Materials Transactions Online

Materials Transactions, Vol.42 No.7 (2001) pp.1172-1176
Special Issue on Platform Science and Technology for Advanced Magnesium Alloys
© 2001 The Japan Institute of Metals

Rapidly Solidified Powder Metallurgy Mg97Zn1Y2Alloys with Excellent Tensile Yield Strength above 600 MPa

Yoshihito Kawamura1, Kentaro Hayashi2, Akihisa Inoue3 and Tsuyoshi Masumoto4

1Dept. Mechanical Engineering and Materials Science, Kumamoto University, Kumamoto 860-8555, Japan
2Graduate Student, Tohoku University, Sendai 980-8577, Japan
3Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
4Research Institute for Electric and Magnetic Materials, Sendai 826-0008, Japan

Nanocrystalline magnesium alloys having high tensile strength, high elevated-temperature tensile strength, high-strain-rate superplasticity and high thermal stability have been developed in Mg97Zn1Y2 (at%) alloy by rapidly solidified powder metallurgy (RS P/M) processing. The tensile yield strength and elongation that were dependent on the consolidation temperature were in the ranges of 480 to 610 MPa and 5 to 16%, respectively. Young's modulus of the RS P/M alloy was 45 GPa. The specific tensile yield strength was four times as high as that of a commercial AZ91-T6 alloy, and was higher than those of conventional titanium (Ti-6Al-4V) and aluminum (7075-T6) alloys. The RS P/M alloys exhibited excellent elevated-temperature yield strength that was 510 MPa at 423 K. The RS P/M alloy also exhibited high-strain-rate superplasticity at a wide strain-rate range from 1 × 10-2 to 1 × 100 s-1 and at a low temperature of 623 K. It is expected that the Mg97Zn1Y2 RS P/M alloy can be applied in some fields that requires simultaneously the high specific strength at ambient and elevated temperatures and high workability.

(Received February 22, 2001; Accepted April 16, 2001)

Keywords: magnesium-zinc-yttrium, rapid solidification, powder metallurgy, nanocrystalline, superplasticity

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