| The research object in this paper is aluminum matrix composites. The workpieces formed from traditional aluminum alloy material have poor mechanical property and flaws, which can’t meet the requirements of modern materials. Combined with high-energy ultrasonic acoustic cavitation effect, the fabrication of composite materials by in-situ synthesis is an advanced forming technology which is energy saving and has high material utilization and short production cycle. This paper uses three different morphology titanium powder and 7050 aluminum alloy as raw materials to make composite through ultrasonic chemistry combined with in-situ reaction. Then the composite is processed through the appropriate solid solution-aging treatment.The the optimized processing parameter of coposites was determined by the research of the impact of the titanium powders morphology, reinforced particles mass fraction and ultrasonic power on the texture and properties of TiAl3/7050 Al composites. It is found that the workpieces possessed uniform and compact texture as well as good mechanical properties when it is spongy titanium powder 6wt% TiAl3The different solid solution and aging parameter heat treatment experiment was researched on TiAl3/7050 Al composites. The compact of different heat treatment parameter on workpieces texture and mechanical properties was analyzed by metalloscope, SEM, TEM, XRD observation and hardness, mechanical properties, abrasive resistance test. The optimum heat treatment process of TiAl3/7050 Al composites was determined. The optimum performance, 580 MPa tensile strength and 11.2% elongation was obtained when the parameter is 500℃×1h solid solution, 120℃×18h aging.In this work, the abrasive resistance of TiAl3/7050 Al composites before and after heat treatment was tested. The impact of parameters and second phase after heat treatment on composites when increasing external load and sliding speed was researched. The friction mechanism of different conditions was analyzed. |
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