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:
The dynamic stress-strain behavior of the AZ91 alloys in different treatment conditions(as-cast, T4 and T6) was investigated by means of split Hopkinson pressure bar. It was found that theflow stress increased at first, and then declined with the strain rate increasing at the range of102~103s-1 for the alloys in these three conditions. And the alloys exhibited both positive and negativestrain rate effects. The former was caused by strain rate strengthening and the latter was caused bystrain rate weakening. However the flow stress for the alloy in aged condition at the same strain ratewas higher than both of the alloys in as-cast and solution conditions. The study also showed that themaximum strains of the alloys in different conditions increased with the strain rate increasing, and thestrain rate to fracture for the alloy in solution condition was higher than those of other two alloys. Thework-hardening of α–Mg matrix and the reinforcement of β-Mg17Al12 phases led to the strengtheningof the alloy, while thermal softening of matrix, the fracture of β phases and initiation and propagationof the cracks were responsible for the weakening of the alloy
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.89.pdf
