Layer thickness dependent strain rate sensitivity of Cu/amorphous CuNb multilayer

Fan, Zhe; Liu, Yue; Xue, Sichuang; Rahimi, Raheleh M.; Bahr, David F.; Wang, H.; Zhang, Xinghang

doi:10.1063/1.4980850

Cited by 27 publications

(10 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, according to [42], the SRS of C/A multilayers can be calculated as: After the new technique is validated through Cu films and returns expected SRS values, the SRS of C/A multilayers can be easily determined. Thus, in this section, the relationship between individual thickness (h), the plastic deformation mechanism, and the SRS of Cu/a-CuNb multilayers with different individual layer thickness (h, ranging from 5 to 150 nm) are systematically discussed.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Thickness-Dependent Strain Rate Sensitivity of Nanolayers via the Nanoindentation Technique

et al. 2018

View full text Add to dashboard Cite

Abstract:The strain rate sensitivity (SRS) and dislocation activation volume are two inter-related material properties for understanding thermally-activated plastic deformation, such as creep. For face-centered-cubic metals, SRS normally increases with decreasing grain size, whereas the opposite holds for body-center-cubic metals. However, these findings are applicable to metals with average grain sizes greater than tens of nanometers. Recent studies on mechanical behaviors presented distinct deformation mechanisms in multilayers with individual layer thickness of 20 nanometers or less. It is necessary to estimate the SRS and plastic deformation mechanisms in this regime. Here, we review a new nanoindentation test method that renders reliable hardness measurement insensitive to thermal drift, and its application on SRS of Cu/amorphous-CuNb nanolayers. The new technique is applied to Cu films and returns expected SRS values when compared to conventional tensile test results. The SRS of Cu/amorphous-CuNb nanolayers demonstrates two distinct deformation mechanisms depending on layer thickness: dislocation pileup-dominated and interface-mediated deformation mechanisms.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Then, the strain rate can be shown as: Finally, according to [42], the SRS of C/A multilayers can be calculated as:…”

Section: Resultsmentioning

confidence: 99%

Thickness-Dependent Strain Rate Sensitivity of Nanolayers via the Nanoindentation Technique

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Given both Cu and HEA layers deform in the Cu/HEA NLs, following the derivation by Fan et al [55], which involves the interface effect on the rate-limiting process, the m can be expressed as:…”

Section: Size-dependent Strain Rate Sensitivity Of Cu/hea Nlsmentioning

confidence: 99%

Size-dependent mechanical properties and deformation mechanisms in Cu/NbMoTaW nanolaminates

et al. 2019

View full text Add to dashboard Cite

High entropy alloys (HEAs) have attracted extensive attention due to their excellent properties in harsh environments. Here, we introduced the HEA NbMoTaW into the laminated structure to synthesize the Cu/HEA nanolaminates (NLs) with equal layer thickness h spanning from 5 to 100 nm, and comparatively investigated the size dependent mechanical properties and plastic deformation. The experimental results demonstrated that the hardness of Cu/HEA NLs increased with decreasing h, and reached a plateau at h ≤ 50 nm, while the strain rate sensitivity m unexpectedly went through a maximum with reducing h. The emergence of maximum m results from a transition from the synergetic effect of crystalline constituents to the competitive effect between crystalline Cu and amorphous-like NbMoTaW. Microstructural examinations revealed that shear banding caused by the incoherent Cu/HEA interfaces occurred under severe deformation, and the soft Cu layers dominated plastic deformation of Cu/HEA NLs with large h.

show abstract

“…Within the last decade, many studies on different materials classes, microstructures and environmental influences were reported in literature. Due to the limited amount of required material, especially the severe plastic deformation (SPD) 4 and thin film 5 , 6 communities used nanoindentation to gain information on the microstructure dependent deformation behavior of many face-centered cubic (FCC), 7 – 16 body-centered cubic (BCC), 17 – 21 and some hexagonal closed packed (HCP) 22 – 25 metals. Also the SRS of nanocomposites such as Cu-Nb, 26 nanoporous Cu and Au, 27 , 28 or nowadays high-entropy alloys (HEA) 29 , 30 were successfully investigated by nanoindentation.…”

Section: Introductionmentioning

confidence: 99%

Advanced Nanoindentation Testing for Studying Strain-Rate Sensitivity and Activation Volume

Maier–Kiener

Durst

2017

JOM

View full text Add to dashboard Cite

Nanoindentation became a versatile tool for testing local mechanical properties beyond hardness and modulus. By adapting standard nanoindentation test methods, simple protocols capable of probing thermally activated deformation processes can be accomplished. Abrupt strain-rate changes within one indentation allow determining the strain-rate dependency of hardness at various indentation depths. For probing lower strain-rates and excluding thermal drift influences, long-term creep experiments can be performed by using the dynamic contact stiffness for determining the true contact area. From both procedures hardness and strain-rate, and consequently strain-rate sensitivity and activation volume can be reliably deducted within one indentation, permitting information on the locally acting thermally activated deformation mechanism. This review will first discuss various testing protocols including possible challenges and improvements. Second, it will focus on different examples showing the direct influence of crystal structure and/or microstructure on the underlying deformation behavior in pure and highly alloyed material systems.

show abstract

Layer thickness dependent strain rate sensitivity of Cu/amorphous CuNb multilayer

Cited by 27 publications

References 44 publications

Thickness-Dependent Strain Rate Sensitivity of Nanolayers via the Nanoindentation Technique

Thickness-Dependent Strain Rate Sensitivity of Nanolayers via the Nanoindentation Technique

Size-dependent mechanical properties and deformation mechanisms in Cu/NbMoTaW nanolaminates

Advanced Nanoindentation Testing for Studying Strain-Rate Sensitivity and Activation Volume

Contact Info

Product

Resources

About