Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals

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	Extraction of Anisotropic Mechanical Properties From Nanoindentation of SiC-6H Single Crystals
	Datye A; Li L; Zhang W; Wei YJ(魏宇杰); Gao YF; Pharr GM; Wei YJ(魏宇杰)
刊名	JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
	2016
通讯作者邮箱	pharr@utk.edu
卷号	83 期号:9 页码:91003
关键词	nanoindentation elastic and plastic anisotropy basal slip
ISSN号	0021-8936
通讯作者	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.
产权排序	[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
中文摘要	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.
分类号	一类
类目[WOS]	Mechanics
研究领域[WOS]	Mechanics
关键词[WOS]	nanoindentation ; elastic and plastic anisotropy ; basal slip
收录类别	SCI ; EI
原文出处	http://dx.doi.org/10.1115/1.4033790
语种	英语
WOS记录号	WOS:000382750000003
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/59767]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	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,2016,83(9):91003.
APA	Datye A.,Li L.,Zhang W.,魏宇杰.,Gao YF.,...&Wei YJ.(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.