Y含量对ZM21镁合金组织和力学性能的影响（英文）

Effect of Y on the Microstructure and Mechanical Properties of Mg-2Zn-1Mn Alloy

通过OM、SEM、EDS和XRD等研究了铸态及挤压态Mg-2Zn-1Mn-XY (X=0,0.8,2.2)(质量分数,下同)镁合金显微组织和力学性能。由实验结果可知,稀土Y的添加,不仅可以细化铸态及挤压态合金晶粒,还可以弱化挤压态合金的基面织构强度,从而同时提高合金的强度以及韧性。挤压态Mg-2Zn-1Mn-XY合金具有良好的力学性能,与原始Mg-2Zn-1Mn合金相比,屈服强度从164 MPa提高到204MPa,,抗拉强度从237 MPa提高到298 MPa,以及延伸率从12%增加到18%。

The microstructure and mechanical response of as-cast and extruded Mg-2Zn-1Mn-XY alloys(X=0, 0.8, 2.2, wt%) were investigated by optical microscope(OM), scanning electron microscope(SEM) with X-ray energy dispersive spectrometer(EDS), and X-ray diffractometer(XRD). The results reveal that the addition of Y not only decreases the grain sizes of both as-cast and extruded alloys, but also effectively reduces the basal texture intensity of extruded alloys, which are the two key reasons for the improvement of the strength and ductility of Mg-2Zn-1Mn-XY alloys, simultaneously. The optimized Mg-2Zn-1Mn-XY alloy after extrusion exhibits an attractive mechanical performance. Compared with those of the matrix material Mg-2Zn-1Mn, its yield strength increases from 164 MPa to 204 MPa, the ultimate tensile strength increases from 237 MPa to 298 MPa, and the elongation increases from 12% to 18%.