| Title |
Effect of Li Addition on the Microstructure and Mechanical Properties of AZ31 Based Alloy |
| Authors |
김용호(Yong Ho Kim); 김정한(Jung Han Kim); 유효상(Hyo Sang Yoo); 최정원(Jeong Won Choi); 손현택(Hyeon Taek Son) |
| DOI |
https://doi.org/10.3365/KJMM.2015.53.5.336 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
metals; extrusion; texture; electron backscattering diffraction; EBSD; Mechanical property |
| Abstract |
Effects of Li addition on the microstructure and mechanical properties of as-cast and as-extruded AZ31-xLi alloys were investigated. AZ31 alloys with different Li addition(0, 2, 5, 8 and 11 wt%) were cast under atmosphere at 720 ℃ and extruded at 200 ℃. Li addition to AZ31 resulted in the formation of AlLi and MgLi2Al intermetallic compounds and random texture. With increasing Li addition from 5 to 8 and 11 wt%, ultimate tensile strength was decreased from 264 to 232 and 193 MPa. On the other hand, the elongation was improved remarkably from 15.6% to 14.2% and 38.6% at room temperature due to the transformation from HCP to BCC crystal structure and a weaker basal texture. With increasing Li addition from 5 to 8 and 11 wt%, compression yield strength was increased from 156 to 193 and 178 MPa. MgLi2Al intermetallic compounds played a significant role for the increase of the mechanical properties. |