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Development of Cr_2Nb Intermetallic Compounds with High Fracture Toughness as Ultra High Temperature Structural Materials

Research Project

Project/Area Number 07555495
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section試験
Research Field Structural/Functional materials
Research InstitutionTohoku University

Principal Investigator

TAKASUGI Takayuki  Tohoku University, Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (20108567)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Mitsuhiko  Miyagi National College of Technology, Professor, 教授 (40042254)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
KeywordsIntermetallic compound / Laves alloy / Fracture toughness / Ultra high temperature structural materials / Cr_2Nb / Alloy design
Research Abstract

In this study, to develop the Cr_2Nb intermetallics which can be used at 1473K and the enough fracture toughness at ambient temperature, the mechanical properties of the alloys prepared by alloy design, microstructural control and advanced process were investigated. The following results were obtained.
1) Structures of Cr_2Nb Laves alloy were observed by x'-ray and (HR) TEM.High temperature compressive deformation behavior was investigated, and discussed in correlation with the activated dislocation structures. Consequently, the deformation begins at 1473K,and accomplished by an activation of the Schockley partials of 1/2 <011> dislocations, or the dynamic recrystallization.
2) The isothermal phase diagrams of Cr-Nb-V,Cr-Nb-Mo and Cr-Nb-W ternary alloy systems at 1623K were clarified. It was shown that the C15 Cr_2Nb Laves phases are directly equilibrated with bcc solid solution without forming any ternary intermediate compounds.
The effect of ternary alloying elements such as V,Mo, W and Ti on the alloying behavior, the lattice properties and the phase stability of the C15 Cr_2Nb was investigated. It was shown that the solubility of V and W are more than 10at%, that of W is about 5at%, and Ti forms the continuous solid solution range toward to Cr_2Ti. The ALCHEMI determined that V occupies the sublattice of Cr, Mo, Ti and W do the sublattices of Nb. Also, TEM observation on the microstructure of the alloys with ternary elements suggested that V enhance the stability of C15 structure but Mo, W and Ti reduce the stability of the C15 structure.
4) The mechanical properties of the ternary alloys consisting of the Cr_2Nb and the bcc solid solution were investigated by compression test in a wide range of test temperature. High fracture toughness at low temperature was observed on the alloys consisting of the C15 phase and Cr-rich bcc solid solution, while high strength at high temperature was observed on the alloys consisting of the C15 phase and Nb-rich bcc solid solution.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] M.Yoshida: "Defomation microstructures of C15 Cr_2Nb Laves phase Intormetallic compounds" MRS Symp.Proe,Publication. 364. 1395-1400 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Microstructure and high-temporature deformation of the C15 NbCr_2-based Laves intermetallics in Nb-Cr-V alloy system" J.of Materials Research. 10. 2463-2470 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Defomability improvement in C15 NbCr_2 intermetallics by addition of ternary elemenls" Acta Materialia. 44. 699-706 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "High temperature deformation and ternary alloying of NbCr_2 Laves intermetallics" Design Fundamentals of High Temperature Composites,Intermetallics,and Metal-Ceramics Systems. 235-249 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "Phase relation and microstructure of Nb-Cr-V and Nb-Cr-Mo alloy systems" Materials Science and Engineering A. 224. 69-76 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "High-temperature deformation of the NbCr_2-based Lave intemetallics in Nb-Cr-V and Nb-Cr-Mo alloy systems" Materials Science and Engineering A. 224. 77-86 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "Phase relation and microstracture of NbCr_2 Lave intermetallics in Ternary Nb-Cr-X alloy systems" MRS Symp.Proc.Publications. 460. 659-664 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "The Alloying eflect on the high temperature deformation of Laves phase NbCr_2 intermetallic compound" Materials Science and Engineering A. 234-236. 873-876 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Microstructure and high temperature daformation of in-situ NbCr_2-based intermetallic compounds" Proc.of International Corferewe on Intermetallic and their composites. (印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "The effect of ternary addition on stmicture and slaility of NbCr_2 Laves phases" (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "Deformation Microstructures of C15 Cr_2Nb Laves Phase Intermatallic Compounds" High Temperature Ordered Intermetallic Alloys VI,MRS Symp.Proc.Publications. vol.364. 1395-1400 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Microstructure and High-Temperature Deformation of the C15 NbCr_2-based Laves Intermetallics in Nb-Cr-V Alloy System" J.of Materials Research. No.10. 2463-2470 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Deformability Improvement in C15 NbCr_2 Intermetallics by Addition of Ternary Elements" Acta Materialia. 44 No.2.699-706 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "High Temperature Deformation and Ternary Alloying of NbCr_2 Laves Intermetallics" Design Fundamentals of High Temperature Composites, Intermatallics, and Metal-Ceramics Systems, TMS,ed.by R.Y.Lin et al.235-249 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "Phase Relation and Microstructure of Nb-Cr-V and Nb-Cr-Mo Alloy Systems" Mater.Sci.and Engng.A. 224 Nos.1-2. 69-76 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "High-Temperature Deformation of the NbCr_2-based Laves Intermetallics in Nb-Cr-V and Nb-Cr-Mo Alloy Systems" Mater.Sci.and Engng.A. 224 Nos.1-2. 77-86 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "Phase Relation and Microstructure of NbCr_2 Laves Intermetallics in Ternary Nb-Cr-X Alloy Systems" High-Temperature Ordered Intermetallic Alloys VII,MRS Symp.Proc.Publications. vol.460. 659-664 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] M.Yoshida: "The Alloying Effect on the High Temperature Deformation of Laves Phase NbCr_2 Intermetallic Compound" Materials Science and Engineering. A234-236. 873-876 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Microstructure and High Temperature Deformation of in-situ NbCr_2-based Intermetallic Compounds" Proc.of International Conference on Intermetallic and Their Composites held at Wollongong, Australia. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "The Effect of Ternary Addition on Structure and Stability of NbCr_2 Laves Phases" Journal of Materials Research. 12 (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.Takasugi: "Deformability Improvement on C15MoCr_2 Intermetallics by Addition of Ternary Elements" Acta Materialia. 44, 2. 699-706 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Takasugi: "High Temperature Deformation and Ternary Alloying of NbCr_2 Laves Intermetallics" Design Fundamentals of High Temperature Comportes, Intermetallics, and Metal-Ceramics Systems. 235-249 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Yoshida: "Phase Relation and Microstructure of Nb-Cr-V and Nb-Cr-Mo Alloy Systems" Materials Science and Engineering A. (印刷中).

