Abstract
The flat surface of a Cu plate was processed by incremental frictional sliding at liquid nitrogen temperature. The surface treatment results in a hardened gradient surface layer as thick as 1 mm in the Cu plate, which contains a nanostructured layer on the top with a boundary spacing of the order of 100 nm. The boundary spacing increases with increasing distance from the surface, and is accompanied with a decrease in hardness from 2179±31MPa in the topmost surface layer to 568±10 MPa in the undeformed matrix.
Highlights
Surface modification of metallic materials by introducing a gradient nanostructured surface layer is an effective approach to enhance the strength and service lifetime of materials, as demonstrated in many investigations over the past decades [1]
The flat surface of a Cu plate was processed by incremental frictional sliding at liquid nitrogen temperature
A technique called incremental frictional sliding is developed and applied to process a Cu plate, which results in thick surface layers with a gradient nanostructure
Summary
Surface modification of metallic materials by introducing a gradient nanostructured surface layer is an effective approach to enhance the strength and service lifetime of materials, as demonstrated in many investigations over the past decades [1]. The flat surface of a Cu plate was processed by incremental frictional sliding at liquid nitrogen temperature. The surface treatment results in a hardened gradient surface layer as thick as 1 mm in the Cu plate, which contains a nanostructured layer on the top with a boundary spacing of the order of 100 nm.
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