ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A conventional extrusion has been carried out to induce significant grain refinement inMg-Zn-Y-Zr alloy. The results showed that good superplasticity have obtained in this extruded alloy.The simple and rapid processing route may allow it to be put into successfully practical use inindustry. The effects of temperature and strain rate on superplastic deformation of the extruded alloywere studied. The optimum condition with the elongation of more than 450% was found to be at450°C and 3.3×10-4s-1. Jump tests were carried out at 300-450°C and 8.3×10-5 ~ 1.7×10-2s-1. Theactivation energy for superplastic deformation at 300-450°C is 106kJ/mol and the stress exponent isabout 2.8. The superplasticity observed in this studied condition may be attributed to mechanisms ofdislocation creep mainly within large grains and grain boundary sliding (GBS) of small grains
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.337.pdf
