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Journal of Materials Science

, Volume 29, Issue 24, pp 6513–6517 | Cite as

Readily superplastic forging at high strain rates in an aluminium-based alloy produced from nanocrystalline powders

  • K. Taketani
  • A. Uoya
  • K. Ohtera
  • T. Uehara
  • K. Higashi
  • A. Inoue
  • T. Masumoto
Papers

Abstract

A high-strain-rate superplasticity at strain rates from 10−1 to 1 s−1 (which was many orders of magnitude higher than the strain rates in typical commercial superplastic alloys) was found in a new aluminium-based crystalline alloy, as-extruded Al-Ni-Mm crystalline and Al-Ni-Mm-Zr crystalline alloys (Mm = misch metal) fabricated by warm consolidation of their amorphous or nanocrystalline powders. The alloys were developed with very fine grained structures less than 100 nm in size, with a uniform distribution of both the Al3Mm and the Al3Ni particulates which were 70 nm in diameter. As a result of these specific microstructures, these alloys have superior mechanical properties at room temperature; for example the tensile strength is greater than 800 MPa and the Young's modulus is equal to 96 GPa. As-extruded workpieces of the alloys could be forged superplastically at a commercial production speed (less than 1 s) into complicated components with a con-rod shape, which exhibited good postdeformation mechanical properties.

Keywords

Microstructure Mechanical Property Tensile Strength High Strain Commercial Production 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • K. Taketani
    • 1
  • A. Uoya
    • 1
  • K. Ohtera
    • 1
  • T. Uehara
    • 1
  • K. Higashi
    • 2
  • A. Inoue
    • 3
  • T. Masumoto
    • 3
  1. 1.Technical Research LaboratoriesYoshida Kogyo K. K.ToyamaJapan
  2. 2.College of Engineering, Department of Mechanical Systems EngineeringUniversity of Osaka PrefectureOsakaJapan
  3. 3.Institute of Materials ResearchTohoku UniversitySendaiJapan

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