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Microstructure design and control of intermetallics

Research Project

Project/Area Number 04239101
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Research InstitutionTohoku University

Principal Investigator

HANADA Shuji  Tohoku Univ.Inst.Mater.Res.Prof., 金属材料研究所, 教授 (10005960)

Co-Investigator(Kenkyū-buntansha) FUKUTOMI Hiroshi  Yokohama Nat.Univ.Fac.Eng.Assoc.Prof., 工学部, 助教授 (90142265)
AMEYAMA Kei  Ritsumeikan Univ.Fac.Sci.Eng.Assoc.Prof., 理工学部, 助教授 (10184243)
SAKA Hiroyasu  Nagoya Univ.Fac Eng.Prof., 工学部, 教授 (90023267)
AOKI Kiyoshi  Kitami Inst.Tech.Fac.Eng.Prof., 工学部, 教授 (70124542)
NEMOTO Minoru  Kyushu Univ.Fac.Eng.Prof., 工学部, 教授 (90005265)
時実 正治  立命館大学, 理工学部, 教授 (50066528)
Project Period (FY) 1992 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥140,300,000 (Direct Cost: ¥140,300,000)
Fiscal Year 1994: ¥29,800,000 (Direct Cost: ¥29,800,000)
Fiscal Year 1993: ¥49,500,000 (Direct Cost: ¥49,500,000)
Fiscal Year 1992: ¥61,000,000 (Direct Cost: ¥61,000,000)
KeywordsNi_3Al / TiAl / Nb_3Al / microstructure control / isothermal forging / mechanical alloying / HIP / strength / Ni_3A1 / TiA1 / NiA1 / Nb_3A1 / 延性 / 金属間化合物 / 組織 / NiAl
Research Abstract

1. Microstructure control of Ni_3Al polycrystals
Microstructures of Ni_3Al ternary alloys were controlled to consist of equiaxd, recrystallized grains by isothermal forging under appropriate deformation conditions and ductility at room temperature was investigated. Ductilities of Ni_3Al alloyed with ternary elements of more than 2% are explained by ordering energy, and ductilization of Ni_3Al microalloyed with Zr or Hf is ascribed to scavenging of impurities. The latter conclusion is consistent with the fact that high purity Ni_3Al prepared by using zone-refined Ni and Al in a ultra-high vacuum exhibits ductility.
2. Microstructure control of TiAl
Utra-fine grained TiAl was obtained by mechanical alloying in H_2 followed by hot pressing or mechanical alloying in Ar followed by HIPing. Ultra-fine grained TiAl deforms under lower stress compared with coarse grained TiAl. Ultra-fine grained TiAl+Ti_3Al exhibits superplasticity and heat treatment after superplastic deformation improves high temperature strength.
Compressive deformation at high temperatures products deformation texture for TiAl and for lamellar structured TiAl/Ti_3Al.
Ternary additions to TiAl Produce precipitates consisting of intermetallic compounds, carbides or nitrides, thereby increasing high temperature strength.
3. Microstructure control of Nb_3Al
Nb_3Al+Nb two phase alloys were prepared by isothermal forging of ingots, HIP consolidation of alloyed powders or reactive sintering in hot pressing. High temperature strength and fracture toughness at room temperature are improved by controlling alloy composition and microstructure.

