金属Ti的应力弛豫行为

• 作 者: 夏月波 王中光
• 机 构: 中国科学院金属研究所,中国科学院金属研究所 副研究员,沈阳
• 出 处: 金属学报
• 发表日期: 1989年02期
• 关键词: 应力弛豫 Ti 有效应力 应力驰豫 弛豫应力 流变应力 形变量 工业纯 临界应力 应变量

工业纯Ti多晶体在不同拉伸形变量下的应力弛豫研究表明,应力弛豫行为与形变量有关。应力弛豫量Δσ在一定的应力范围内与应力的递降幅度无关,在固定的弛豫时间t_R内与弛豫开始时的应力水平σ_(ao)有关;反馈(临界)应力σ_c和流变应力σ_o具有相同的变化规律;在小形变范围内,作用在材料内部位错上的有效应力σ~*随形变量的增加而增加,在较大形变范围内基本保持不变。

The study on the stress relaxation of industrial pure Ti polycrystalline under different tensile deformations shows that the stress relaxation behavior is related to the amount of deformation. The stress relaxation, Δσ, is independent of the magnitude of stress drop within a certain stress range and is related to the stress level σ ao at the beginning of relaxation within a fixed relaxation time t_R. The feedback (critical) stress σ_c and the flow stress σ_o has the same variation rule. Within the range of small deformation, the effective stress σ ~ * acting on the dislocation inside the material increases with the increase of deformation, and remains unchanged in the larger deformation range.