2005 Fiscal Year Final Research Report Summary
Alloy Design and Microstructural Control in Ni-based Multi-Intermetallic In-situ Composite Materials
| Project/Area Number |
15360373
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Osaka Prefecture University |
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Principal Investigator |
TAKASUGI Takayuki Osaka Prefecture University, Graduate School of Engineering, Department of Materials Science, Professor, 工学研究科, 教授 (20108567)
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| Co-Investigator(Kenkyū-buntansha) |
KANENO Yasuyuki Osaka Prefecture University, Graduate School of Engineering Department of Materials Science, Research Associate, 工学研究科, 助手 (50214482)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Intermetallic compound / Superalloy / Microstructural stability / Thermal stability / Multi-phase alloy / Ni_3Al / Geometrically close packed phase / Ni_3V |
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| Research Abstract |
Using Ni_3Al-Ni_3Nb-Ni_3Ti, Ni_3Al-Ni_3Ti-Ni_3V, Ni_3Al-Ni_3Nb-Ni_3V and Ni_3Si-Ni_3Nb-Ni_3Ti pseudo-ternary alloy systems, the development of multi-intermetallic in-situ composite materials as a candidate of new high-temperature structural materials was performed on alloy design and microstructure control. The following results were obtained from the present study.
(1)It was found dual multi-phase microstructure composed of L1_2 and D0_<22> phases was developed in Ni_3Al-Ni_3Ti-Ni_3V and Ni_3Al-Ni_3Nb-Ni_3V pseudo-ternary alloy systems, and had extremely fine microstructure and highly coherent interface structures not only between the upper- and lower-multi-phase microstructures but also between the constituent phases.
(2)In Ni_3Si-Ni_3Nb-Ni_3Ti pseudo-ternary alloy system, the precipitation phenomenon due to the solubility change by temperature between two constituent phases, L1_2 and D0_<24> was found to occur and consequently the precipitation strengthening was applicable to the present alloy system.
(3)The Ni_3Al-Ni_3Ti-Ni_3V and Ni_3Al-Ni_3Nb-Ni_3V pseudo-ternary alloys displayed the positive temperature dependence of the flow strength and also extremely high high-temperature strength accompanied with reasonable tensile ductility over a wide range of temperatures. In addition, the creep rate and creep rupture life were identical to or superior to those of the most superalloys or advanced superalloys.
(4)For the Ni_3Al-Ni_3Ti-Ni_3V pseudo-ternary alloys, fabrication process such as conventional melting, hot-forging and unidirectional solidification processes were found to be applicable, consequently resulting in the mass production, reliability and low-cost.
(5)It was shown that the developed multi-intermetallic in-situ composite materials are strongly promising as new high-temperature structural materials.
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Research Products
(27 results)
