ABSTRACT

Different weight ratios of cerium (0.5, 1 and 2 wt.%) were produced in a controlled atmosphere by High Pressure Die Cast method to Mg-6Al-0.3Mn-1Sn alloy. The influence of cerium on microstructure and high-temperature mechanical properties was investigated. The microstructure study revealed that the main alloy contains intermetallic phases such as α-Mg, β- Mg₁₇Al₁₂, Mg₂Sn and Al₁₁Ce₃. The hardness values of the alloys were increased with the addition of 0.5%, 1 and 2 cerium. With the addition of 0.5 wt.% Ce, the yield strength increased to 145 MPa. With the addition of 2 wt.% of Ce, it was found to be 160 MPa with an increase of 14%. Tensile strength was obtained as 190 MPa. Elevated temperature tensile test was carried out at 120°C, 180°C and 240°C, to all the alloys. It was found that increased Ce ratio increased the high-temperature mechanical strength. At 120°C, the highest tensile and yield strength values were obtained with 159 MPa and 147 MPa, respectively, in the alloy with 2% wt. cerium added. In the tensile test performed at 180°C, the highest tensile and yield strength were measured as 91 MPa and 77 MPa, respectively. The operating temperature of Mg alloys produced industrially by HPDC has a significant effect on mechanical properties. High operating temperatures reduce mechanical properties. However, the mechanical properties at high test temperatures were increased by the addition of Ce metal to the AM60-1Sn-XCe alloy produced with HPDC.

摘要

不同重量比的铈（0.5、1 和 2 wt.%）在受控气氛中通过高压压铸方法生产到 Mg-6Al-0.3Mn-1Sn 合金。研究了铈对微观结构和高温机械性能的影响。显微组织研究表明，主要合金含有金属间相，如α-Mg、β-Mg ₁₇ Al ₁₂、Mg ₂ Sn 和Al ₁₁ Ce ₃. 合金的硬度值随着添加 0.5%、1 和 2 铈而增加。添加 0.5 wt.% Ce 后，屈服强度增加到 145 MPa。添加2wt.%的Ce后，发现增加了14%，达到了160 MPa。获得的拉伸强度为 190 MPa。对所有合金在 120°C、180°C 和 240°C 下进行高温拉伸试验。发现增加的Ce比率增加了高温机械强度。在 120°C 时，在 2% wt 的合金中分别获得了 159 MPa 和 147 MPa 的最高拉伸强度和屈服强度值。添加了铈。在 180°C 下进行的拉伸试验中，最高拉伸强度和屈服强度分别为 91 MPa 和 77 MPa。HPDC工业生产的镁合金的工作温度对机械性能有显着影响。高工作温度会降低机械性能。然而，通过向 HPDC 生产的 AM60-1Sn-XCe 合金中添加 Ce 金属，提高了高测试温度下的机械性能。