2013 Fiscal Year Final Research Report
High elastic strain in shape memory alloys exhibiting significant lattice softening -- critical phenomenon under stress
| Project/Area Number |
23360280
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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 |
Physical properties of metals
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| Research Institution | Osaka University |
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Principal Investigator |
FUKUDA Takashi 大阪大学, 工学(系)研究科(研究院), 准教授 (50228912)
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| Co-Investigator(Kenkyū-buntansha) |
TERAI Tomoyuki (20346183)
KAKESHITA Tomoyuki (90127209)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 力学物性 / マルテンサイト変態 / 弾性変形 / 弾性異方性 / 格子軟化 / 弾性熱量効果 |
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| Research Abstract |
Elastic limits of conventional metals and alloys are smaller than 1%, although the ideal values obtained by theoretical calculations is 10% and higher. We found that Fe3Pt and Fe-Pd alloys exhibits elastic strain of more than 6% when stress is applied in the [001] direction. These alloys exhibit weak first order martensitic transformations and softening in elastic constant C' occurs on approaching the transformation temperature. We confirmed that the high elastic strain is due to continuous change in lattice parameter by neutron diffraction experiments under compressive stresses. Moreover, we found that the transformation strain, which is characteristic feature of first order martensitic transformations, disappears as the compressive stress in the [001] direction increases.
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Research Products
(24 results)
