Indentation Testing for Materials Characterization of Crystalline Solids

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: closed (20 November 2019)

Special Issue Editor


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Guest Editor
Department of Solid Mechanics, The Royal Institute of Technology (KTH), 114 28 Stockholm, Sweden
Interests: contact mechanics; constitutive modelling; mechanics of powder-based materials; rock mechanics; mechanical analysis of indentation and scratch testing

Special Issue Information

Dear Colleagues,

Indentation or hardness testing is increasingly used for material characterization at different length scales and for very different materials. The main advantage is, of course, the simplicity of such testing, but more than that, the fact that indentation can be performed on very thin specimens, pertinent to thin films and coatings, and also on very hard materials. The disadvantage is that the mechanical problem resulting at the indentation is very complicated, and the correlation of different indentation quantities with material properties is difficult, but also necessary. This is particularly so for crystalline solids, where often, elastic and plastic deformations are of equal magnitude below the indentation contact region, in contrast to the situation for metals, where plasticity is completely dominating and elasticity is irrelevant. Accordingly, the present Special Issue concerns the correlation of indentation experiments, based on empirical, theoretical, and numerical analyses, resulting in closed form relations. Different kinds of indenter geometries, such as pyramid, conical, and spherical ones, are of interest.

Prof. Dr. Per-Lennart Larsson
Guest Editor

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Keywords

  • material characterization
  • correlation
  • indentation quantities
  • pyramid indenters
  • conical indenters
  • spherical indenters
  • closed form relations

Published Papers (2 papers)

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Research

12 pages, 3025 KiB  
Article
Hardening and Creep of Ion Irradiated CLAM Steel by Nanoindentation
by Ying Liu, Wenbin Liu, Long Yu, Lirong Chen, Haonan Sui and Huiling Duan
Crystals 2020, 10(1), 44; https://doi.org/10.3390/cryst10010044 - 17 Jan 2020
Cited by 11 | Viewed by 2557
Abstract
Ion irradiation, combined with nanoindentation, has long been recognized as an effective way to study effects of irradiation on the mechanical properties of metallic materials. In this research, hardening and creep of ion irradiated Chinese low activation martensitic (CLAM) steel are investigated by [...] Read more.
Ion irradiation, combined with nanoindentation, has long been recognized as an effective way to study effects of irradiation on the mechanical properties of metallic materials. In this research, hardening and creep of ion irradiated Chinese low activation martensitic (CLAM) steel are investigated by nanoindentation. Firstly, it is demonstrated that ion irradiation results in the increase of hardness, because irradiation-induced defects impede the glide of dislocations. Secondly, the unirradiated CLAM steel shows indentation creep size effect (ICSE) that the indentation creep strain decreases with the applied load, and ICSE is found to be associated with the variations of geometrical necessary dislocations (GNDs) density. However, ion irradiation results in the alleviation of ICSE due to the irradiation hardening. Thirdly, ion irradiation accelerates nanoindentation creep due to the large numbers of irradiation-induced vacancies whose diffusion controls creep deformation. Meanwhile, owing to the annihilation of vacancies, ion irradiation has a significant influence on the primary creep while only negligible influence has been observed for the steady-state creep. Full article
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15 pages, 6309 KiB  
Article
Bending Nanoindentation and Plasticity Noise in FCC Single and Polycrystals
by Ryder Bolin, Hakan Yavas, Hengxu Song, Kevin J. Hemker and Stefanos Papanikolaou
Crystals 2019, 9(12), 652; https://doi.org/10.3390/cryst9120652 - 07 Dec 2019
Cited by 9 | Viewed by 3462
Abstract
We present a high-throughput nanoindentation study of in situ bending effects on incipient plastic deformation behavior of polycrystalline and single-crystalline pure aluminum and pure copper at ultranano depths (< 200 nm). We find that hardness displays a statistically inverse dependence on in-plane stress [...] Read more.
We present a high-throughput nanoindentation study of in situ bending effects on incipient plastic deformation behavior of polycrystalline and single-crystalline pure aluminum and pure copper at ultranano depths (< 200 nm). We find that hardness displays a statistically inverse dependence on in-plane stress for indentation depths smaller than 10 nm, and the dependence disappears for larger indentation depths. In contrast, plastic noise in the nanoindentation force and displacement displays statistically robust noise features, independently of applied stresses. Our experimental results suggest the existence of a regime in Face Centered Cubic (FCC) crystals where ultranano hardness is sensitive to residual applied stresses, but plasticity pop-in noise is insensitive to it. Full article
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