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 fractographs of Mg-9Gd-4Y-0.6Zr alloy specimens which were tensioned at differenttemperatures were investigated by optical and scanning electron microscopy, respectively. Theresults showed that different slip systems were activated at different temperatures, which wereresponsible for varied deformation mechanisms and fracture mechanisms. At 25 °C, the enabled slipsystems were few and only the slip systems on basal plane were able to be activated, so cleavagefracture was observed. At −196°C[removed info]the number of enabled slip systems increased, prismatic orpyramidal slip maybe occurred, so that an obvious low-temperature plasticity was observed, whilefracture mechanisms were mainly microvoid coalescence fracture with cleavage fracture in localareas. At 250 °C, 300 °C and 350 °C, the multisystem slips on the basal planes, the prismatic planesand the pyramidal planes were able to be activated, while fracture mechanisms were also microviodcoalescence fracture. At 400 °C, recrystallization happened, grain-boundary sliding in new finerecrystallized grains made the plastic deformation easy, showing coarse-grain superplasticityphenomenon, and an intergranular shear fracture took place
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.261.pdf
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