Fe-27Mn-4Co-2Al 합금의 감쇠능에 미치는 Si의 영향

Abstract

This study investigated the effect of 3%Si on the damping capacity of Fe-27Mn-4Co-2Al alloy. The internal friction was measured with a horizontal internal friction equipment in a vacuum of 10<SUP>-4</SUP> torr using a specimen of (120×10×2) mm obtained from cold-rolled material. The degree of cold rolling was made into four types. Martensite was formed with according to the specific direction and surface relief. The amount of α′-martensite increased sharply as the degree of cold rolling increased. However, the amount of ϵ-martensite decreased after reaching the maximum value in a certain range of cold rolling. internal friction was increased, and then decreased with an increasing of degree of cold rolling. Internal friction increased, and then decreased with an increasing of degree of cold rolling. By adding Si, the formation of ε-martensite was promoted, but the α′-martensite was not affected. Internal friction increased by adding Si. The increase of internal friction was strongly influenced by the amount of ϵ-martensite by cold rolling. Internal friction of cold rolled alloys were dominated by the α′-martensite.