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Title:
Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals
Author: Datye A; Li Li(李理); Zhang W; Wei YJ(魏宇杰); Gao YF; Pharr GM
Source: JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
Issued Date: 2016
Volume: 83, Issue:9, Pages:91003
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.
Keyword: nanoindentation ; elastic and plastic anisotropy ; basal slip
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Gao, YF ; Pharr, GM (reprint author), Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA. ; Gao, YF ; Pharr, GM (reprint author), Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA.
Correspondent Email: pharr@utk.edu
DOI: 10.1115/1.4033790
Related URLs: 查看原文
DOC Type: 期刊论文
WOS Subject: Mechanics
WOS Subject Extended: Mechanics
WOS Keyword Plus: nanoindentation ; elastic and plastic anisotropy ; basal slip
WOS ID: WOS:000382750000003
ISSN: 0021-8936
Funder: This 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.
Rank: [Datye, Amit; Li, Lin; Zhang, Wei; Gao, Yanfei; Pharr, George M.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA; [Wei, Yujie] Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China; [Gao, Yanfei; Pharr, George M.] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
Department: LNM微结构计算力学(筹)
Classification: 一类
Ranking: False
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Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/59767
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
Datye A,Li L,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,2016-01-01,83(9):91003.
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