1991 Fiscal Year Final Research Report Summary
Development of High Performance FRM using Superplasticity
Grant-in-Aid for General Scientific Research (B)
|Allocation Type||Single-year Grants |
|Research Institution||Tokyo Metropolitan University |
NISHIMURA Hisashi Tokyo Metropolitan University, Faculty of Technology, Professor, 工学部, 教授 (70087170)
WAKAYAMA Shuichi Tokyo Metropolitan University, Faculty of Technology, Assistate Professor, 工学部, 講師 (00191726)
MANABE Ken-ichi Tokyo Metropolitan University, Faculty of Technology, Associate Professor, 工学部, 助教授 (10145667)
|Project Period (FY)
1992 – 1994
|Keywords||FRM / Superplasticity / Deformation Processing / Composites / Powder Metallurgy / High Performance Materials|
This project is the research on the fabrication technique of the MMC by the solid diffusion with high productivity and efficiency, and on the secondary formability (bending and deep drawint ) of the MMC using a superplasticity.
(1) The fabrication of the MMC by hot pressing.
The fabrication technique of MMC was developed using superplastic metal as matrix. Since superplastic metal has low flow stress and superior diffusion bondability, both load and temperature can be low at the fabrication of materials by the hot press equipment. Then the fabricated materials had sufficient strength and elongation.
(2) Bending formability of superplastic metal matrix composites.
The bending formability of the SiC or B continuous fiber reinforced composites, which matrix were superplastic aluminum (SPA) of zinc (SPZ) alloys, were investigated. Then the bending deformatin was successful without fiber breakings. where the minimum bending radius was 6 mm as equal to that of a single fiber. Although superplasticity of the matrix metal was effective for the deformation processing, it was harmful for the spring-back behavior and the strength after the deformation.
(3) Deep drawing and bulge deformation of the superplastic metal matrix composites.
In order to investigate the cavitation of the particle or whisker reinforced MMC, the specific gravity was measured during tensile of compressive deformation. The cavitation was remarkable in uni- or biaxial tensile deformation, however it was negligible in compression. The limit formability of the MMC was investigated during deep drawing and bulge deformation, than the limit drawing ratio was 2.1 (Vf=10%) or 1.9 (Vf=20%), which is equivalent to that of commercial aluminum alloy sheets. Furthermaore, it was made clear that the initiation and growth of cavity was critical for the limit formability, and that the isostatic pressure was effective for the enhancement of the limit.
Research Products (15results)