Effects of samarium content on microstructure and mechanical properties of Mg–0.5Zn–0.5Zr alloy
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In: Journal of Materials Science and Technology, Vol. 35, No. 7, 07.2019, p. 1368-1377.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Effects of samarium content on microstructure and mechanical properties of Mg–0.5Zn–0.5Zr alloy
AU - Guan, Kai
AU - Meng, Fanzhi
AU - Qin, Pengfei
AU - Yang, Qiang
AU - Zhang, Dongdong
AU - Li, Baishun
AU - Sun, Wei
AU - Lv, Shuhui
AU - Huang, Yuanding
AU - Hort, Norbert
AU - Meng, Jian
PY - 2019/7
Y1 - 2019/7
N2 - Effects of samarium (Sm) content (0, 2.0, 3.5, 5.0, 6.5 wt%) on microstructure and mechanical properties of Mg–0.5Zn–0.5 Zr alloy under as-cast and as-extruded states were thoroughly investigated. Results indicate that grains of the as-cast alloys are gradually refined as Sm content increases. The dominant intermetallic phase changes from Mg 3 Sm to Mg 41 Sm 5 till Sm content exceeds 5.0 wt%. The dynamically precipitated intermetallic phase during hot-extrusion in all Sm-containing alloys is Mg 3 Sm. The intermetallic particles induced by Sm addition could act as heterogeneous nucleation sites for dynamic recrystallization during hot extrusion. They promoted dynamic recrystallization via the particle stimulated nucleation mechanism, and resulted in weakening the basal texture in the as-extruded alloys. Sm addition can significantly enhance the strength of the as-extruded Mg–0.5Zn–0.5 Zr alloy at room temperature, with the optimal dosage of 3.5 wt%. The optimal yield strength (YS) and ultimate tensile strength (UTS) are 368 MPa and 383 MPa, which were enhanced by approximately 23.1% and 20.8% compared with the Sm-free alloy, respectively. Based on microstructural analysis, the dominant strengthening mechanisms are revealed to be grain boundary strengthening and dispersion strengthening.
AB - Effects of samarium (Sm) content (0, 2.0, 3.5, 5.0, 6.5 wt%) on microstructure and mechanical properties of Mg–0.5Zn–0.5 Zr alloy under as-cast and as-extruded states were thoroughly investigated. Results indicate that grains of the as-cast alloys are gradually refined as Sm content increases. The dominant intermetallic phase changes from Mg 3 Sm to Mg 41 Sm 5 till Sm content exceeds 5.0 wt%. The dynamically precipitated intermetallic phase during hot-extrusion in all Sm-containing alloys is Mg 3 Sm. The intermetallic particles induced by Sm addition could act as heterogeneous nucleation sites for dynamic recrystallization during hot extrusion. They promoted dynamic recrystallization via the particle stimulated nucleation mechanism, and resulted in weakening the basal texture in the as-extruded alloys. Sm addition can significantly enhance the strength of the as-extruded Mg–0.5Zn–0.5 Zr alloy at room temperature, with the optimal dosage of 3.5 wt%. The optimal yield strength (YS) and ultimate tensile strength (UTS) are 368 MPa and 383 MPa, which were enhanced by approximately 23.1% and 20.8% compared with the Sm-free alloy, respectively. Based on microstructural analysis, the dominant strengthening mechanisms are revealed to be grain boundary strengthening and dispersion strengthening.
KW - Magnesium alloys
KW - Mechanical properties
KW - Microstructure
KW - Samarium
KW - Transmission electron microscopy (TEM)
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85062890934&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2019.01.019
DO - 10.1016/j.jmst.2019.01.019
M3 - Journal articles
AN - SCOPUS:85062890934
VL - 35
SP - 1368
EP - 1377
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
SN - 1005-0302
IS - 7
ER -