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Abstract
The surface of an annealed Cu plate was processed by a high pressure surface rolling (HPSR) process. It is found that the deformed surface layer in the Cu plate after HPSR can be as thick as 2 mm and is characterized by a gradient microstructure, with grain sizes varying from the nanoscale in the topmost surface to the microscale in the bulk. The hardness varies from 1.37 GPa at the topmost surface to about 0.6 GPa in the coarse-grained matrix. The results of the investigation demonstrate that the HPSR process shows good potential for the generation of thick gradient microstructures on the surface of bulk metallic materials.
Highlights
In the past two decades, various surface deformation techniques, such as surface mechanical attrition treatment (SMAT) [1, 2], surface mechanical grinding treatment (SMGT) [3, 4] and high energy shotpeening [5], have been developed to generate surface gradient layers in metallic materials
It is found that the deformed surface layer in the Cu plate after high pressure surface rolling (HPSR) can be as thick as 2 mm and is characterized by a gradient microstructure, with grain sizes varying from the nanoscale in the topmost surface to the microscale in the bulk
It is clearly seen in the low magnification electron channeling contrast (ECC) image that a deformed layer of about 2 mm in thickness is formed on the coarse grained substrate without a clear interface between the deformed layer and the matrix
Summary
In the past two decades, various surface deformation techniques, such as surface mechanical attrition treatment (SMAT) [1, 2], surface mechanical grinding treatment (SMGT) [3, 4] and high energy shotpeening [5], have been developed to generate surface gradient layers in metallic materials. It is found that the deformed surface layer in the Cu plate after HPSR can be as thick as 2 mm and is characterized by a gradient microstructure, with grain sizes varying from the nanoscale in the topmost surface to the microscale in the bulk. The results of the investigation demonstrate that the HPSR process shows good potential for the generation of thick gradient microstructures on the surface of bulk metallic materials.
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