An investigation of resolved shear stress on activation of slip systems during ultraprecision rotary cutting of local anisotropic Ti-6Al-4V alloy: Models and experiments
An investigation of resolved shear stress on activation of slip systems during ultraprecision rotary cutting of local anisotropic Ti-6Al-4V alloy: Models and experiments
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DOI：
10.1016/j.ijmachtools.2018.07.001
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发表时间：
2018-11
影响因子：
14
通讯作者：
Zejia Zhao;S. To
中科院分区：
文献类型：
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作者：
Zejia Zhao;S. To
采用电脉冲处理（EPT）技术制备了具有局部各向异性特征的Ti-6Al-4V合金，并将其用于超精密旋转金刚石切削，探讨了合金的变形机理。两种不同取向的片状马氏体α导致局部各向异性行为。本文引入临界分辨切应力（CRSS）来研究六方密排马氏体的滑移模式。还提出了一个几何和物理模型，用于计算各种滑动系统上的分解剪应力。结果表明，当分解剪应力等于或大于CRSS时，在某些方向上会发生滑动。切削力随马氏体取向的变化而变化，这可能是由于片状α相尺寸和不同滑移方向的协调或竞争共同作用的结果。
Ti-6Al-4V alloy with local anisotropic characteristics is produced by electropulsing treatment (EPT) and used in ultraprecision rotary diamond cutting to explore the deformation mechanism of the alloy. Two different orientations of lamellar martensite α give rise to the local anisotropic behaviour. Critical resolved shear stress (CRSS) is introduced in this paper to investigate the slip modes of the hexagonal closest packing martensite. A geometrical and physical model is also proposed for calculation of resolved shear stresses on various slipping systems. The results show that glide occurs in some certain directions on the condition that resolved shear stress equals or exceeds the CRSS. The cutting force varies with martensitic orientations, which is supposedly due to the combined effects of lamellar α phase sizes and the coordination or competition of diverse slipping directions.