Activation analysis of deformation in evaporated molybdenum thin films

Yoder, Karl; Elmustafa, A. A.; Lin, J. C.; Hoffman, R. A.; Stone, Donald S.

doi:10.1088/0022-3727/36/7/318

Cited by 31 publications

(8 citation statements)

References 48 publications

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“…Furthermore, the high entropic effect, sluggish diffusion, and lattice distortion in RHEA films contribute to the measured high hardness and Young’s modulus . The hardness of the CuMoTaWV RHEA film is found to be higher than that of refractory metals, such as W, Ta, and Mo thin films with a hardness of 14, 11.6, and 11.8 GPa, respectively. − In general, refractory metals are found to be harder than transition metals, such as Ni and Cu, with a hardness of 6.4 and 6 GPa, respectively, due to their strong bonding and crystal structure. , The hardness of CuMoTaWV was found to be even higher than those of previously reported bulk RHEAs, such as TiHfZrTaNb, with a hardness of 4.9 GPa, and RHEA films, such as NbMoTaW, TaNbHfZr, TiTaHfNbZr, and HfNbTiVZr, with a hardness of 16, 15, 12.5, and 9.2 GPa, respectively.…”

Section: Resultsmentioning

confidence: 95%

Synthesis and Mechanical Characterization of a CuMoTaWV High-Entropy Film by Magnetron Sputtering

Alvi

Jarząbek

Kohan

et al. 2020

ACS Appl. Mater. Interfaces

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Development of high-entropy alloy (HEA) films is a promising and cost-effective way to incorporate these materials of superior properties in harsh environments. In this work, a refractory high-entropy alloy (RHEA) film of equimolar CuMoTaWV was deposited on silicon and 304 stainless-steel substrates using DC-magnetron sputtering. A sputtering target was developed by partial sintering of an equimolar powder mixture of Cu, Mo, Ta, W, and V using spark plasma sintering. The target was used to sputter a nanocrystalline RHEA film with a thickness of ∼900 nm and an average grain size of 18 nm. X-ray diffraction of the film revealed a body-centered cubic solid solution with preferred orientation in the (110) directional plane. The nanocrystalline nature of the RHEA film resulted in a hardness of 19 ± 2.3 GPa and an elastic modulus of 259 ± 19.2 GPa. A high compressive strength of 10 ± 0.8 GPa was obtained in nanopillar compression due to solid solution hardening and grain boundary strengthening. The adhesion between the RHEA film and 304 stainless-steel substrates was increased on annealing. For the wear test against the E52100 alloy steel (Grade 25, 700–880 HV) at 1 N load, the RHEA film showed an average coefficient of friction (COF) and wear rate of 0.25 (RT) and 1.5 (300 °C), and 6.4 × 10–6 mm3/N m (RT) and 2.5 × 10–5 mm3/N m (300 °C), respectively. The COF was found to be 2 times lower at RT and wear rate 102 times lower at RT and 300 °C than those of 304 stainless steel. This study may lead to the processing of high-entropy alloy films for large-scale industrial applications.

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Section: Resultsmentioning

confidence: 95%

Synthesis and Mechanical Characterization of a CuMoTaWV High-Entropy Film by Magnetron Sputtering

Alvi

Jarząbek

Kohan

et al. 2020

ACS Appl. Mater. Interfaces

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“…12 13 Indentation creep has been studied by a number of researchers. [14][15][16][17][18][19][20] The most common method of measuring creep is to maintain the applied force at a constant maximum value and measure the change in depth of the indenter as a function of time. The relative change of the indentation depth is referred to as the "creep" of the specimen material.…”

Section: Nanoindentationmentioning

confidence: 99%

Correlation Between the Mechanical Properties and Deformation Microstructure of Ni Films

Wang¹,

Zhang²,

Yao³

et al. 2014

mater focus

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The evolution of texture and mechanical properties of electrodeposited nickel films under tensile deformation has been investigated under different elongations. Analysis of the surface morphology, the deformation texture and the mechanical properties using scanning electron microscopy (SEM), the X-ray diffraction (XRD) and nano-indentation has been conducted, revealing that there were only two main texture components Ni (111) and Ni (200) in the nickel film during the elongation. With increase of the tensile strain, the surface becomes rougher with generation of microcracks. The hardness (from 9.36 GPa to 6.13 GPa) and the Young's modulus (from 242.51 GPa to 116.23 GPa) decrease with the attenuation of the Ni (111) textures while the value of creep increases with the strain.

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“…By the aid from the grain growth inhibitor like ZrC particles located at the grain boundaries, the creep of the Mo alloy with 0.8 mol% dispersed zirconium carbide (ZrC) and with the 300 nm average grain size under 1500°C indicated the superplasticity behavior ( n = 2.44) . At near ambient temperature, the nanoindentation creep data of Mo thin film (30‐40 nm grain size) showed that the creep exponent was close to 6.67—the value related to the thermally activated glide‐controlled creep …”

Section: Introductionmentioning

confidence: 99%

Oxidation effects on spark plasma sintering of molybdenum nanopowders

et al. 2018

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Surface-oxidized molybdenum nanopowders are compacted by spark plasma sintering (SPS). The oxide impurity behavior is analyzed under various sintering temperatures. The densification mechanism of the nanopowders with a melted oxide phase is identified in situ by regression analysis of the experimental data on the temperature-dependent porosity change and on the SPS multistep pressure dilatometry. To increase the density of the compacted pellets, the nanopowders with the oxide phase are consolidated by SPS using the two in situ oxide removal methods: carbothermic reduction and particle surface cleaning by the electric current flow through the powders. The advantages and disadvantages of these methods in terms of the density, grain size, and mechanical properties of the final products are discussed. K E Y W O R D Sdensification mechanism,

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Activation analysis of deformation in evaporated molybdenum thin films

Cited by 31 publications

References 48 publications

Synthesis and Mechanical Characterization of a CuMoTaWV High-Entropy Film by Magnetron Sputtering

Synthesis and Mechanical Characterization of a CuMoTaWV High-Entropy Film by Magnetron Sputtering

Correlation Between the Mechanical Properties and Deformation Microstructure of Ni Films

Oxidation effects on spark plasma sintering of molybdenum nanopowders

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