Effect of twinning on the mechanical behavior in Mg-Zn-Y alloys

Ju Youn Lee, Hyun Kyu Lim, Do Hyung Kim, Won Tae Kim, Do Hyang Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the present work, the effect of twinning on the mechanical behavior of Mg-Zn-Y alloys has been investigated by controlling the process condition and modifying the matrix. In order to study the effect of the deformation speed, we examined as-rolled Mg-6Zn-1.2Y by changing rolling speeds (32-64 mm/s). Dynamically recrystallized grain structure was developed under a lower rolling speed of 32 mm/s, while significantly twinned grain structure was obtained under a higher rolling speed of 64 mm/s. From the results of tensile test, uniform elongation increases from 5.3% to 7.3% with increasing rolling speeds. In order to study the effect of mechanical twinning on the mechanical behavior, we examined Mg-xZn-0.6Y alloys (x = 3-7). Mg-xZn-0.6Y alloys are consisted of α-Mg and icosahedral phase (I-phase) particles up to 7 wt% Zn. From the result of tensile test, the strength and elongation increase simultaneously with increasing zinc content in spit of similar grain size and similar volume fraction of I-phase particles. Detailed study by an interrupted tensile test shows that the volume fraction of twins in interrupted Mg-7Zn-0.6Y is higher than that in Mg-3Zn-0.6Y. Texture analysis shows that the type of twinning is (10-12) extension type twin. Therefore, it can be suggested that twinning leads to enhance strain hardening and reorient basal slip to more favorable orientations, improving the elongation in wrought Mg-Zn-Y alloys.

Original languageEnglish
Title of host publicationMagnesium Technology 2008
Pages253-255
Number of pages3
Publication statusPublished - 2008 Jun 30
EventMagnesium Technology 2008 - New Orleans, LA, United States
Duration: 2008 Mar 92008 Mar 13

Publication series

NameMagnesium Technology
ISSN (Print)1545-4150

Other

OtherMagnesium Technology 2008
CountryUnited States
CityNew Orleans, LA
Period08/3/908/3/13

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Lee, J. Y., Lim, H. K., Kim, D. H., Kim, W. T., & Kim, D. H. (2008). Effect of twinning on the mechanical behavior in Mg-Zn-Y alloys. In Magnesium Technology 2008 (pp. 253-255). (Magnesium Technology).