论文部分内容阅读
研究不同稀土Y含量对Mg-6Zn-1Mn合金显微组织和力学性能的影响。结果表明:Y元素的添加对Mg-6Zn-1Mn合金的相结构、组织和力学性能有明显的影响。随着Y含量的增加,合金中的第二相依次从Mg7Zn3相、I相(Mg3YZn6)、I相+W相(Mg3Y2Zn3)到W相+X相(Mg12YZn)转变;热分析和组织观察证明合金相的稳定性趋势为X相>W相>I相>Mg7Zn3相;Mn元素主要以单质颗粒形式弥散分布在基体中;Y的添加能显著提升Mg-Zn-Mn合金的力学性能,其中含6.09%Y的挤压态合金具有最佳的力学性能,其抗拉强度和屈服强度分别达到389 MPa和345 MPa。合金强度的提升主要源于Y元素的晶粒细化、Mn颗粒的弥散强化和Mg-Zn-Y稀土相的引入。
The effect of different rare earth Y content on the microstructure and mechanical properties of Mg-6Zn-1Mn alloy was studied. The results show that the addition of Y element has a significant effect on the phase structure, microstructure and mechanical properties of Mg-6Zn-1Mn alloy. With the increase of Y content, the second phase in the alloy changes from Mg7Zn3 phase, I phase (Mg3YZn6), I phase + W phase (Mg3Y2Zn3) to W phase + X phase (Mg12YZn) in turn. Thermal analysis and microstructure observation show that the alloy The phase stability trends for the X phase> W phase> I phase> Mg7Zn3 phase; Mn element mainly in the form of elemental particles dispersedly distributed in the matrix; Y addition can significantly enhance the mechanical properties of Mg-Zn-Mn alloy, which contains 6.09 Extruded alloy of% Y has the best mechanical properties, and its tensile strength and yield strength reach 389 MPa and 345 MPa, respectively. The improvement of alloy strength is mainly attributed to grain refinement of Y element, dispersion strengthening of Mn particles and introduction of rare earth phase of Mg-Zn-Y.