Report

(4 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • 1992 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] A.Chiba,SHanada and S.Watanabe: "Effect of ternary additions on the intrinsic ductility of Ni_3Al alloys" MRS Symp.Proc.High-Temperature Ordered Intermetallic Alloys. 288. 843-848 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] W.H.Tian.C.S.Han and N.Nemoto: "Dislocation-Particle interactions in precipitation Strengthened Ni_3Al and NiAl" Structural Intermetallics. 551-560 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Saka and Y.M.Zhu: "Dislocation structures in β-brass deformed cyclically at 200°C" Phil.Mag.A69. 1155-1166 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Aoki,Y.Ito and T.Masumoto: "Preparation of namocrystalline TiAl Powder by HDDR process using mechanical griding in a hydrogeu atmosphere" Scripta Metall.31. 1271-1275 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Ameyama,H.Uno and M.Tokizane: "Superplastic behavior of Ti-48 at % Al two-phase titanium cluminide compacts made from mechanically alloyed powder" Intermetallics. 2. 315-319 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 福富洋志,大須賀義裕,野本明義: "集合組織に基づくγ-TiAl金属間化合物における動的再結晶機構の解析" 日本金属学会誌. 59. 1215-1221 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Chiba, S.Hanada and S.Watanabe: "Effect of ternary additions on the intrinsic ductility of Ni_3Al alloys" Mater.Res.Soc.Symp.Proc.eds.J.Horton et al.vol.288. 843 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] W.H.Tian, C.S.Han and M.Nemoto: "Dislocation-particle interactions in precipitation strengthened Ni_3Al and NiAl" Struct.Intermet., eds.R.Darolia et al.TMS. 551 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Saka and Y.M.Zhu: "Dislocation structures in beta-brass deformed cyclically at 200゚C" Phil.Mag.A69. 1155 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Aoki, Y.Ito and T.Masumoto: "Preparation of nanocrystalline TiAl powder by the HDDR process using mechanical griding in a hydrogen atmosphere" Scripta Metall.Mater. 31. 1271 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] K.Ameyama, H.Uno and M.Tokizane: "Superplastic behavior of Ti-48at.%Al two-phase titanium aluminide compacts made from mechanically alloyed powder" Intermetallics. 2. 315 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] A.Chiba,S.Hanada and S.Watanabe: "Ductility of recrystallized Zr-doped Ni_3A1 alloys fabricated by isothermal hot-forging" Mater.Trans.,JIM. 35. 286-290 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] A.Chiba,S.Hanada,S.Watanabe et al.: "Relation between ductility and grain boundary character distribution in Ni_3A1" Acta Metall.Mater.42. 1733- (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Ishikawa,K.Aoki and T.Masumoto: "Strength and ductility of Ni_3A1 alloyed with boron and substiunonal elements" High-Temperature Ordered Intermetallic Alloys VI. (in press).

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Aoki,Y.Itoh and T.Masumoto: "Preparation of nanocrystalline TiA1 powder by the HDDR process using mechanical grinding in a hydrogen atmosphere" Scripta Metall.Mater. 31. 1271-1275 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] K.Ameyama,H.Uno and M.Tokizane: "Superplastic behaviour of Ti-48at%A1 two-phase titanium aluminide compacts made from mechanically alloyed powder" Intermetallics. 2. 319-315 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] M.Nemoto,W.H.Tian and K.Hayashi: "Phase decomposition and deformation of L1_2-ordered Co-rich Co_3Ti" High-Temperature Ordered Intermetallic Alloys VI. (in press).

    • Related Report
      1994 Annual Research Report
  • [Publications] S.Hanada,Y.Murayama and Y.Abe: "High Temperature Deformation of Nb_3Al Alloys" Intermetallics. (in press).

    • Related Report
      1993 Annual Research Report
  • [Publications] W.H.Tian,Z.Horita,T.Sano and M.Nemoto: "An application of the Differential X-ray Absorption Method to Thickness Measurement in Precipitate-Containing Ni_3(Al,Ti)and TiAl Compounds" Philosophical Magazine. B67. 811-822 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] A.Matsumoto and H.Saka: "Strength Anomaly in Beta-Brass Single Crystals Deformed in Direct Shear" Philosophical Magazine. A,67. 217-229 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Aoki,K.Ishikawa and T.Masumoto: "Ductilization Effects of Boron on Ternary Ni_3Al Compounds" Proc.3rd Japan International SAMPE Symposium. 1159-1164 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] H.Fukutomi,K.Aoki,S.Takagi,M.Nobuki et al.: "Formation of Texture during High Temperature Deformation of Ti-50.3mol%Al" Intermetallics. 2. 37-42 (1994)

    • Related Report
      1993 Annual Research Report
  • [Publications] K.Ameyama,K.Isonishi,T.Wajata,T.Fujii et al.: "Superplastic TiAl-Ti_3Al Two-Phase Compacts Made from PREP Powders" Proc.3rd Japan International SAMPE Symposium. 1513-1518 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] Y.Murayama,S.Hanada,K.Obara: "Dynamic recrystallization of Nb_3Al produced from alloy powder" Materials Science and Engineering,. A159. 173-180 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] W.H.Tian,Z.Horita,T.Sano,M.Nemoto: "An Application of the Differential X-Ray Absorption Method to Thickness M" Philosophical Magazine. 67. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] A.Matsumoto,H.Saka: "Strength Anomaly in β-CuZn Single Crystals deformed in direct Shear" Philosophical Magazine. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] T.Wajata,K.Isonishi,K.Ameyama,M.Tokizane: "Superplasticity in TiAl and Ti_3Al Two Phase Material made from PREPed Powder" ISIJ International. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Ch.Hartig,H.Fukutomi,H.Mecking,K.Aoki: "Texrure and Microstructure of Ti-49 at % Al after Dynamic Recrystallization and Annealing" ISIJ International. 33. 313-320 (1993)

    • Related Report
      1992 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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