2012 Fiscal Year Final Research Report
Synthesis of High Strength Nano-Micro Metallic Materials by Controlling Mesoscale Structure
| Project/Area Number |
21246112
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | University of Hyogo |
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Principal Investigator |
YAMASAKI Tohru 兵庫県立大学, 大学院・工学研究科, 教授 (30137252)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Kazutaka 宇部工業高等専門学校, 機械工学科, 教授 (10156862)
KIKUCHI Takeyuki 兵庫県立大学, 大学院・工学研究科, 准教授 (50316048)
MIURA Eri 兵庫県立大学, 大学院・工学研究科, 准教授 (70315258)
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| Co-Investigator(Renkei-kenkyūsha) |
YOKOYAMA Yoshihiko 東北大学, 金属材料研究所, 准教授 (00261511)
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| Project Period (FY) |
2009 – 2012
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| Keywords | 結晶・組織制御 / ナノ結晶合金 / 金属ガラス |
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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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