论文部分内容阅读
采用半固态搅拌、低过热度重力浇注的方法制备了SiCp/Gr颗粒复合增强ZL101铝基复合材料。通过显微组织观察、拉伸试验以及阻尼性能测试,研究了不同体积分数SiCp/Gr对铝基复合材料性能的影响。结果表明,通过半固态搅拌、低过热度重力铸造法,使ZL101合金中的初生相α-Al由枝晶形态变为蔷薇状,晶粒明显细化。随着SiCp体积分数的增加,复合材料的抗拉强度先升高后降低,伸长率逐渐下降,复合材料的最高抗拉强度达到191MPa,比ZL101合金提高了32%。SiCp与Gr的加入改善了ZL101合金的阻尼性能,复合材料的内耗值Q-1明显高于基体合金,并且随着SiCp体积分数的增加,复合材料内耗值Q-1逐渐提高。
SiCp / Gr particles composite reinforced ZL101 aluminum matrix composites were prepared by semi-solid stirring and low superheat gravity casting. The effects of different volume fractions of SiCp / Gr on the properties of aluminum matrix composites were investigated by microstructure observation, tensile test and damping performance test. The results show that the α-Al phase in the primary phase of ZL101 alloy changes from dendritic morphology to rose-like shape through gravimetric casting with semi-solid stirring and low superheat degree, and the grains are obviously refined. With the increase of volume fraction of SiCp, the tensile strength of the composites first increased and then decreased, and the elongation decreased gradually. The maximum tensile strength of the composites reached 191MPa, which was 32% higher than that of ZL101 alloy. The addition of SiCp and Gr improves the damping properties of ZL101 alloy. The internal friction value Q-1 of composite is obviously higher than that of matrix alloy. With the increase of SiCp volume fraction, the internal friction Q-1 of composite increases.