利用扫描电子显微镜(SEM)、电子背散射衍射(EBSD)和X-射线衍射(XRD)分析了元素Zn、Ag对热挤压单相生物镁合金微观组织及力学性能的影响.X射线衍射结果表明元素Zn和Ag的添加没有改变镁合金的相组成及晶体结构.与未添加Zn和Ag元素的合金相比,添加3％ Zn元素镁合金(Mg-3Zn合金)的屈服强度由101 MPa提高到121 MPa,抗拉强度由188 MPa提高到228 MPa,而延伸率由17.86％降低至12.57％.进一步添加0.5％的元素Ag后,合金(Mg-3Zn-0.5Ag合金)的屈服强度和抗拉强度没有明显变化,但延伸率提高至14.77％.EBSD和XRD织构分析结果表明,添加合金元素Zn和Ag后镁合金的晶粒尺寸增大,晶粒中的孪晶数量减少,但{0002}基面织构强度增加,这是其力学性能差异的根本原因.
The influences of Zn and Ag elements on the mechanical properties and microstructure of extruded mono-phase biomedical magnesium alloys were investigated via scanning electron microscopy (SEM),electron backscatter diffraction (EBSD) and X-ray diffraction (XRD) analysis.The result of XRD analysis shows that the addition of Zn and Ag did not changed the phase composition and crystal structure of magnesium alloy.With the addition of 3％ Zn,the yield tensile strength (YTS) and ultimate tensile strength (UTS) of Mg-3Zn alloy are increased from 101 MPa to 121 MPa and from 188 MPa to 228 MPa,respectively,Whereas,the elongation is decreased from 17.86％ to 12.57％.The YTS and UTS of Mg-3Zn-0.5Ag alloy are almost same as that of Mg-3Zn alloy,while the elongation of Mg-3Zn-0.5Ag alloy is increased from 12.57％ to 14.77％ with the addition of Ag into Mg-3Zn alloy.EBSD and XRD texture analysis results show that the grain sizes of Mg-3Zn and Mg-3Zn-0.5Ag alloys are larger,the number of twin grains decreased,but the {0002} texture intensity increases corresponding to that of magnesium alloy without Zn and Ag addition,which is the fundamental reason for the differences in the mechanical properties of magnesium alloy.
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