IN-SITU OBSERVATION OF S’PHASE IN Al-Li BASE ALLOY USING TEM SERIAL ROTATION TECHNIQUE
(Harbin Institute of Technolgy, Harbin 150006, China)
Abstract: An in situ observation of the s' phase morphology and its orientation with the matrix in an AI-Li base alloy was carried out by means of double-tilt rotating around [220]α in a transmission electron microscope (TEM). The results show that the s' phase precipitates in the form of bundles. The units of s' phase are lath-shaped, grow along the <100>α orientation, and have habit planes of {210}α. Many units of the s'phase grow in the same orientation and get together to form a plate-shaped bundle of s' phase laths which lie on the {110}α planes.
Key words: Al-Li base alloy s'phase in-situ observation TEM