| Budget Amount *help |
¥45,630,000 (Direct Cost: ¥35,100,000、Indirect Cost: ¥10,530,000)
Fiscal Year 2012: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2011: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2010: ¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2009: ¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
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| Research Abstract |
Structure and tensile plastic deformation behaviors of electrodeposited nanocrystalline Ni-W alloys have been examined. By controlling the surface roughness of the Cu-substrate, the Ni-W alloys with mesoscale Ni-segregated network structure has been prepared. Tensile strengths of the Ni-14～18 at. % W alloys were attained to about 3 GPa with the total strains of 3～5 % containing the large plastic strain of about 0.5～3 %. These results have suggested that the Ni-segregated mesoscale structure is effective for improvement of the tensile plasticity. Work hardening was also observed. By using the FIB-milling technique, local grain growth was observed near the fractured surface. It may be suggested that the local grain growth is occurred during local plastic deformation, resulting the work hardening according to the inverse Hall-Petch strengthening law.
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