Friction Behavior Of Amorphous Alloy In The Micro-forming Process Under Low Frequency Vibration Loads

Amorphous alloys have excellent physical, chemical and mechanical properties at room temperature, the supercooled liquid region have good micro forming ability. But the process of amorphous alloy micro-forming exhibit geometrical size effect, particularly friction effect amorphous billet and the mold cavity between the contact surfaces will cause the amorphous alloy flow and deformation uneven, making it difficult to ensure the complex shape micro parts and dimensional accuracy. Vibration molding is a new processing method, the use of vibration loads can improve product quality, improve the interfacial friction, has been widely used in metal and polymer materials. In this paper, a zirconium-based bulk amorphous alloy as the research object, the use of double cup extrusion process, the friction behavior of amorphous alloy in the micro-forming process under low frequency vibration loads a preliminary inquiry.First, the use of water-cooled copper mold suction casting prepared Zr55Al10Ni5Cu30 bulk amorphous alloy samples required for the experiment rule of law and the use of X-ray diffraction analyzer(XRD) and differential scanning calorimetry(DSC) to detect its structural characteristics, it was confirmed amorphous samples. Design double cup extrusion test model, using simulation software Deform-2D friction calibration curve obtained under different vibration force field. On Zwick /well test the mechanical properties of high-temperature furnace equipped with complete double cup extrusion experiments under low frequency vibration loads, frequency 0.05-2Hz, an amplitude of 120-480, the temperature is maintained at 450°C. Three-dimensional electron microscope to measure the height of the sample cup up and down, and friction calibration curve obtained by simulation control, obtained under different vibration frequency and amplitude of vibration force field Zr55Al10Ni5Cu30 bulk amorphous alloys micro-forming during the coefficient of friction.The results showed that: the vibration frequency of the load significantly affect the coefficient of friction, and showing a certain regularity, overall, the friction coefficient decreases with increasing frequency; amplitude, when a vibration frequency of 0.05 and when 0.1hz, little effect on changing the amplitude coefficient of friction; when the vibration frequency of 0.5Hz, 1Hz, when 2Hz, changing the amplitude coefficient of friction to a certain extent of, but not obvious, did not like the vibration frequency as the coefficient of friction on the law follow. Combined with theoretical models of amorphous alloy friction free volume theory and finite element analysis of the reasons for the friction factor changes with the vibration force field.