Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation

doi:10.1080/14786430802311092

IMECH-IR > 力学所知识产出(1956-2008)

	Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation
	Wei YG(魏悦广); Hutchinson JW; Hutchinson, JW (reprint author), Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA.
发表期刊	Philosophical Magazine
	2008
卷号	88 期号:30-32 页码:3841-3859
ISSN	1478-6435
摘要	Ceramic/metal interfaces were studied that fail by atomistic separation accompanied by plastic dissipation in the metal. The macroscopic toughness of the specific Ni alloy/Al2O3 interface considered is typically on the order of ten times the atomistic work of separation in mode I and even higher if combinations of mode I and mode II act on the interface. Inputs to the computational model of interface toughness are: (i) strain gradient plasticity applied to the Ni alloy with a length parameter determined by an indentation test, and (ii) a potential characterizing mixed mode separation of the interface fit to atomistic results. The roles of the several length parameters in the strain gradient plasticity are determined for indentation and crack growth. One of the parameters is shown to be of dominant importance, thus establishing that indentation can be used to measure the relevant length parameter. Recent results for separation of Ni/Al2O3 interfaces computed by atomistic methods are reviewed, including a set of results computed for mixed mode separation. An approximate potential fit to these results is characterized by the work of separation, the peak separation stress for normal separation and the traction-displacement relation in pure shearing of the interface. With these inputs, the model for steady-state crack growth is used to compute the toughness of the interface under mode I and under the full range of mode mix. The effect of interface strength and the work of separation on macroscopic toughness is computed. Fundamental implications for plasticity-enhanced toughness emerge.
关键词	Fracture Plasticity Work Of Separation Atomistic Separation Ceramic-metal Interface Strain Gradient Plasticity Thermal Barrier Systems Crack-growth Fracture Cleavage Indentation Resistance Mechanics Solids Models
学科领域	损伤、破坏机理和微结构演化
DOI	10.1080/14786430802311092
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000261804000020
关键词[WOS]	STRAIN GRADIENT PLASTICITY ; THERMAL BARRIER SYSTEMS ; CRACK-GROWTH ; FRACTURE ; CLEAVAGE ; INDENTATION ; RESISTANCE ; MECHANICS ; SOLIDS ; MODELS
WOS研究方向	Materials Science ; Mechanics ; Metallurgy & Metallurgical Engineering ; Physics
WOS类目	Materials Science, Multidisciplinary ; Mechanics ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
引用统计	被引频次：24[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/25804
专题	力学所知识产出(1956-2008)
通讯作者	Hutchinson, JW (reprint author), Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA.
推荐引用方式 GB/T 7714	Wei YG,Hutchinson JW,Hutchinson, JW . Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation[J]. Philosophical Magazine,2008,88,30-32,:3841-3859.
APA	Wei YG,Hutchinson JW,&Hutchinson, JW .(2008).Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation.Philosophical Magazine,88(30-32),3841-3859.
MLA	Wei YG,et al."Toughness Of Ni/Al2O3 Interfaces As Dependent On Micron-Scale Plasticity And Atomistic-Scale Separation".Philosophical Magazine 88.30-32(2008):3841-3859.

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