AN ANALYSIS OF THE LOW-TEMPERATURE, LOW AND HIGH STRAIN-RATE DEFORMATION OF TI-6AL-4V
AN ANALYSIS OF THE LOW-TEMPERATURE, LOW AND HIGH STRAIN-RATE DEFORMATION OF TI-6AL-4V
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DOI：
10.1007/bf02651653
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发表时间：
1989-05-01
期刊：
影响因子：
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通讯作者：
GRAY, GT
中科院分区：
文献类型：
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作者：
FOLLANSBEE, PS;GRAY, GT
研究了 Ti−6Al−4V 在 76 至 495 K 温度、应变速率 0.001 至 3000 s−1 之间以及压缩应变至 0.3 之间的变形行为。根据 Kocks 和 Mecking 提出的模型，对作为测试温度、应变率和预应变历史函数的屈服应力测量结果进行了分析。机械阈值应力（0 K 时的流变应力）被用作内部状态变量，并分析了该合金中存在的各种强化机制对机械阈值应力的贡献。透射电子显微镜 (TEM) 用于将变形子结构演化与本构行为关联起来。观察到 Ti-6-4 的变形子结构由准静态应变速率下 α 晶粒中的平面滑移组成。在高应变率下，除了平面滑移之外，还观察到变形孪晶。将温度提高到 495 K 可以将变形模式改变为更加随机的滑移；讨论了这对所提出的变形模型的影响。
The deformation behavior of Ti−6Al−4V at temperatures between 76 and 495 K, strain rates between 0.001 and 3000 s−1, and compressive strains to 0.3 has been investigated. Measurements of yield stress as a function of test temperature, strain rate, and prestrain history are analyzed according to the model proposed by Kocks and Mecking. The mechanical threshold stress (flow stress at 0 K) is used as an internal state variable, and the contributions to the mechanical threshold stress from the various strengthening mechanisms present in this alloy are analyzed. Transmission electron microscopy (TEM) is used to correlate deformation substructure evolution with the constitutive behavior. The deformation substructure of Ti-6-4 is observed to consist of planar slip in the α grains at quasistatic strain rates. At high strain rates, deformation twinning is observed in addition to planar slip. Increasing the temperature to 495 K is seen to alter the deformation mode to more random slip; the effect of this on the proposed deformation model is discussed.