高阻尼高强度铸态SiCp/Mg94Zn5Y1 复合材料的综合性能

Evaluation of Comprehensive Performance of High Damping and High Strength As-Cast SiCp/Mg94Zn5Y1 Composites

摘要:

采用铸造方法制备具有不同SiC_p含量（0.5%~2.0%，质量分数，下同）的SiC_p/Mg₉₄Zn₅Y₁复合材料，并研究了复合材料的力学性能和阻尼性能。通过扫描电子显微镜和X射线衍射仪测试复合材料的微观组织结构和物相组成。在基体中加入SiC_p之后，SiC_p均匀分布在基体中，增强体细化了复合材料的微观组织结构。SiC_p/Mg₉₄Zn₅Y₁复合材料包括α-Mg、I相（准晶相）和SiC_p相。分别使用动态热机械分析仪和AG-X试验机测试了SiC_p/Mg₉₄Zn₅Y₁复合材料的阻尼性能和力学性能。复合材料的力学性能优于Mg₉₄Zn₅Y₁合金，1.0%SiC_p/Mg₉₄Zn₅Y₁复合材料的抗压缩强度高达350 MPa；所有复合材料的阻尼性能都远高于基体合金的阻尼性能，其中0.5%SiC_p/Mg₉₄Zn₅Y₁复合材料具有最佳的阻尼性能。此外，根据功效系数法，SiC_p含量为1.0%的SiC_p/Mg₉₄Zn₅Y₁复合材料具有良好的综合性能。

Abstract:

SiC_P/Mg₉₄Zn₅Y₁ composites with 0.5wt%~2.0wt% SiC_p were prepared by the casting method. The mechanical properties and damping capacities of the composites were investigated. The microstructure and phase components of the composites were analyzed via the scanning electron microscopy and X-ray diffraction. Results show that after the addition of SiC_p into the matrix, the SiC_p is evenly distributed in the matrix, which refines the microstructure of the composite. The SiC_p/Mg₉₄Zn₅Y₁ composites contain the α-Mg, I-phase (quasicrystal phase), and SiC_p phase. The damping capacities and mechanical properties of the SiC_p/Mg₉₄Zn₅Y₁ composites were evaluated by the dynamic mechanical analyzer and an AG-X testing machine, respectively. The mechanical properties of the composites are better than those of the original Mg₉₄Zn₅Y₁ alloy. The 1.0wt% SiC_p/Mg₉₄Zn₅Y₁ composite exhibits the compressive strength of 350 MPa. The damping properties of all the composites are much higher than those of the parent alloy. The optimal damping capacity is achieved when the composite contains 0.5wt% SiC_p. Moreover, according to the efficiency coefficient method, the 1.0wt% SiC_p/Mg₉₄Zn₅Y₁ composite has the optimal comprehensive properties.