High strength nanocrystalline Mg-Al-Ca alloys produced by rapidly solidified powder metallurgy processing

Yoshihito Kawamura, Kentaro Hayashi, Junichi Koike, Akira Kato, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalConference article

32 Citations (Scopus)

Abstract

Nanocrystalline magnesium alloy having high specific tensile strength, high Young's modulus, high elevated-temperature tensile strength, high-strain-rate superplasticity and high corrosion resistance has been developed by rapidly solidified powder metallurgy (RS P/M) processing in amorphous forming Mg70Al20Ca10 alloy. The density of the nanocrystalline RS P/M alloy was 1.80 g/cm3. The compressive yield strength and plastic strain that were dependent on the consolidation temperature were in the ranges of 570 to 930 MPa and 0.5 to 9.2%, respectively. The tensile yield strength, plastic elongation and Young's modulus of the RS P/M alloy extruded at 673 K were 600 MPa, 1.0% and 50 GPa, respectively. The specific tensile yield strength was four times as high as that of a commercial AZ91-T6 alloy. The RS P/M alloy exhibited excellent elevated-temperature yield strength that was 360 MPa at 473 K. The RS P/M alloy also exhibited superplasticity at a high strain rate of 1.1×l00 s-1 and at 723 K. It is expected that the Mg70Al20Ca10 RS P/M alloy is applied in some fields that requires simultaneously the high specific strength at ambient and elevated temperatures, high workability and high corrosion resistance.

Original languageEnglish
Pages (from-to)111-116
Number of pages6
JournalMaterials Science Forum
Volume350
Publication statusPublished - 2000 Jan 1
EventProceedings of the 1st Nagaoka International Workshop on Magnesium Platform Science and Technology 2000 - Nagaoka, Jpn
Duration: 2000 Jul 272000 Jul 29

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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