of its service.
X-Ray Diffraction (XRD), Iron, Recrystallization
To cite this article
Jaroslav Fiala, Jaroslav Pavelka, Jiří Kříž, Martin Hložek, Pavel Hušťák, Changes in Internal Structure of Bronze and Iron over Time at Ambient Temperature, Advances in Materials. Vol. 2, No. 4, 2013, pp. 53-58. doi: 10.11648/j.am.20130204.12
Angelini E. De Benedetti B. & Rosalbino F. 2004 Corrosion Science. Vol. 46, No 6, pp 1351-1367
Artioli G. Dugnani M. Hansen T. Lutterotti L. Pedrotti A. & Sperl G. 2003 in: "The Copper Age mummy. 2. New finds on the Iceman". edited by Fleckinger A. Museo Archeologico dell'Alto Adige Vol. 3 Folio Verlag Bolzano pp 9-22
Artioli G. & Dugnani M. 2004 Periodicko Mineralogia Vol.73, pp 5-16
Bernier P. 2003 Journal of Physics and Chemistry of Solids Vol. 64, No 4, 64 pp 571-581
Bourdoiseau J.A. Jeannin M. Sabot R. Remazeilles C. & Refait P. 2008 Corrosion Science Vol. 50, No. 11, pp 3247-3255
Buchwald V. F. 2005 in: Iron and steel in ancient times. Kgl. Danske Videnskabernes Selskab pp 45-46. Printed in Denmark by Special-Trykkeriet Viborg a-s ISBN 87-7304-308-7
Castellero A. Moserb B. Uhlenhauta D.I. Dalla Torrea F.H. & Löfflera J.F. 2008 Acta Materialia. Vol. 56, No. 15, pp 3777-3785
Degarmo E. P. Black J T. & Kohser R. A. 2003 Materials and Processes in Manufacturing 9th ed. Wiley ISBN 0-471-65653-4
Duclaux L. Salvetat J.P. Lauginie P. Cacciaguera T. Faugere A.M. Goze-Bac C. Bernier P. 2003 Synthesis and characterization of SWNT-heavy alkali metal intercalation compounds, effect of host SWNTs materials. Journal of Physics and Chemistry of Solids, Vol. 64, No. 4, pp 571-581
Fiala J. & Kolega M. 2005 Particle and particle system characterization Vol. 22 pp 397 – 400
Fiala J. & Kocich R. 2006. In: 36 conference DEFECTOSCOPY 2006. Rekrystalisace při únavě a creepu (Recrystallization at fatigue and creep).
Fiala J. Schindler I. Foret R. & Němeček S. 2002 Strojnický časopis Vol. 53, pp 1-23
Fiala J. & Snyder R.L. 1999 in: "Defect and microstructure analysis by diffraction". edited by Snyder R.L. Fiala J. & Bunge H.J. pp 1-15 Oxford University Press New York
Grömer K. & Mödlinger M. 2005 Archäologie Österreichs Vol. 16, No.2, pp 51-55
Guoa Z. Shaa W. & Vaumousseb D. 2003 Acta Materialia. Vol. 51, No.1, pp 101-116
Hušták P. 2009 Polyfunkční areál "Jiviny /Karlovarská" Praha 6 - Ruzyně Karlovarská ul. Nálezová zpráva archiv nálezových zpráv ARÚP Praha. (Archaeology report)
McConchie M. 2004 in: Iron technology and ironmaking communities of the first millennium BC. Peeters Publishers. ISBN 90-429-1389-4. pp 56. Printed in Belgium 56
Mohan R. & Marschall C. 1998. Acta Materialia. Vol. 46, No.6, pp 1933-1948
Mödlinger M. 2005 Archäologie Österreichs. Vol. 15, No.2, pp 26-29
Read T. T. 1934 Geographical Review xxiv 544-554; 'Largest and oldest iron-castings' Iron Age cxxxvII 1936 pp 18-20
Shalev S. 2004 Prähistorische Bronzefunde Abteilung IV 13. Band. Printed in Germany ISBN 3-515-08198-4 72
Sun Y. Li X.Y. & Bell T. 1999 Journal of Materials Science Vol. 34, No.19, pp 1573-4803
Temple R. 1989 Discovery and Invention pp 42-44. New York: Simon & Schuster
White L.. Jr. 1940 in: Speculum Vol. 15 No. 2 pp 141-159 Published by: Medieval Academy of America
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