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Yoshida: "High Temperature Deformation of the NbCr_2 based Laves Intermetallics in Nb-Cr-V and Nb-Cr-Mo Alloy Systems" Materials Science and Engineering A. (印刷中).

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Takasugi: "The Effect of Ternary Addition on Structure and Stability of NbCr_2 Laves Phases" J.of Materials Research. (印刷中).

    • Related Report
      1996 Annual Research Report
  • [Publications] T. Takasugi: "High Temperetue Mechanical Paperties of C15 Lavos Phase Cr_2Nb Intermetallics" Moterials Scienre and Engineering A. 192/193. 805-810 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] M. Yoshida: "Deformatlon Micnostructures of Cr5 Cr_2Nb Laves Phase Intemetallic Cempounds" MRS Symp Proc Publications. 364. 1395-1400 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Takasugi: "Microstructure and High-Temperature Peformatian of the C15 NbCr_2-based Laves Intermetallics on Nb-Cr V Allog System" J.of Materials Researcn. 10. 2463 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T. Takasugi: "Deformability Improveneut in C15 NbCr_2 Intermetallics by Addition of Ternary Elenents" Acta Materialia. 44. 699-706 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Takasugi: "High Temperature Deformatian and Ternary Alloying of NbCr_2 Laves Infermetallics" Pesign Fundamentals of High Tenperature Composile,Intermefallics and Metal-Ceramics Systems. 235-249 (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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