【摘要】 对高应变率下变形的β-钛合金,用光学显微镜和扫描电镜观察研究了其绝热剪切带的显微组织。表明随变形的增加,依次有三种类型的绝热剪切带,即:形变带,具有细条状微晶结构和具有等轴微晶结构的转变带。在大形变量时,均沿绝热剪切带出现裂纹。在讨论绝热剪切判据时区分绝热剪切变形,绝热剪切断裂和热塑失稳是重要的。更多还原

【Abstract】 The microstructure of adiabatic shearing band for β-Ti alloy deformed at high strain rate was observed undermetallographic microscope and SEM. Three types of adiabatic shearing bands, namely, the deformation band, the transformation bands with fine stripped microcrystalline structure and with equiaxied very fine microcrystalline structure are found in sequence Under very large deformation, it may be cracked along the adiabatic shearing band With regard to discuss the criterion of adiabatic shearing, the distinction among the adiabatic shearing deformation, the adiabatic shearing fracture and the thermoplastic instability is important更多还原