超声振动对纯钛TA1微圆柱体压缩过程的影响  

Influence of ultrasonic vibration on pure titanium TA1 micro cylinder compression

作　　者：路腾腾 申昱[1] 于沪平[1] 董湘怀[1] 胡俊[1] 

机构地区：[1]上海交通大学模具CAD国家工程研究中心,上海200030

出　　处：《塑性工程学报》2016年第6期14-18,共5页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(50835002)

摘　　要：塑性成形中施加超声振动可以软化金属、改善材料成形性能,在拉拔等塑性成形工艺中已有广泛的应用,但超声振动在微成形中的应用则需要首先研究其对介观尺度材料成形性能的影响规律。文章设计了不施加超声振动和施加超声振动条件下纯钛TA1微圆柱体的压缩试验,研究了其流动应力的变化特点。试验结果表明,施加超声振动后材料流动应力的降幅随着试样尺寸的减小和超声振幅的增加而增加;材料的硬化指数随着单位体积材料吸收超声能量的增加先增大后减小。Ultrasonic vibration excitation can soften material and improve the material formability, and it has been widely used in the drawing process. However, the effects of ultrasonic vibration on mesoscopic scale material should be studied before applying its benefits to metallic micro-forming. The influence of ultrasonic vibration on the flow stress characteristics of pure titanium TA1 micro cylinder was investigated by conducting the compression process with and without ultrasonic vibration excitation. The results show that under the ultrasonic vibration excitation condition, the decreasing amplitude of material flow stress increases with the decrease of the specimen size and increase of ultrasonic vibration amplitude. With the increase of absorbed ultrasonic energy in unit volume, the material hardening exponent increases first and then decreases.

关 键 词：超声振动 压缩试验 纯钛 介观尺度 

分 类 号：TG301[金属学及工艺—金属压力加工]