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Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals
Datye A; Li Lin; Zhang W; Wei YJ(魏宇杰); Gao YF; Pharr GM; Gao, YF
Source PublicationJOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
2016
Volume83Issue:9Pages:91003
ISSN0021-8936
Abstract

Because brittle solids fail catastrophically during normal tension and compression testing, nanoindentation is often a useful alternative technique for measuring their mechanical properties and assessing their deformation characteristics. One practical question to be addressed in such studies is the relationship between the anisotropy in the uniaxial mechanical behavior to that in the indentation response. To this end, a systematic study of the mechanical behavior the 6H polytype of a hexagonal silicon carbide single crystal (SiC-6H) was performed using standard nanoindentation methods. The indentation elastic modulus and hardness measured using a Berkovich indenter at a peak load of 500 mN varied over a wide range of crystal orientation by only a few percent. The variation in modulus is shown to be consistent with an anisotropic elastic contact analysis based on the known single crystal elastic constants of the material. The variation in hardness is examined using a single crystal plasticity model that considers the anisotropy of slip in hexagonal crystals. When compared to experimental measurements, the analysis confirms that plasticity in SiC-6H is dominated by basal slip. An anisotropic elastic contact analysis provides insights into the relationship between the pop-in load, which characterizes the transition from elasticity to plasticity during nanoindentation testing, and the theoretical strength of the material. The observations and analyses lay the foundations for further examination of the deformation and failure mechanisms in anisotropic materials by nanoindentation techniques.

KeywordNanoindentation Elastic And Plastic Anisotropy Basal Slip
DOI10.1115/1.4033790
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000382750000003
WOS Keywordnanoindentation ; elastic and plastic anisotropy ; basal slip
WOS Research AreaMechanics
WOS SubjectMechanics
Funding OrganizationThis research was supported by the U.S. National Science Foundation CMMI 0926798 (AD, LL, YFG) and DMR 1427812 (GMP), and the Natural Science Foundation of China 11425211 (YJW). Y.F.G. and G.M.P. are grateful to Dr. A.A. Wereszczak for his critical review of the manuscript.
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59767
Collection非线性力学国家重点实验室
Corresponding AuthorGao, YF
Recommended Citation
GB/T 7714
Datye A,Li Lin,Zhang W,et al. Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals[J]. JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME,2016,83(9):91003.
APA Datye A.,Li Lin.,Zhang W.,Wei YJ.,Gao YF.,...&Gao, YF.(2016).Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals.JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME,83(9),91003.
MLA Datye A,et al."Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals".JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 83.9(2016):91003.
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