Effect of Nd on microstructure and mechanical properties of as-extruded Mg-Y-Zr-Nd alloy. Issue 9 (September 2017)

• Record Type: Journal Article
• Authors: Xu, Xiaoyang; Chen, Xianhua; Du, Weiwei; Geng, Yuxiao; Pan, Fusheng
• Is Part Of: Journal of materials science & technology. Volume 33:Issue 9(2017:Sep.)
• Page Start: 926
• Page End: 934
• Publication Date: 2017-09
• Subjects: Mg-Y-Zr-Nd -- Extrusion -- Microstructure -- Tensile properties -- Precipitate; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2017.04.011
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: The microstructure and mechanical properties of Mg-Y-Zr- x Nd alloys with 0–2.63 wt% Nd were investigated using optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction and tensile testing test. Results indicated that more Mg24 Y5 particles and Mg14 Nd2 Y ( β ) phases were dispersed in the matrix when Nd content increased from 0 wt% to 2.63 wt% in the extruded alloys. Consequently, the nucleation of dynamic recrystallization and the volume fraction of recrystallized grains were promoted obviously. The average grain size can be refined in the range of 4.6–1.3 μm after the addition of 2.63 wt% Nd. The tensile strength of extruded alloys increased with increasing Nd content, and elongation exhibited an opposite change tendency. The extruded alloy sheet with 1.01 wt% Nd demonstrates optimal combination of strength and plasticity, i.e., the ultimate tensile strength, yield strength, and elongation were 273 MPa, 214 MPa, and 24.2%, respectively. Variations in mechanical properties are discussed on the basis of microstructure observations.