Damping Capacity of Gentalloy in the Fe-W System

Abstract

Measurements of the internal friction Q⁻¹ and mechanical properties have been carried out on open-melted Fe-W alloys containing 0∼20%W. The highest Q⁻¹ value of 34×10⁻³ at room temperature is obtained with an Fe-14%W alloy rapid-cooled after heating at 1200°C for 1 h. The Q⁻¹ value measured at temperature T increases with increasing T, and shows a minimum near T⁄T_c=0.7 (T_c: magnetic transformation temperature). If a static magnetic field H is applied to the specimen, Q⁻¹ shows a two-step decrease with increasing H. The variations of Q⁻¹ and the coercive force H_c with composition and/or heat-treatment are opposite to each other, i.e. the alloys having larger Q⁻¹ exhibit smaller H_c. The mechanical strength of the alloys increases considerably with the W content.