Authors: Huan Wang Carl J Boehlert Qudong Wang Dongdi Yin Wenjiang Ding
Publish Date: 2016/03/08
Volume: 47, Issue: 5, Pages: 2421-2443
Abstract
The tension and tensioncreep deformation behavior at elevated temperatures of a cast Mg10Gd3Y05Zr wt pct GW103 alloy was investigated using in situ scanning electron microscopy The tests were performed at temperatures ranging from 473 K to 598 K 200 °C to 325 °C The active slip systems were identified using an EBSDbased slip trace analysis methodology The results showed that for all of the tests basal slip was the most likely system to be activated and nonbasal slip was activated to some extent depending on the temperature No twinning was observed For the tension tests nonbasal slip consisted of ~35 pct of the deformation modes at low temperatures 473 K and 523 K 200 °C and 250 °C while nonbasal slip accounted for 12 and 7 pct of the deformation modes at high temperatures 573 K and 598 K 300 °C and 325 °C respectively For the tensioncreep tests nonbasal slip accounted for 31 pct of the total slip systems at low temperatures while this value decreased to 10 to 16 pct at high temperatures For a given temperature the relative activity for prismatic slip in the tensioncreep tests was slightly greater than that for the tension tests while the activity for pyramidal slip was lower Sliptransfer in neighboring grains was observed for the lowtemperature tests Intergranular cracking was the main cracking mode while some intragranular cracks were observed for the tensioncreep tests at high temperature and low stress Grain boundary ledges were prevalently observed for both the tension and tensioncreep tests at high temperatures which suggests that besides dislocation slip grain boundary sliding also contributed to the deformationThis work was supported by the National Natural Science Foundation of China No 51074106 and No 51401172 Key HiTech Research and Development Program of China 2009AA033501 National Key Technology RD Program of China 2011BAE22B015 and China Scholarship Council No 201306230034 The authors are grateful to Professor TR Bieler and graduate students A Chakkedath A Amroussia U Okeke and V Khademi of Michigan State University for their intellectual discussions and assistance with sample preparation
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