Different Damping Dependences on Volume Fractions of Thermal and Deformation-Induced ε Martensites in an Fe-Mn Alloy

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We reports the damping properties of an Fe-23%Mn alloy with various amounts of thermal or deformation-induced ε martensite. By controlling cooling temperatures and cold rolling degrees, the volume fractions of thermal and deformation-induced ε martensites are changed from 33 to 50% and from 33 to 75%, respectively. The damping capacity of the Fe-23%Mn alloy increases with an increase in thermal ε martensite content, whereas the damping capacity associated with deformation-induced ε martensite shows a peak value at 57% of ε martensite. Transmission electron micrographs on deformed samples reveal that the decay of damping over 57% of deformation-induced ε martensite is caused by an introduction of perfect dislocations, which play a role in suppressing the movement of damping sources. For the same amount of ε martensite, deformation-induced ε martensite exhibits higher level of damping capacity than thermal ε martensite. This may well be owing to relatively greater length of γ/ε interfaces in response to higher number density of ε martensite plates.

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Periodical:

Edited by:

N. Igata and S. Takeuchi

Pages:

79-84

DOI:

10.4028/www.scientific.net/KEM.319.79

Citation:

J. H. Jun et al., "Different Damping Dependences on Volume Fractions of Thermal and Deformation-Induced ε Martensites in an Fe-Mn Alloy", Key Engineering Materials, Vol. 319, pp. 79-84, 2006

Online since:

September 2006

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$35.00

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