Characterization of the inhomogeneous strains and control of the mechanical properties in iron-based alloys showing unique shear deformation

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360283
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Tohoku University
• Principal Investigator: SUZUKI Shigeru 東北大学, 多元物質科学研究所, 教授 (40143028)
• Co-Investigator(Kenkyū-buntansha): FUKUTOMI Hiroshi 横浜国立大学, 工学研究院, 教授 (90142265) ; IMAFUKU Muneyuki 横浜国立大学, 工学研究院, 教授 (00183012) ; SATO Shigeo 茨城大学, 理工学研究科, 教授 (40509056) ; SHINODA Kozo 東北大学, 多元物質科学研究所, 准教授 (10311549) ; FUJIEDA Shun 東北大学, 多元物質科学研究所, 助教 (60551893)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 双晶誘起塑性 / 形状記憶効果 / マルテンサイト変態 / 放射光 / X線回折 / 弾性異方性

Outline of Final Research Achievements

Several kinds of Fe-Mn based alloys reveal twinning-induced plasticity and stress-induced martensitic transformation by deformation at room temperature. The deformation processes in these polycrystalline alloys showing unique shear deformation were investigated by the stress analysis of local area in the polycrystalline alloys using synchrotron radiation diffraction and the finite element simulation considering anisotropic elasticity. Furthermore, the texture of iron-based shape memory alloys is controlled by compression at high temperatures. The shape recovery of the alloys was shown to be improved by the texture control. Regarding the deformation characteristics of these alloys, the residual stresses in two-phase iron-based alloys and the stress distribution in the alloy with large anisotropic elasticity were studied. It was indicated that the anisotropic elasticity is an important role in polycrystalline iron-based alloys.

Free Research Field

材料工学