Journal of Alloys and Compounds 2018-04-03

New orientations between β′2 phase and α matrix in a Mg-Zn-Mn alloy processed by high strain rate rolling

Jimiao Jiang, Song Ni, Hongge Yan, Qin Wu, Min Song

Index: 10.1016/j.jallcom.2018.04.005

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Abstract

Strengthening precipitates in a Mg-Zn-Mn alloy, processed by high strain rate rolling, have been characterized by transmission electron microscopy. Precipitations involve a few (0001)α plates and spherical precipitates. All the precipitates have an hexagonal structure of MgZn2 and can be defined as β′2 phase. The (0001)α plates and a portion of the spherical precipitates have a common orientation relationship of View the MathML source[2¯110]β2'//[011¯0]α, View the MathML source(0001)β2'//(0001)α and View the MathML source(011¯0)β2'//(2¯110)α to α-Mg matrix. New orientation relationships (for example, View the MathML source[2¯110]β2'//[011¯0]α and View the MathML source(011¯5)β2'∼//(2¯110)α) between the spherical precipitates and α-Mg matrix were firstly observed, and the formation mechanism was systematically discussed.

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