Mechanical Characterization of PM2000 Oxide‐Dispersion‐Strengthened Alloy by High Temperature Nanoindentation

Hangen, Ude; Chen, Chun-Liang; Richter, Asta

doi:10.1002/adem.201500095

Cited by 18 publications

(10 citation statements)

References 34 publications

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“…Nanoindentation -whereby an indenter of a specific geometry is driven into the surface of a material under an applied load -has been been widely used to determine the mechanical properties of thin films, either in the form of hard coatings [2,3] or modified surface layers [4,5]. The application of this technique and related nanomechanical testing at elevated temperatures is a relatively recent, but increasingly popular field, with indentation temperatures and publications rapidly increasing year-on-year [6][7][8][9][10][11][12][13][14][15][16]. It is also a potential breakthrough in the development of high temperature materials.…”

Section: Introductionmentioning

confidence: 99%

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

Gibson

Schröders

Zehnder

et al. 2017

Extreme Mechanics Letters

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Section: Introductionmentioning

confidence: 99%

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

Gibson

Schröders

Zehnder

et al. 2017

Extreme Mechanics Letters

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“…The data obtained (Figure a) indicate that the penetration depth decreases with increase in T s . This is due to the fact that the measured indenter penetration will be greater in the case of less dense packed or loosely packed films . The penetration depth for Ga 2 O 3 films deposited at 500–700 °C is almost the same with negligible difference of ±2 nm.…”

Section: Resultsmentioning

confidence: 96%

“…However, nano‐indentation measurements are well known, reliable and provides a simple and quick method for obtaining information about the mechanical properties of thin films . The reproducibility is good, but, when the ratio of indentation depth to the film thickness ( d / t ) exceeds a critical value, then the measured mechanical properties are going to be influenced by the substrate material and it is no longer characteristics of the coating . Therefore, one needs to identify the penetration depth by monitoring the phenomena with respect to indentation load.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical Properties of Nanocrystalline and Amorphous Gallium Oxide Thin Films

Battu

Ramana

2018

Adv Eng Mater

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Nanocrystalline and amorphous Ga2O3 films (%200 nm) with variable structural quality are produced by sputter-deposition by varying the substrate temperature (T s ¼ 25-700 C). The effect of T s is significant on the microstructure and mechanical behavior of Ga 2 O 3 films. The variation in mechanical behavior studied by nano-indentation and nano-scratch testing reveal distinct trends, which are directly related to the structure and morphology of Ga 2 O 3 films. All the Ga 2 O 3 films deposited at T s < 500 C are amorphous; the amorphous-to-crystalline transformation occurs at T s ¼ 500 C. Ga 2 O 3 films deposited at T s ! 500 C are nanocrystalline, β-phase. The corresponding mechanical characteristics, namely the hardness (H) and elastic modulus (E r ), show a strong correlation with structural characteristics. The H and E r increases from 17 to 27 GPa and 250 to 290 GPa, respectively, with increasing T s from 25 to 700 C. The plasticity index, which is the ratio of H/E r , is almost constant for the Ga 2 O 3 films. The strain-rate sensitivity measurements performed to determine the applicability in practical applications indicate the best performance of size controlled, nanocrystalline Ga 2 O 3 films, which can be mechanically regarded as nano-composite structures. The mechanical characteristics, scratch behavior, and strain rate sensitivity indicate the role of microstructure on the mechanical performance of Ga 2 O 3 films.Gallium oxide exhibits polymorphism. The α, β, γ, δ, and e phases of Ga 2 O 3 are widely known. [16,18,[25][26][27] Among these polymorphs, monoclinic β-Ga 2 O 3 is thermally stable with a band gap of %5 eV and high breakdown field 8 MV cm À1 . [28] β-Ga 2 O 3 exhibits n-type conductivity, which is related to donor centers involving oxygen vacancies and/or impurities. The high thermal stability of β-Ga 2 O 3 (melting point %1900 C) is quite useful in the design and development of high-temperature chemical sensors, which can be readily used in automotive industry and power plants. [2] Furthermore, the high-temperature stability coupled with deep ultraviolet transparency makes Ga 2 O 3 based materials as the potential candidates for chemical sensors in extreme environments and transparent electrodes in UV optoelectronics, photonics, and thin-film transistors. [29][30][31] However, in all these applications, fundamental understanding of the structure, thermodynamic conditions, and mechanical characteristics is the key to achieving enhanced device performance.

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“…So far, plenty of experimental works have been performed in the field of high temperature nano-indentation [5][6][7][8][9][10], and some principal features observed in these experiments indicate that the well-known indentation size effect, that is, the increase of materials hardness with decreasing indentation depth, still exists even when the testing temperature T increases up to T m /3 (T m is the melting temperature) for most materials [11][12][13][14][15]. However, when compared with the test performed at room temperature, both the increasing rate of materials hardness and ultimate bulk hardness are noticed to get weakened at elevated temperatures [9,15].…”

Section: Introductionmentioning

confidence: 99%

Hardness-Depth Relationship with Temperature Effect for Single Crystals—A Theoretical Analysis

Líu

Xiao

2020

Crystals

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In this paper, a mechanistic model is developed to address the effect of temperature on the hardness-depth relationship of single crystals. Two fundamental hardening mechanisms are considered in the hardness model, including the temperature dependent lattice friction and network dislocation interaction. The rationality and accuracy of the developed model is verified by comparing with four different sets of experimental data, and a reasonable agreement is achieved. In addition, it is concluded that the moderated indentation size effect at elevated temperatures is ascribed to the accelerated expansion of the plasticity affected region that results in the decrease of the density of geometrically necessary dislocations.

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Mechanical Characterization of PM2000 Oxide‐Dispersion‐Strengthened Alloy by High Temperature Nanoindentation

Cited by 18 publications

References 34 publications

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

On extracting mechanical properties from nanoindentation at temperatures up to 1000 °C

Mechanical Properties of Nanocrystalline and Amorphous Gallium Oxide Thin Films

Hardness-Depth Relationship with Temperature Effect for Single Crystals—A Theoretical Analysis

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