Journal
METALS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/met10010073
Keywords
high-pressure surface rolling; copper; grain refinement; microhardness
Funding
- National Natural Science Foundation of China [51371128]
- Research Funds for the Top-Class Universities of Hubei Province [03080107]
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Pure copper was subjected to high-pressure surface rolling (HPSR) to obtain a surface gradient layer. Effects of HPSR parameters on the surface microstructure and microhardness of Cu were investigated by using optical microscopy, transmission electronic microscopy, X-ray diffraction, and the microhardness test. The HPSR surface layer has a gradient microstructure consisting of increasingly refined grains with decreasing depth from the treated surface (DFS). The thicknesses of the refined surface layer can be up to similar to 1.8 mm, and the grain size of the topmost surface is down to similar to 88 nm, depending on the HPSR parameters including pressure, time, and temperature. Microhardness of HPSR samples increases with decreasing DFS, with a maximum of similar to 2.4 times that of the undeformed matrix. The present results indicated that HPSR could be an effective method for the production of a mm-thick surface layer on Cu with gradient microstructure and property.
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