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本文采用正交实验法研究了流变法铸造石墨铝减振合金的工艺,探讨了各工艺参数对石墨粒子的分布及数量和合金减振性能的影响,研究表明石墨铝减振合金的理想组织为片状石墨分散于细密的基体组织中。本研究确定了最佳的工艺参数一搅拌速度700rpm,开始搅拌温度625℃,搅拌总时间7min,石墨预热时间5h,铸型温度150℃,压力245MPa,浇注温度590℃,保压时间15Sec.利用优化的工艺参数,铸造出了石墨含量(体积分数)6%～22%的石墨铝减振合金,研究了其减振性能和机械性能,并总结出了石墨含量与合金的减振性能和机械性能的关系式Q-1(×10-3)=5.131+1.167x(vol%);σb=107.372-2.769x(Vol%).此公式表明,石墨铝减振合金的内耗随石墨含量的升高单调上升,抗拉强度随石墨含量的升高而下降。借助于透射电镜、电子探针等手段,初步探讨了石墨铝减振合金的减振机理,并指出其内耗主要来源于两相界面的粘滞性流动。
In this paper, the orthogonal experiment was used to study the process of rheological casting graphite aluminum damping alloy, to explore the process parameters on the distribution and quantity of graphite particles and damping properties of the alloy, the research shows that the ideal organization of graphite aluminum damping alloy as Flake graphite dispersed in the fine matrix organization. In this study, the best process parameters were determined as follows: stirring speed 700rpm, start stirring temperature 625 ℃, total stirring time 7min, graphite preheating time 5h, casting temperature 150 ℃, pressure 245MPa, pouring temperature 590 ℃, dwell time 15Sec By using the optimized process parameters, graphite aluminum damping alloy with 6% -22% graphite content was cast, its damping and mechanical properties were studied, and the relationship between graphite content and damping performance And the mechanical properties of the formula Q-1 (× 10-3) = 5.131 + 1.167x (vol%); σb = 107.372-2.769x (Vol%). This formula shows that the internal friction of graphite aluminum damping alloy with graphite content Increased monotonically, tensile strength decreased with the increase of graphite content. The mechanism of vibration damping of graphite aluminum damping alloy was discussed by means of transmission electron microscope and electron probe, and the internal friction was mainly derived from the viscous flow at the interface of two phases.