感应电流频率对原位合成Al3Ti/Al复合材料组织及性能的影响[1]

Effect of Induced Current Frequency on Microstructure and Properties of In-situ Synthesized Al3Ti/ Composites

摘要:

以金属铝为基体，以钛纤维为反应源获得铸态的钛铝预制复合体，通过对其施加不同频率的交变电流，在外场作用下促进铝、钛原子间的反应，以期获得Al3Ti颗粒增强铝基复合材料。通过差热分析(DTA)预判断钛铝间反应温度为800℃左右，通过XRD、SEM和磨损测试对所得复合材料进行分析表征。结果表明：原位反应最佳参数为：频率7KHz、电流8A、反应时间5min。此参数下，钛纤维完全反应，主要相Al3Ti分散性较好，颗粒尺寸细化至3μm左右；在10N载荷条件下，随着频率的增大，摩擦系数先降后升，频率7KHz时的摩擦系数为最低值0.2，磨损量较最少，耐磨性能较优。

Abstract:

Using metal Al as substrate and titanium fiber as reactive source，an Al3Ti/Al composite was fabricated by applying induction heating，and the inductive magnetic field generate by the coil was used to promote the in-situ reaction rate of aluminum and titanium.The reaction temperature was preliminarily judged by differential thermal analysis (DTC) to be about 800 degrees, and the obtained samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and wear testers.The results show that when the alternating current frequency is 7KHz, the current is 8A, and the time is 5min.,the titanium fiber react with Al completely，and the dispersed distribution of Al3Ti particles are in-situ synthesized, and the average size of the particles reach 3μm; Under the condition of 10N load and air as medium, the friction coefficient decreases first and then increases with the increase of alternating current frequency. The friction coefficient at the frequency of 7KHz is the lowest value of 0.2, the wear amount is the least, and the wear resistance is optimal.