Phase Composition Formation in a V-1469 Alloy (Al-Cu-Li System) during Friction Stir Welding
Abstract
The morphology of the intermetallic phases and their contents in the welded joint zones of a V-1469 alloy (Al-Cu-Li system) are studied by X-ray diffraction and transmission electron microscopy. Welding is shown to change the phase composition, the crystallographic texture, and the microhardness of the alloy. According to quantitative X-ray diffraction analysis, the T1-phase content decreases and the δ'-phase content increases in the weld metal. As a result, the microhardness in the weld zone decreases, since the T1 phase is much stronger hardener than the δ' phase. This effect weakens when the weld root is approached.
- Publication:
-
Russian Metallurgy
- Pub Date:
- November 2018
- DOI:
- 10.1134/S0036029518110046
- Bibcode:
- 2018RuMet2018.1059B
- Keywords:
-
- friction stir welding;
- Al-Cu-Li alloy;
- transmission electron microscopy (TEM);
- X-ray diffraction (XRD) analysis;
- quantitative phase analysis;
- intermetallic phases