2015 Fiscal Year Final Research Report
Strengthening and deformation rate-controlling mechanism of an alloy consisting of dual ductile phases at high temperatures
| Project/Area Number |
25420693
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | Nihon University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
TAKAGI Hidenari 日本大学, 工学部, 専任講師 (40409040)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | 延性二相合金 / 計装化押込み試験 / クリープ特性値 / クリープ構成式 / FEシミュレーション |
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| Outline of Final Research Achievements |
The high-temperature deformation of the ductile two-phase alloy and the respective single-phase alloys are investigated using indentation testing technique and a computational model. Experimental results show that double logarithmic plots of the creep rate and the indentation pressure for the single-phase alloy fall on a straight line. The slope corresponds to the stress exponent for creep, n1 and n2, respectively. On the other hand, all the data for the two-phase alloy lie between those for the single-phase alloys, but they are not on a straight line. The stress exponent n of the two-phase alloy changes from n1 to n2 with increasing the creep rate. Computational results show that the n value of the alloy depends on not only those of the respective phases, but also the load condition. When the creep rate is very low, the hard phase is responsible for the majority of the load, and the creep mechanism of the hard phase has a strong influence on the creep behavior of the two-phase alloy.
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| Free Research Field |
材料強度物性学
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