Thermally stable nanomultilayer films of Cu/Mo

Srinivasan, Dheepa; Sanyal, Sankar P.; Corderman, Reed R.; Subramanian, P. R.

doi:10.1007/s11661-006-0072-4

Cited by 18 publications

(8 citation statements)

References 30 publications

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“…Figure 6 B uses the same colors of each data point to attribute the datum to a specific NMM structure (bcc/fcc, fcc/fcc, hcp/hcp, etc.) from the present study as well as the other previously identified studies from literature [ 17 , 18 , 19 , 20 , 52 , 63 , 65 , 66 , 67 , 68 , 69 ]. For a given subset of NMM structures (e.g., fcc/bcc), a more pronounced trend of decreasing normalized layer breakdown temperature with increasing surface energy mismatch is evident.…”

Section: Resultssupporting

confidence: 81%

“…Colors of the data points correspond to NMM alternating structure (e.g., bcc/fcc, fcc/bcc, etc.). from this study and other studies [ 17 , 18 , 19 , 20 , 52 , 63 , 65 , 66 , 67 , 68 , 69 ].…”

Section: Figuresupporting

confidence: 70%

“…This is an important distinction because many NMM studies focus on equiatomic, or repeated layer thickness, systems [ 22 , 23 , 26 , 28 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ] or are concerned with the evolution of microlaminates, where layer thicknesses are >100 nm [ 61 , 62 ]. It has been shown that an unequal alloying content affects transformation behavior [ 63 ] and nanoscale layer thicknesses affect the diffusion pathways necessary for transformation [ 64 ]. Thus far in this manuscript, we have stressed the importance of understanding the links between initial characteristics (coherency, local and global composition, lattice mismatch, initial grain size, and material selection) and the final transformed microstructure.…”

Section: Resultsmentioning

confidence: 99%

“…To visualize experimental observations over many binary NMM systems, the simplified contributions of geometric and energetic drivers are illustrated in Figure 6 . In these plots, NMM structures from the present study and from literature across many material systems [ 17 , 18 , 19 , 20 , 52 , 63 , 65 , 66 , 67 , 68 , 69 ] are presented and are tabulated in Supplementary Table S1 . All systems shown are binary, non-equiatomic (>60 at.% base element) nano-multilayered films subjected to heat treatments.…”

Section: Resultsmentioning

confidence: 99%

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An Overview of Nano Multilayers as Model Systems for Developing Nanoscale Microstructures

2022

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The microstructural transformations of binary nanometallic multilayers (NMMs) to equiaxed nanostructured materials were explored by characterizing a variety of nanoscale multilayer films. Four material systems of multilayer films, Hf-Ti, Ta-Hf, W-Cr, and Mo-Au, were synthesized by magnetron sputtering, heat treated at 1000 °C, and subsequently characterized by transmission electron microscopy. Binary systems were selected based on thermodynamic models predicting stable nanograin formation with similar global compositions around 20–30 at.%. All NMMs maintained nanocrystalline grain sizes after evolution into an equiaxed structure, where the systems with highly mobile incoherent interfaces or higher energy interfaces showed a more significant increase in grain size. Furthermore, varying segregation behaviors were observed, including grain boundary (GB) segregation, precipitation, and intermetallic formation depending on the material system selected. The pathway to tailored microstructures was found to be governed by key mechanisms and factors as determined by a film’s initial characteristics, including global and local composition, interface energy, layer structure, and material selection. This work presents a global evaluation of NMM systems and demonstrates their utility as foundation materials to promote tailored nanomaterials.

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Section: Resultssupporting

confidence: 81%

Section: Figuresupporting

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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An Overview of Nano Multilayers as Model Systems for Developing Nanoscale Microstructures

2022

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“…The hardness of the Cu layer near the interface increases because its tiny structure hinders dislocation movement, and the hardness of the Mo end reaches the highest value due to work hardening caused by high densification dislocation. [95,96]…”

