热塑剪切失稳(绝热剪切)是广泛存在于许多动态塑性变形过程中的一种材料破坏现象。蓝脆效应是某些钢类材料特有的一种强度温度特性。认识二者之间的关系,对于动态塑性工程设计中的合理选材和过程优化十分重要。金属切削过程所具有的大应变、高应变率和热集中环境,对于许多难加工金属材料,很容易观察到热塑剪切失稳的发生,这些材料包括钛及其 Thermoplastic shear instability (adiabatic shear) is a material failure phenomenon that exists extensively in many dynamic plastic deformation processes. The blue brittleness effect is a kind of strength and temperature characteristic peculiar to some steel materials. Understanding the relationship between the two is very important for the rational material selection and process optimization in dynamic plastic engineering design. The large strain, high strain rate, and heat concentration environment that the metal cutting process possesses makes it easy to see the occurrence of thermoplastic shear instability for many difficult-to-machine metal materials, including titanium and its