|本期目录/Table of Contents|

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

《纳米技术与精密工程》[ISSN:1672-6030/CN:12-1351/O3]

期数:
2018年3期
页码:
157-171
栏目:
出版日期:
2018-09-15

文章信息/Info

Title:
Anisotropic brittle-ductile transition of monocrystalline sapphire during orthogonal
cutting and nanoindentation experiments
作者:
Philipp Maas a YutaMizumotoa Yasuhiro Kakinuma a Sangkee Min b*
Author(s):
 Philipp Maas a YutaMizumotoa Yasuhiro Kakinuma a Sangkee Min b*
a Department of System Design Engineering, Faculty of Science & Technology, Keio University, 3-14-1 Hiyoshi, Kouhoku, Yokohama, Kanagawa 223-0061, Japan
b Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 University Avenue, Madison, WI 53706, USA
关键词:
-
Keywords:
Sapphire
Anisotropy
Brittle-ductile transition
Orthogonal cutting
分类号:
-
DOI:
https://doi.org/10.1016/j.npe.2018.09.005
文献标识码:
A
摘要:
-
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.

参考文献/References

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备注/Memo

备注/Memo:
 * Corresponding author.
E-mail address: sangkee.min@wisc.edu (S. Min).
https://doi.org/10.1016/j.npe.2018.09.005
1672-6030/? 2018 Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
更新日期/Last Update: 2018-12-27