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High-Temperature Creep and Structure Investigation of Nearly Stoichiometric Fe sub 3 Si. I. Creep Behaviour of Fe--Si Single Crystals

Single crystals of nearly stoichiometric Fe sub 3 Si were creep-deformed at temperature T = 450-850 deg C and applied stress sigma = 40-250 MPa. While the temperature dependence of the steady-state creep rate of crystals with < 25 at.% Si can be described by an exponential function exp (-- Delta...

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Bibliographic Details
Published in:Journal of materials science 1986-07, Vol.21 (7), p.2585-2589
Main Authors: Oertel, C G, Kramer, U, Kleinstuck, K
Format: Article
Language:English
Online Access:Get full text
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Summary:Single crystals of nearly stoichiometric Fe sub 3 Si were creep-deformed at temperature T = 450-850 deg C and applied stress sigma = 40-250 MPa. While the temperature dependence of the steady-state creep rate of crystals with < 25 at.% Si can be described by an exponential function exp (-- Delta H sub exp /kT), the Fe--26 at.% Si samples show an exponential dependence only < 500 deg C and > 600 deg C. At intermediate temperatures the dependence is weak. It is suggested that in this intermediate range two phases exist. The experimental results are consistent with the assumption that the phase boundaries do not hinder dislocation movement, and that the dislocation velocity in the two phases is different. 14 ref.--AA
ISSN:0022-2461