Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7971934 | Materials Science and Engineering: A | 2018 | 21 Pages |
Abstract
A Mg-4.78Zn-0.45Y-0.10Zr (wt%) alloy with specifically oriented columnar grain structures (crystal growth direction ã101¯0ã) was prepared using directional solidification. The columnar grain structures possessed parallel-growing primary arms and straight longitudinal grain boundaries. The results from an electron backscatter diffraction analysis demonstrated that the angle between the c-axis and the growth direction was 74-87°. As the tensile tests were performed along the ã011¯0ã growth direction, the Schmid factors for the cylindrical and conical plane slips were as high as 0.45. When the tensile test temperature was 300â°C, dynamic recovery was observed and the cylindrical, conical, and conical slip systems were all activated. This phenomenon, together with the high orientation consistency between the adjoining grains, resulted in an elongation increase up to 42%. Fractography of the Mg alloy revealed extended or parabola-shaped dimples with specifically oriented columnar grain structures, suggesting good ductility for this material.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Sheng-shi Zhao, Xiao-ping Lin, Yun Dong, Yi Niu, Dan Xu, Heng Sun,