Y含量对挤压态Mg-Y-Zn合金室温和高温力学性能的影响
发布时间：2018-09-19 08:19
【摘要】：利用OM、SEM、TEM和电子万能试验机研究Y元素的含量对3种Mg-Y-Zn合金的显微组织和室温及高温力学性能的影响。结果表明,挤压态Mg_(97)Y_2Zn_1和Mg_(96)Y_3Zn_1合金主要由α-Mg基体、沿挤压方向排列的带状18R-LPSO相和α-Mg内的层片状14H-LPSO相组成,而Y含量最高的Mg_(95)Y_4Zn_1合金中还形成Mg_(24)Y_5相颗粒。室温时,随Y含量的增加,合金的抗拉强度逐渐升高,塑性不断下降;随温度的升高,3种合金的抗拉强度均下降,但塑性显著提升。由于合金中起强化作用的LPSO相和Mg_(24)Y_5相热稳定性好,合金在高温时仍保持优异的力学性能,其中Mg_(95)Y_4Zn_1合金在300℃时的抗拉强度为252 MPa,伸长率达到27.1%。总体来看,Mg_(96)Y_3Zn_1合金具有最佳的综合力学性能。
[Abstract]:The effect of Y content on the microstructure, mechanical properties at room temperature and high temperature of three Mg-Y-Zn alloys was studied by OM,SEM,TEM and electronic universal testing machine. The results show that the extruded Mg_ (97) Y_2Zn_1 and Mg_ (96) Y_3Zn_1 alloys are mainly composed of 伪 -Mg matrix, banded 18R-LPSO phase arranged along the extrusion direction and lamellar 14H-LPSO phase in 伪 -Mg, while Mg_ (24) Y _ (5) phase particles are also formed in Mg_ (95) Y_4Zn_1 alloy with the highest Y content. At room temperature, the tensile strength of the alloy increases with the increase of Y content, and the plasticity decreases, and the tensile strength of the three alloys decreases with the increase of temperature, but the plasticity increases significantly. Because of the good thermal stability of LPSO phase and Mg_ (24) Y _ 5 phase in the alloy, the alloy still has excellent mechanical properties at high temperature. The tensile strength of Mg_ _ (95) Y_4Zn_1 alloy at 300 鈩，
本文编号：2249568
[Abstract]:The effect of Y content on the microstructure, mechanical properties at room temperature and high temperature of three Mg-Y-Zn alloys was studied by OM,SEM,TEM and electronic universal testing machine. The results show that the extruded Mg_ (97) Y_2Zn_1 and Mg_ (96) Y_3Zn_1 alloys are mainly composed of 伪 -Mg matrix, banded 18R-LPSO phase arranged along the extrusion direction and lamellar 14H-LPSO phase in 伪 -Mg, while Mg_ (24) Y _ (5) phase particles are also formed in Mg_ (95) Y_4Zn_1 alloy with the highest Y content. At room temperature, the tensile strength of the alloy increases with the increase of Y content, and the plasticity decreases, and the tensile strength of the three alloys decreases with the increase of temperature, but the plasticity increases significantly. Because of the good thermal stability of LPSO phase and Mg_ (24) Y _ 5 phase in the alloy, the alloy still has excellent mechanical properties at high temperature. The tensile strength of Mg_ _ (95) Y_4Zn_1 alloy at 300 鈩，
本文编号：2249568
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