1997 Fiscal Year Final Research Report Summary
Development of cernmics-reinforced hybrid composites with intermetallics matrix
| Project/Area Number |
08650822
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Sophia University |
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Principal Investigator |
NOZUE Akira Sophia University' Department of Mechanical Engineering, Professor, 理工学部, 教授 (80146802)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Hiroshi Sophia University, Department of Mechanical Engineering, Research Associate, 理工学部, 助手 (30154579)
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| Project Period (FY) |
1996 – 1997
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| Keywords | composites / mechanical properties |
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| Research Abstract |
Microstructual and mechanical property characteristics were investigated for three boride-dispersed composites fabricated by hot-pressing amorphous Ni_<60>Mo_<30>B_<10> powder. The firsst composite was tested in the as-hot-pressed condition ( "HP" ) whilst the other specimens were subjected to a solution treatment ( "ST" ) and further aging ( "STA" ). X-ray diffraction showed the HP and ST composites to consist of Mo_2NiB_2 particles in a Ni-rich matrix whilst the STA material contained Mo_2NiB_2 particles in a Ni_3Mo matrix. The hardness and fracture toughness decreased and increased, respectively, for the ST material compared to the HP case whilst the STA case showed increased and decreased hardness and fracture toughness, respectively, compared to the ST composite. These results were explained in terms of the brittle-ductile-brittie fracture modes for the HP-ST-STA specimens. In addition, the HP specimen showed only a 15% decrease in compressive strength at 973 K compared to 303K.
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