Rapidly solidified powder metallurgy Mg(97)Zn(1)Y(2)Alloys with excellent tensile yield strength above 600 MPa

Citation
Y. Kawamura et al., Rapidly solidified powder metallurgy Mg(97)Zn(1)Y(2)Alloys with excellent tensile yield strength above 600 MPa, MATER TRANS, 42(7), 2001, pp. 1172-1176
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
MATERIALS TRANSACTIONS
ISSN journal
1345-9678 → ACNP
Volume
42
Issue
7
Year of publication
2001
Pages
1172 - 1176
Database
ISI
SICI code
1345-9678(200107)42:7<1172:RSPMMW>2.0.ZU;2-Y
Abstract
Nanocrystalline magnesium alloys having high tensile strength, high elevate d-temperature tensile strength, high-strain-rate superplasticity and high t hermal stability have been developed in Mg97Zn1Y2 (at%) alloy by rapidly so lidified 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 610MPa and 5 to 16%., respectively. Young's modulus o f 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. T he RS P/M alloys exhibited excellent elevated-temperature yield strength th at was 510 MPa at 423 K. The RS P/M alloy also exhibited high-strain-rate s uperplasticity at a wide strain-rate range from 1 x 10(-2) to 1 x 10(0) 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 hi gh specific strength at ambient and elevated temperatures and high workabil ity.