|Strain-Induced Ultrahard and Ultrastable Nanolaminated Structure in Nickel|
|X. C. Liu; H. W. Zhang; K. Lu
|Abstract||Heavy plastic deformation may refine grains of metals and make them very strong. But the strain-induced refinement saturates at large strains, forming three-dimensional ultrafine-grained (3D UFG) structures with random orientations. Further refinement of this microstructure is limited because of the enhanced mobility of grain boundaries. Very-high-rate shear deformation with high strain gradients was applied in the top surface layer of bulk nickel, where a 2D nanometer-scale laminated structure was induced. The strongly textured nanolaminated structure (average lamellar thickness of 20 nanometers) with low-angle boundaries among the lamellae is ultrahard and ultrastable: It exhibits a hardness of 6.4 gigapascal-which is higher than any reported hardness of the UFG nickel-and a coarsening temperature of 40 kelvin above that in UFG nickel.|
|description.department||[liu, x. c.
; zhang, h. w.
; lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [lu, k.] nanjing univ sci & technol, herbert gleiter inst nanosci, nanjing 210094, jiangsu, peoples r china.
; lu, k (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.
X. C. Liu,H. W. Zhang,K. Lu. Strain-Induced Ultrahard and Ultrastable Nanolaminated Structure in Nickel[J]. Science,2013,342(6156):337-340.
X. C. Liu,H. W. Zhang,&K. Lu.(2013).Strain-Induced Ultrahard and Ultrastable Nanolaminated Structure in Nickel.Science,342(6156),337-340.
X. C. Liu,et al."Strain-Induced Ultrahard and Ultrastable Nanolaminated Structure in Nickel".Science 342.6156(2013):337-340.
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