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超声辐射杆在铝熔体中产生空蚀严重制约其使用寿命及铝熔体的纯净度,针对这一问题,进行了铝熔体钛合金超声辐射杆空蚀试验,采用失重法及熔体Ti元素检测法描述了辐射杆空蚀进程,运用扫描式电子显微镜(SEM)及能谱仪对空蚀试样进行宏/微观形貌观察及成分检测,探讨空蚀各阶段机理.结果表明:辐射杆空蚀以端面为主,随时间推移由端面中心逐渐在横向辐射扩张并在纵向加深;空化孕育期是由于空化泡溃灭冲击辐射杆产生塑变引起的;空化加速期钛合金基体与铝熔体反应生成Al3Ti,该物质硬而脆的特性使钛合金基体在空化冲击作用下脱落是导致失重率快速上升的主要原因;钛合金辐射杆在铝熔体中的空化破坏是由空化泡溃灭冲击及化学腐蚀共同作用导致的.
Ultrasonic radiation rod cavitation in the aluminum melt severely restricts its service life and the purity of aluminum melt. In response to this problem, aluminum melt titanium alloy ultrasonic radiation rod cavitation erosion test, using the weight loss method and melt Ti The element detection method describes the cavitation process of the radiation rod, and the macro / micro morphology observation and composition detection of the cavitation erosion sample are carried out by means of scanning electron microscope (SEM) and energy dispersive spectroscopy to investigate the mechanism of cavitation erosion at different stages. The results show that the radiation The cavitation of the rod is dominated by the end surface, and gradually expands in the transverse direction and deepens longitudinally by the center of the end surface over time. The cavitation period is caused by the plastic deformation of the cavitation bubble during the collapse of the radiation rod. The cavitation accelerating titanium alloy Al3Ti matrix reaction with the aluminum melt, the material hard and brittle nature of the titanium alloy matrix in the role of cavitation impact is the main reason for the rapid rise of the rate of weight loss; titanium alloy rod in the aluminum melt cavitation damage It is caused by the combination of cavitation bubble collapse and chemical attack.