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Research on the Alloying Design for High Strain Rate Superplastic Materials

Research Project

Project/Area Number 01550550
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 金属材料(含表面処理・腐食防食)
Research InstitutionOsaka University

Principal Investigator

FURUSHIRO Norio  Osaka University, Department of Materials Science and Engineering, Assistant Professor, 工学部, 講師 (50029188)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1990: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1989: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsSuperplasticity / Fine Grain / Hihg Temperature Deformation
Research Abstract

It has been expected that "High rate superplastic materials" will be developed for industrial applications. The Dorn-type equation for high temperature deformation suggests that strain rate can be increased if the grain size is decreased. This means that grain refinement can effectively establish high strain rate superplastic materials.
It is well known that a high degree of grain size refinement will result from the addition of zirconium to Al-base alloys. Powder-metallurgical processing with rapidly solidified powders is also available for the improvement of superplasticity by both the refinement of the solidified structure and the maintenance of the stable fine structure of a 7475 Al alloy during recrystallization and deformation. Therefore, P/M 7475 Al alloys containing Zr up to 0.9 wt% were selected as candidate specimens. The objective of the present project includes the clarification of the role and the effective amount of Zr to obtain high strain rate superplastic materials. As a result, the addition of 0.3%Zr or more is effective in grain refinement of the P/M 7475 Al alloy. However, alloys containing 0.7 and 0.9 wt%Zr only show superplasticity at 793K. The optimum strain rate is shifted to a higher range with increasing Zr. The alloy of 7475 Al-0.9%Zr shows the maximum elongation of 900% at the remarkably high strain rate of 3.3x10^<-1> s^<-1>.
The deformation mechanism of such high stain rate superplasticity will be discussed briefly, by considering the effect of the fine particles of Zr on superplastic behavior.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 古城 紀雄: "超塑性新時代に向けて" 軽金属. 39. 147-166 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 古城 紀雄: "アルミニウム合金の超塑性発現条件の高速化・低温化" 日本塑性加工学会平成2年度春委講演会講演論文集. 667-680 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Norio,Furushiro: "Signifiance of High Rate Superplasticity in Metallic Materials" Proc.of Symposium on Superplasticity in Metals,Ceramics and Intermtallics in MRS Spring Meeting in 1990 vol.196. 196. 249-257 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 古城 紀雄: "超塑性ー材料特性とその変形機構ー" 日本機械学会関西支部講演論文集. 914ー1. 1-6 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Norio Furushiro: "To the New Period of Superplasticity." Journal of the Japan Institute of Light Metals. vol. 39. 147-166 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Norio Furushiro: "Significance of Superplasticity at Higher Strain Rates and Lower Temperatures for Aluminun Alloys." Proceedings of the Spring Meeting of the Japan Society of Technology of Plasticity. 667-680 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Norio Furushiro: "Significance of High Rate Superplasticity in Metallic Materials." Proceedings of the Symposium on Superplasticity in Metals, Ceramics and Intermetallics in the MRS Spring Metting in 1990. vol. 196. 249-257 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Norio Furushiro: "Superplasticity -Characteristics of Superplastic Materials and the Deformation Mechanism. -" Proceedings of the Spring Meeting of the Kansai District of the Japan Institute of Mechanics. vol. 914-1. 1-6 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 古城 紀雄: "Significance of High Rate Superplasticity in Metallic Materials" Proc.of Symposium on Superplasticity in Metals,Ceramics,and Intermetallics in the MRS Spring Meeting in 1990,edt.M.J.Mayo et al.MRS,Pittsburgh,(1990). 196. 249-257 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 古城 紀雄: "7475アルミニウム合金の超塑性発現条件の高速化" 軽金属.

    • Related Report
      1990 Annual Research Report
  • [Publications] 古城 紀雄: "高速超塑性アルミニウム合金の変形機構" 金属学会誌.

    • Related Report
      1990 Annual Research Report
  • [Publications] 古城紀雄: "7475アルミニウム合金の超塑性発現条件の高速化" 軽金属.

    • Related Report
      1989 Annual Research Report
  • [Publications] 古城紀雄: "Significance of High Rate Superplasticity in Metallic Metarials" 米国MRS1990年春シンポジュ-ム(T).

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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