On the effect of strain on peritectic reactions and transformations in Fe-Ni and Fe-Cu binary alloys
2009 (English)In: International Journal of Cast Metals Research, ISSN 1364-0461, Vol. 22, no 1-4, 232-235 p.Article in journal (Refereed) Published
Differential thermal analysis (DTA) experiments conducted on Fe-Ni and Fe-Cu alloys showed undercooling below the equilibrium peritectic temperatures, T-P. The intervals between the observed liquidus and peritectic temperatures were on average 11 degrees C and 8 degrees C larger than the intervals obtained from equilibrium phase diagrams of Fe-Ni and Fe-Cu respectively. The transformation from delta-Fe to gamma-Fe during the peritectic reaction is associated with density change and strain build up at the delta-Fe/gamma-Fe interface. Thermodynamic calculations showed that by introducing the strain energy at the delta-Fe/gamma-Fe interface, T-P dropped 9 K below its equilibrium value and the increase in the liquidus-to-peritectic temperature interval was in reasonable agreement with the experimental observations. The growth rate of gamma-Fe during a peritectic transformation was calculated based on the strain-induced undercooling in T-P and the results showed partial agreement with observations obtained from CSLM directional solidification experiments conducted earlier on Fe-Ni alloys.
Place, publisher, year, edition, pages
2009. Vol. 22, no 1-4, 232-235 p.
Peritectic reaction, Interface energy, Strain, Creep, Vacancy
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-10028DOI: 10.1179/136404609X367803ISI: 000268395500057ScopusID: 2-s2.0-70350783810OAI: oai:DiVA.org:kth-10028DiVA: diva2:201453
QC 20100803 2nd International Conference on Advances in Solidification Process, Graz, AUSTRIA, JUN 17-20, 20082009-03-042009-03-042011-03-04Bibliographically approved