TY - JOUR

T1 - The effect of Y addition on recrystallization and mechanical properties of Mg–6Zn–xY–0.5Ce–0.4Zr alloys

AU - Liu, Lizi

AU - Pan, Fusheng

AU - Chen, Xianhua

AU - Huang, Yuanding

AU - Song, Bo

AU - Yang, Hong

AU - Hort, Norbert

PY - 2018/9

Y1 - 2018/9

N2 - Microstructure and mechanical properties of extruded Mg–6Zn–xY–0.5Ce–0.4Zr sheets were systematically investigated. Mg–Zn–Ce, I-phase (Mg3Zn6Y) and W-phase (Mg3Zn3Y2) with different morphologies were observed in as-cast and extruded conditions. Numerous nano-precipitates were found along grain boundaries and inside grains in both dynamically recrystallized (DRXed) and unDRXed regions after hot extrusion. The area fraction of DRXed regions increases with Y additions mainly due to particle stimulated nucleation (PSN). An extruded fiber texture was observed after hot extrusion. The texture is strengthened firstly and then weakened. The extruded alloys with 0.5–1 wt% Y and 0.5 wt% Ce exhibit much better mechanical properties compared with other Mg alloys such as Mg–5Zn–1Y–1Zr (wt.%) and Mg–6Zn–1Ce–0.5Zr (wt.%) alloys under the same extrusion ratio. The extruded alloy with 0.2 wt% Y and 0.5 wt% Ce has the yield strength of 322 MPa, ultimate tensile strength of 378 MPa and elongation of 8.6%, which is the highest value among the studied alloys. Grain boundary strengthening and precipitation strengthening are the two most important factors for improving yield strength of Mg–6Zn–xY–0.5Ce–0.4Zr alloys. The addition of Y is an effective way in significantly improving the mechanical properties of Mg–6Zn–xY–0.5Ce–0.4Zr alloys.

AB - Microstructure and mechanical properties of extruded Mg–6Zn–xY–0.5Ce–0.4Zr sheets were systematically investigated. Mg–Zn–Ce, I-phase (Mg3Zn6Y) and W-phase (Mg3Zn3Y2) with different morphologies were observed in as-cast and extruded conditions. Numerous nano-precipitates were found along grain boundaries and inside grains in both dynamically recrystallized (DRXed) and unDRXed regions after hot extrusion. The area fraction of DRXed regions increases with Y additions mainly due to particle stimulated nucleation (PSN). An extruded fiber texture was observed after hot extrusion. The texture is strengthened firstly and then weakened. The extruded alloys with 0.5–1 wt% Y and 0.5 wt% Ce exhibit much better mechanical properties compared with other Mg alloys such as Mg–5Zn–1Y–1Zr (wt.%) and Mg–6Zn–1Ce–0.5Zr (wt.%) alloys under the same extrusion ratio. The extruded alloy with 0.2 wt% Y and 0.5 wt% Ce has the yield strength of 322 MPa, ultimate tensile strength of 378 MPa and elongation of 8.6%, which is the highest value among the studied alloys. Grain boundary strengthening and precipitation strengthening are the two most important factors for improving yield strength of Mg–6Zn–xY–0.5Ce–0.4Zr alloys. The addition of Y is an effective way in significantly improving the mechanical properties of Mg–6Zn–xY–0.5Ce–0.4Zr alloys.

KW - Dynamic recrystallization

KW - Mechanical properties

KW - Mg–6Zn–xY–0.5Ce–0.4Zr alloys

KW - Microstructure

KW - Texture

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85048856480&partnerID=8YFLogxK

U2 - 10.1016/j.vacuum.2018.06.048

DO - 10.1016/j.vacuum.2018.06.048

M3 - Journal articles

AN - SCOPUS:85048856480

VL - 155

SP - 445

EP - 455

JO - Vacuum

JF - Vacuum

SN - 0042-207X

ER -