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
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)
magnesium-zinc-yttrium, rapid solidification, powder metallurgy, nanocrystalline, superplasticity
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© 2002 The Japan Institute of Metals
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