Anisotropic brittle-ductile transition of monocrystalline sapphire during orthogonal cutting and nanoindentation experiments

Philipp Maas , Yuta Mizumoto , Yasuhiro Kakinuma , Sangkee Min
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引用次数: 13

Abstract

Single-crystal sapphire is utilized as a high-performance engineering material, especially in extreme and harsh environments. However, due to its extreme hardness and brittleness, the machinability of sapphire is still a challenge. By means of nanoindentation and plunge-cut experiments, the anisotropic brittle-ductile transition of the prismatic M-plane and rhombohedral R-plane is examined by analyzing crack morphologies and the critical depth-of-cut (CDC). The experimental results of the nanoindentation tests are correlated to the plunge-cut experiment. Both the prism plane and the rhombohedral crystal plane exhibit a two-fold symmetry of ductility with various crack patterns along the machined grooves. The direction-dependent plasticity of the hexagonal sapphire crystal is mainly connected to a twinning process accompanied by slip dislocation.

正交切割和纳米压痕实验中单晶蓝宝石的各向异性脆-韧转变
单晶蓝宝石是一种高性能的工程材料,特别是在极端和恶劣的环境中。然而,由于其极高的硬度和脆性,蓝宝石的可加工性仍然是一个挑战。通过纳米压痕和冲切实验,通过分析裂纹形貌和临界切割深度(CDC),研究了棱柱形m面和菱形r面各向异性的脆性-韧性转变。纳米压痕实验结果与冲切实验结果具有一定的相关性。棱柱面和菱面体晶面均表现出双重对称的延性,沿加工槽方向有不同的裂纹形态。六边形蓝宝石晶体的定向塑性主要与伴随滑移位错的孪晶过程有关。
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