Analysis of hardness–tensile strength relationships for electroformed nanocrystalline materials

Brooks, I.; Ping, Lin; Palumbo, G.; Hibbard, G.D.; Erb, U.

doi:10.1016/j.msea.2008.02.015

Cited by 105 publications

(37 citation statements)

References 25 publications

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“…Although the available data points are rather limited, it is plain from these results that the H v /σ uts ratio is often seen at a value of 3, whereas the ratio of H v /σ y maintains above 4, i.e., a modified Tabor equation with a C value of 4 or above would be more reasonable for nc metals. 53,54 This result is consistent with those reported by Brooks et al 55 Using eqn. (4), Ludwig equation, HP relationship and the materials parameters for nickel shown in Table 5, 56 we have numerically calculated the H v /σ y ratio as a function of grain size (10-100 nm, i.e., different σ y values) and n, which is given by…”

Section: (4)supporting

confidence: 93%

Controlling factors in tensile deformation of nanocrystalline cobalt and nickel

et al. 2012

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In an effort to understand and enhance the tensile ductility of truly nanocrystalline metals, we have investigated and compared the mechanical behavior, especially the tensile behavior, of hcp nanocrystalline cobalt (~20 nm) and fcc nanocrystalline nickel (~28 nm). Although both materials exhibit obvious plasticity in tension, their uniform tensile ductility, tensile elongationto-failure, and fracture behavior are drastically different. In-situ synchrotron x-ray diffraction and ultra-small angle x-ray scattering reveal distinct deformation disparity in terms of residual strain development, texture evolution, nanovoid formation, and subsequent strain hardening and strain rate hardening behavior. The dependence of tensile property on the strain rate and temperature is examined and discussed. Factors that influence the strength and ductility of nanocrystalline metals are considered and prioritized according to the current findings. A new Hall-petch relationship is proposed for nanocrystalline nickel.

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Section: (4)supporting

confidence: 93%

Controlling factors in tensile deformation of nanocrystalline cobalt and nickel

et al. 2012

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“…Different types of particles with a variety of properties, e.g., oxides (Al 2 O 3 , ZrO 2 ), carbides (SiC, WC, SiC), nitrides (Si 3 N 4 ) and borides (TiB 2 , ZrB 2 ), have been commonly used to reinforce matrices of microcrystalline metals or alloys [2,3]. Composites with a nanocrystalline metallic matrix are characterized by significantly greater hardness and strength than their microcrystalline counterparts, due to the high grain boundary densities leading to enhanced or novel properties [4]. The selection of a matrix and ceramic dispersive phase is mainly determined by the intended use of resulting composites.…”

Section: Introductionmentioning

confidence: 99%

Ni–W/ZrO2 nanocomposites obtained by ultrasonic DC electrodeposition

et al. 2015

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“…Similarly discouraging tensile ductilities were reported in a number of subsequent studies [e.g. Much of this disappointing mechanical behaviour was likely the result of processing flaws, such as hydrogen pit holes and co-deposited bath impurity particulate, introduced into the materials during electrodeposition in small-scale plating systems [22]. In addition, two of these studies had clearly demonstrated the presence of sample size effects, where greater failure strengths were seen in smaller coupons [20,21].…”

Section: Nanocrystalline Electrodepositionmentioning

confidence: 77%

Metal/Metal Nanocrystalline Cellular Composites

2009

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Nanocrystalline electrodeposition can be used to reinforce conventional metallic microtruss materials and conventional metal foams, creating new types of metal/metal cellular hybrids in which the mechanical performance is controlled by an interconnected network of nanocrystalline tubes. This approach takes advantage of the large strength increase that can be obtained by grain size reduction to the nm-scale and the fact that the electrodeposited material is optimally positioned away from the neutral bending axis of the composite cellular struts or ligaments. This article presents an overview of the potential for structural reinforcement of bending-dominated and stretching-dominated cellular architectures by nanocrystalline electrodeposition.

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Analysis of hardness–tensile strength relationships for electroformed nanocrystalline materials

Cited by 105 publications

References 25 publications

Controlling factors in tensile deformation of nanocrystalline cobalt and nickel

Controlling factors in tensile deformation of nanocrystalline cobalt and nickel

Ni–W/ZrO2 nanocomposites obtained by ultrasonic DC electrodeposition

Metal/Metal Nanocrystalline Cellular Composites

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