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A multilayer coating using electroless nickel-phosphorus (Ni–P) was applied on a twinning-induced plasticity (TWIP) steel containing nominally 25wt.% Mn and 3wt.% Al to improve the indentation hardness and corrosion properties. Microindentation tests with two different indenters, namely, a three-sided pyramidal Berkovich indenter and a ball indenter were performed to study the mechanical response,...
Nanotwinned (NT) surfaces are developed on a face-centered cubic (fcc) metal with ultrahigh hardness under cyclic loading using plastic deformation at room temperature. The hardness on NT surfaces remains constant at 7.9 and 8.5GPa indented at 1 and 7N under 0–100 cycles respectively, which are about three times that of their pristine surfaces. This is different from the NT metals and nonmetallic...
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