Section: Dislocations Strengtheningmentioning

confidence: 99%

Strengthening Mechanisms and Thermal Models of Chemically Incompatible Metals (Mo/W–Cu): A Review

et al. 2023

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Molybdenum (Mo) and tungsten (W) are elements of the same family with similar properties, and both of them have high hardness, mechanical strength, and electrochemical corrosion properties, [1] which are widely used in the research and application of hightemperature and arc ablation-resistant materials. [2,3] Mo-Cu and W-Cu alloys are typical pseudoalloys. [4] There is almost no reaction between tungsten and copper, molybdenum and copper in the sintering process, and almost no intermetallic compounds are produced, which is due to the great differences in crystal structure and physical properties between tungsten and copper particles, molybdenum and copper particles. [5,6] W-Cu alloys and Mo-Cu alloys are widely used in microelectronics applications, aerospace technology, and military equipment because of their excellent electrical conductivity, excellent thermal conductivity, excellent arc resistance, flame retardant of fused joints, and other attractive properties. [1,[7][8][9] The addition of Cu and other high thermal conductivity (TC) metals can make it have a thermal expansion coefficient (CTE) close to silicon and high TC. [7][8][9][10][11][12][13] When the service temperature exceeds the melting point of Cu, Cu in the material can absorb a lot of heat through the transformation of physical states such as liquefaction and evaporation, and play a role of sweating and cooling. [9] As a result, Mo/W-Cu composites (Mo-Cu and W-Cu) have excellent high-temperature resistance and better ablation resistance than pure metal Mo/W. [14][15][16][17] Mo/W-Cu composites have excellent physical and mechanical properties, but their applications are severely limited by density and interface problems. Densification and interface strengthening can improve mechanical, thermal, and electrical properties of Mo/W-Cu composites. The electrical and thermal properties of Mo/W-Cu composites are closely related to the addition of alloying elements, [6] densification of green compacts, [18,19] thermal cycle, [20] and applied pressure in the case of hot pressing. [21] At present, the study in the densification of Mo/W-Cu composites is almost about the influence of a single factor, and there is no comprehensive summary of the densification process. In the experimental process, there are also considerable difficulties in fully characterizing the microstructure, atomic structure, and chemical properties of the interface, which can be described by creating molecular dynamics models. However, there are few researches on molecular dynamics simulation of Mo/W-Cu composite.Mo/W-Cu composites are an attractive radiator material due to their combinational properties of Mo/W and Cu. [22] However, Mo/W-Cu composites materials are widely distributed in

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Effect of layer thickness on the mechanical behaviour of oxidation-strengthened Zr/Nb nanoscale multilayers

et al. 2017

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The effect of bilayer thickness (L) reduction on the oxidation-induced strengthening of Zr/Nb nanoscale metallic multilayers (NMM) is investigated. Zr/Nb NMMs with L = 10 and 75 nm were annealed at 350 ºC for a time ranging between 2 and 336 h and the changes in structure and deformation behaviour were studied by nano-scale mechanical testing and analytical electron microscopy. Annealing led to transformation of the Zr layers into ZrO 2 after a few hours, while the Nb layers oxidised progressively at a much slower rate. The sequential oxidation of Zr and Nb layers was found to be key for the oxidation to take place without rupture of the multi-layered structure and without coating spallation in all cases. However, the multilayers with the smallest bilayer thickness (L=10 nm) presented superior damage tolerance and therefore structural integrity during the oxidation process, while for L=75 nm the volumetric expansion associated with oxidation led to the formation of cracks at the interfaces and within the ZrO 2 layers. As a result, the nanoindentation hardness increase after annealing was significantly higher for the nanolaminate with L = 10 nm. Comparison between nanoindentation and micropillar compression behaviour of the oxidized NMMs demonstrate that the hardness increase upon oxidation arises from the contribution of the residual stresses associated with the volume increase due to oxidation and to the higher strength of the oxides.

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Thermally stable nanomultilayer films of Cu/Mo

Cited by 18 publications

References 30 publications

An Overview of Nano Multilayers as Model Systems for Developing Nanoscale Microstructures

An Overview of Nano Multilayers as Model Systems for Developing Nanoscale Microstructures

Strengthening Mechanisms and Thermal Models of Chemically Incompatible Metals (Mo/W–Cu): A Review

Effect of layer thickness on the mechanical behaviour of oxidation-strengthened Zr/Nb nanoscale multilayers

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