切削速度对单晶锗脆塑转变的影响

Effect of Cutting Speed on Brittle Plastic Transition of Single Crystal Germanium

采用纳米压痕仪对单晶锗(100)(110)(111)晶面进行了纳米划痕实验,分析不同划痕速度对单晶锗不同晶面脆塑转变临界状态变化规律的影响,采用原子力显微镜对样品表面进行扫描观测。结果表明:划痕速度增加,单晶锗产生塑性去除的区域增大;但划痕速度过大,就会降低单晶锗产生塑性去除的区域。预测了在超精密切削加工中切削速度对单晶锗发生脆塑转变时的临界状态的影响规律,为实际超精密切削加工单晶锗零件提供数据支持。

The influence of different scratching speed of scratches on the critical state of brittle-plastic transition of single crystal germanium was studied based on the nano-scratch experiments,which were carried out on single crystal germanium（100）（110）（111） crystal surface by using a nano indentation instrument.Atomic force microscope was applied to observe the material surface.The results show that the plastic removal region of single crystal germanium will increase with the scratching speed raises.Nevertheless,the plastic removal region of single crystal germanium may decrease if the speed of scratches is too large.Furthermore,the influencing rules of cutting speed on the critical state of brittle to plastic transition of single crystal germanium in the ultra-precision machining process is predicted,which provides the data support for the ultra-precision machining of single-crystal germanium parts.