Investigation of the cutting mechanisms and the anisotropic ductility of monocrystalline sapphire
Investigation of the cutting mechanisms and the anisotropic ductility of monocrystalline sapphire
复制标题
DOI：
10.1016/j.cirp.2017.04.018
复制
发表时间：
2017-01-01
影响因子：
4.1
通讯作者：
Min, Sangkee
中科院分区：
文献类型：
--
作者：
Mizumoto, Yuta;Maas, Philipp;Min, Sangkee
本研究以单晶蓝宝石进行切入实验，从晶体各向异性的观点探讨其脆性与韧性变形机制。加工蓝宝石基板的各向异性变形行为表现在临界切削深度和不同的裂纹形态。基于一个适合于实验过程的分解应力模型，计算了加权分解应力，并讨论了低对称性六方晶体结构的特点决定的脆韧性转变的趋势。菱形孪晶被认为是占主导地位的脆韧性转变。(C)2017由Elsevier Ltd代表CIRP发布。
In this study, plunge-cut tests are conducted on single-crystal sapphire to investigate the brittle and ductile deformation mechanisms from the viewpoint of crystal anisotropy. The anisotropic deformation behaviour of the machined sapphire substrate manifests itself in the critical depth of cut and the diverse crack morphologies. Based on a resolved stress model that is adapted to the experimental procedure, weighted resolved stresses are computed, and the tendency of brittle-ductile transition depending on the peculiarities of the low-symmetry hexagonal crystal structure is discussed. Rhombohedral twinning is assumed to dominate the brittle-ductile transition. (C) 2017 Published by Elsevier Ltd on behalf of CIRP.