【摘要】 本文研究了铸态、固溶态和时效过程的Mg-1.67at.%Zn-2.3at.%Dy与Mg-1.51at.%Zn-2.77at.%Er合金的微观结构变化及其力学性能的影响。微观分析结果表明,Mg-1.67at.%Zn-2.3at.%Dy与Mg-1.51at.%Zn-2.77at.%Er合金,在493 K温度下时效20 h硬度均达到峰值,峰值硬度分别为106.4 HV和98.7 HV。拉伸试验结果表明,固溶处理后,合金Mg-1.67at.%Zn-2.3at.%Dy与Mg-1.51at.%Zn-2.77at.%Er的抗拉强度均有明显的提高。合金Mg-1.67at.%Zn-2.3at.%Dy固溶后包含三个相,分别是α-Mg相,Mg8Zn Dy共晶相,Mg12Zn Dy LPSO相(包括14H型和18R型)。合金Mg-1.51at.%Zn-2.77at.%Er固溶后包含三个相,分别是α-Mg相,Mg3Zn3Er2共晶相,Mg12Zn Er LPSO相(包括14H型和18R型)。更多还原

【Abstract】 The microstructure and mechanical properties of the as-cast,solid solution and aging process of Mg-1. 67 at. % Zn-2. 3 at. % Dy and Mg-1. 51 at. % Zn-2. 77 at. % Er alloys have been studied. The experimental results indicated that aging-treatment at493 K for 20 h the Mg-1. 67 at. % Zn-2. 3 at. % Dy and Mg-1. 51 at. % Zn-2. 77 at. % Er alloys could achieve their peak hardness 106. 4 HV and 98. 7 HV,respectively. The tensile test results showed that the tensile strength of the Mg-1. 67 at. % Zn-2. 3 at. % Dy and Mg-1. 51 at. % Zn-2. 77 at. % Er alloys were significantly improved after solution-treated. After solution-treated,Mg-1. 67 at. % Zn-2. 3 at. %Dy alloy contains three phases,i. e. α-Mg phase,Mg8 Zn Dy eutectic phase and Mg12 Zn Dy LPSO phase(including 14 H-type and 18 Rtype). Similarly,the solution treated Mg-1. 51 at. % Zn-2. 77 at. % Er alloy contains three phases,i. e. α-Mg phase,Mg3 Zn3 Er2 eutectic phase and Mg12 Zn Er LPSO phase(including 14 H-type and 18 R-type).更多还原