Strengthening mechanism of super-hard nanoscale Cu/Al multilayers with negative enthalpy of mixing
Source abstract
Abstract
We present unusual high hardness (up to 7.7 GPa) achieved in Cu/Al multilayers relative to monolithic Cu and Al films (∼2 GPa and ∼1 GPa, respectively). Nanotwins and stacking faults (SFs) were proposed to be the main contributors of hardness enhancement, especially when h < 5 nm. Using molecular dynamics simulations of deposition, we demonstrated that intermixing near Cu/Al interface was paramount in stabilizing the SFs in both Cu and Al layers. Our experimental results indicated that the high strength caused by layer intermixing was in sharp contrast to the general belief that only sharp interface structures could strengthen the multilayers.
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Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Microstructure and mechanical properties · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Xi’an Jiaotong University 1 State Key Laboratory for Mechanical Behavior of Material, School of Materials Science and Engineering, , Xi’an 710049, China
Xi’an Jiaotong University 2 State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, , Xi’an 710049, China
Xi’an Jiaotong University 3 MOE Key Laboratory for Multifunctional Materials and Structures, School of Aerospace, , Xi’an 710049, China
Funding
National Natural Science Foundation of China
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