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Study on Rapidly Solidified Powder Magnesium Alloys

Research Project

Project/Area Number 01550539
Research Category

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

Allocation TypeSingle-year Grants
Research Field 金属加工(含鋳造)
Research InstitutionNihon University

Principal Investigator

KANEKO Junichi  Nihon Univ., College of Industrial Technology, Professor, 生産工学部, 教授 (00120410)

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)
KeywordsMagnesium Alloys / Rapid Solidification / Powder Metallurgy / Mechanical Properties / Age Hardening / Specific Strength / 比強度
Research Abstract

Rapidly solidified P/M materials were produced for AZ91 and ZK61 magnesium alloys with alloying additions of Si, Ni, Mn and Ce, and their mechanical properties were examined, with the prupose of improving properties of conventionally processed magnesium materials. Rapidly solidified flakes showed cellular dendritic structures of 1 to 2 mum in the average cell size. The cooling rate during solidification was estimated as 10^4 to 10^5 K/s. P/M materials of 7 mm in diameter were produced by cold pressing and hot extrusion.
Among obtained P/M materials of AZ91 based alloys, Si bearing alloy showed the highest peak hardness when aged at 433 K. Ni and Ce bearing alloys showed very little age hardening for both AZ91 and ZK61 based alloys. Mn bearing ZK61 alloy showed higher age hardening at 403 K than the base alloy. Rapid solidification of magnesium alloys with some proper alloying additions was shown to be very effective in increasing strength of magnesium alloys. Among the all tested materials, P/M materials of Ce added ZK61 alloy showed the highest tensile strength of 554 MPa. The specific strength of this alloy was as high as 295 MPa and exceeded those of 7075 aluminum alloy and Ti-6Al-4V. At elevated temperatures, rapidly solidified P/M materials showed lower tensile strength and higher elongation than I/M magnesium materials. P/M materials of AZ91 alloy showed elongation higher than 400% at 573 K, which is in the superplastic deformation regime. Thus, the salient features of rapidly solidified magnesium P/M materials are higher strength at room tempearture and higher ductility at elevated temperatures than the conventionally processed magnesium materials.

Report

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

URL: 

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

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