Fabrication of bulk nanocrystalline Fe alloys with high strength and high tensile ductility by electrodeposition

2015 Fiscal Year Final Research Report

• Project/Area Number: 25390031
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials engineering
• Research Institution: Osaka Prefecture University
• Principal Investigator: Yorinobu Takigawa 大阪府立大学, 工学(系)研究科(研究院), 准教授 (70382231)
• Research Collaborator: MATSUI Isao ; KAWAKATSU Tomo ; MORI Hiroki ; OGURA Yu
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 電解析出法 / ナノ結晶材料 / バルク / 延性 / 結晶成長 / 粒界偏析

Outline of Final Research Achievements

Bulk nanocrystalline Fe-Ni, Fe-Ni-C and Fe-Mn alloys were fabricated by an electrodeposition. Fe-Ni alloys exhibit high strength of 1.5GPa and large tensile ductility of 15%. The intrinsic ductility of these alloys was explored, taking into consideration the relationship between ductility and the orientation index or contents of grain boundary embrittlement element. An applying multiple regression analysis provides accurate predictions for the ductility. The analysis of this study points to the potency that the intrinsic ductility of nanocrystalline Fe–Ni alloys is higher than that of the present highest value of 24%.
Fe-Ni-C alloys with high hardness are also fabricated. The addition of propionic acid to the deposition bath could release the excess grain boundary defects of electrodeposited alloys in as-deposited states. Fe-Mn alloys without voids and cracks were also fabricated.

Free Research Field

材料プロセス