Controlled indentation: A general approach to determine mechanical properties of brittle materials

Zeng, Kaiyang; Söderlund, E.; Giannakopoulos, A.E.; Rowcliffe, D. J.

doi:10.1016/1359-6454(95)00196-4

Cited by 106 publications

(44 citation statements)

References 44 publications

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“…The nano-indentation tester could measure elastic modulus as well as hardness of various materials, 4,5) and the data obtained for W, Ni and other materials are in good agreement with those reported in Handbook. 5,6) Additionally, since the nano-indentation testing can be performed in the region smaller than 1 µm 2 , we believe that it is possible to estimate the hardness and elastic modulus of each constituent phase in the composites of a fine microstructure, such as Nb SS /Nb 5 Si 3 in-situ composites.…”

Section: Introductionsupporting

confidence: 71%

Mechanical Properties of Nb-18Si-5Mo-5Hf-2C <I>In-Situ</I> Composite Prepared by Arc-Casting Method

et al. 2002

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Niobium-base in-situ composite, Nb-18Si-5Mo-5Hf-2C (in mol%), was fabricated by arc-casting method and heat-treated at 2070 K for 20 h in vacuum. The microstructure is composed of Nb solid solution (Nb SS ) matrix phase and secondary phase of Nb 5 Si 3 . The Nb 5 Si 3 was found to have two kinds of structure: one is the α phase reported in the Nb-Si binary phase diagram and the other is a hexagonal phase with Mn 5 Si 3 -type structure. To evaluate the mechanical properties of the composite, nano-indentation hardness tests and tensile tests were conducted. The hardness and elastic modulus at ambient temperature were evaluated using nano-indentation hardness tester and the tensile properties were examined by an Instron-type materials testing machine at temperatures of 300, 1470, 1570, 1670 and 1770 K, and at an initial strain rate of 1 × 10 −4 s −1 . The hardness and elastic modulus of the Nb SS phase are 480 GPa and 170 GPa and those of the silicide are 1480 GPa and 380 GPa. The composite exhibited the excellent ultimate tensile strength of 450 MPa at 1470 K, and the brittle to ductile transition temperature is between 1470 and 1570 K. The fracture behavior of the in-situ composite is complex, however, involving cleavage of the Nb 5 Si 3 , Nb SS /Nb 5 Si 3 interface separation, ductile rupture of the Nb SS and correlations of these.

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Section: Introductionsupporting

confidence: 71%

Mechanical Properties of Nb-18Si-5Mo-5Hf-2C <I>In-Situ</I> Composite Prepared by Arc-Casting Method

et al. 2002

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“…A typical measurement via a nanoindenter can record displacement h from the surface of the material and load P with resolutions in sub-nanometer and sub-mN, respectively. From the recorded P-h relations, various characteristics of the individual phases in a composite material, such as the elastic modulus, hardness, the strainhardening exponent, yield strength, fracture toughness, and residual stress 1,2) can be directly estimated. Among these properties, the elastic modulus, E, and hardness, H, are obtainable without complicated testing apparatus and spending.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a lot of studies concerned with the evaluation of E and H of bulk materials and thin films by nanoindenter have been reported in recent years. [3][4][5] The micro-Vickers hardness, Hv, which represents the reliable hardness of metals and ceramic materials determined in the micro-scale regime, is one of the most widely used hardness standards. Therefore, comparison with the hardness data obtained by micro-Vickers tests and nano-indentation tests has significant importance, because when a clear relationship between both hardness values is developed, the nanoindentation tests can provide a hardness evaluation that is compatible to micro-Vickers hardness, on nanoscale-size phases.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Technique of the Hardness and Elastic Modulus of Materials with Fine Microstructures

2003

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Quantitative data of mechanical properties such as hardness, H, and elastic modulus, E, are required for the constituent phases of an alloy in the process of alloy design. To meet the needs, the evaluation technique of H and E of phases in composites through nanoindentation tests is proposed. Moreover, H and E of Nb solid solution (Nb SS ) and niobium silicide (Nb 5 Si 3 ) phases in Nb-base in-situ composites were characterized by the proposed method. To clarify the quantitative relationship between the nanohardness, Hn, and the micro-Vickers hardness, Hv, nanoindentation tests were carried out on the Hv Standard blocks with Hv100, 500, 700, 900 and 1600, under a wide range of applied loads from 0.1 to 40 mN. As a result, it was clarified that Hv and Hn are linearly related under each applied load. Therefore, Hv could be estimated from Hn by applying the linear relation. It was also confirmed that the elastic modulus is almost independent of the applied loads. Therefore, the elastic modulus, E, could also be directly estimated by nanoindentation tests with Poisson's ratios of tested materials. Hv and E of Nb SS and Nb 5 Si 3 in the Nb-base composites determined by the method show good agreement with the reported values for both phases. Accordingly, it is possible to conclude that the proposed method is useful to quantitatively evaluate the hardness and elastic modulus of constituent phases in a composite.

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“…In most of the previous studies using nanoindentation test to characterize mechanical properties of materials, attentions are only paid on the unloading segment because the hardness and the Young's modulus are usually extracted from the analysis of the unloading behavior based on the well-known Oliver-Pharr (OP) method [1]. The loading segment is occasionally observed mainly aiming at providing experimental supports to the theoretical analyses of the load-displacement relationship [2,3]. Some studies are also concentrated on the holding segment, but the purpose of such studies is to observe the nanoindentation creep behavior [4,5].…”

Section: Introductionmentioning

confidence: 99%

An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic

Zhang

Shao

et al. 2016

J Adv Ceram

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An abnormal displacement change observed during the holding period in nanoindentation tests on a zirconia dental ceramic was reported in this paper. It was found that, at the initial stage of the holding period, the measured displacement versus time curves were similar in shape with the typical indentation creep curve reported in previous studies. As the holding lasted for long time, however, an evident reduction in displacement was observed for tests with high loading rate, implying that another unknown process, which might result in a decrease in displacement, would co-exist with creep during holding period. Elastic recovery was suggested to be one of the possible sources for such a displacement reduction. An empirical method was also proposed to eliminate the effect of this displacement reduction on the determination of hardness and Young's modulus.

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Controlled indentation: A general approach to determine mechanical properties of brittle materials

Cited by 106 publications

References 44 publications

Mechanical Properties of Nb-18Si-5Mo-5Hf-2C <I>In-Situ</I> Composite Prepared by Arc-Casting Method

Mechanical Properties of Nb-18Si-5Mo-5Hf-2C <I>In-Situ</I> Composite Prepared by Arc-Casting Method

Evaluation Technique of the Hardness and Elastic Modulus of Materials with Fine Microstructures

An abnormal displacement change during holding period in nanoindentation tests on zirconia dental ceramic

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