Internal friction behavior of liquid Bi–Sn alloys

Abstract

Pure Bi and Sn and four Bi–Sn alloys distributed on the entire concentration range were selected for internal-friction investigation over a wide temperature range. There exist two peaks in the plots of internal friction versus temperature for liquid Sn, Bi–Sn60 and Bi–Sn90 alloys, one peak being located at about 480 ∘ C and another at about 830 ∘ C . Only a single internal-friction peak at about 830 ∘ C occurs in liquid Bi–Sn43 (eutectic composition). No internal-friction peak appears in liquid Bi–Sn20 alloy and pure Bi. The height of the internal-friction peaks depends on the content of Sn. The present finding suggests that Sn-rich Bi–Sn alloys may inherit the internal-friction behaviors of pure Sn, whereas Bi-rich Bi–Sn alloy seems to be like pure Bi. The position of the internal-friction peaks is frequency dependent, which resembles the internal-friction feature in structure transition in solids.