Abstracts Book - IMRC 2018

• SE1-O009 Invited Talk
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF Ca
CONTAINING AZXW3100 ALLOY SHEETS
Sangbong Yi 1 , José Victoria Hernández 1 , Young Min Kim 2 , Bong Sun You 3 , Dietmar Letzig 1
1 Helmholtz Zentrum Geesthacht, Magnesium Innovation Centre, Germany. 2 Korea Institute of
Materials Science, Implementation research division, Korea. 3 Korea Intitute of Materials
Science, Implementation research division, Korea.
The influence of thermomechanical processing conditions on the
microstructure and texture evolution was investigated using a modified AZ31
alloy by Ca and Y addition, which shows an excellent non-flammability and
corrosion resistance. AZXW3100 alloy (Mg-3Al-1Zn-0.5Ca-0.5Y in wt.%) sheets
were produced by using different parameters of thermomechanical treatments,
i.e. diverse sets of the rolling temperatures and pass reduction degrees. The
experimental results show that the textures from the rolling and
recrystallization annealing are strongly influenced by the rolling schedules. For
example, texture types at the final gage are controlled to be a relatively strong
basal-type texture with a basal-pole split into rolling direction (RD), a weak basaltype
texture with far largely tilted basal-poles into RD or basal poles tilted in the
transverse direction (TD) by using different thermomechanical treatments. The
rolling condition influences also on the grain sizes of the recrystallized sheets,
varying within a range of 6 µm and 21 µm after recrystallization annealing of the
differently rolled sheets. The Erichsen index (IE) of the sheets varies in
accordance to the texture sharpness, i.e. the weaker texture the higher IE. The
sheet having the basal pole split into TD shows an excellent formability with IE
of 8.5, which is about 3-fold higher value than that obtained in a conventional
Mg alloy sheet.
Acknowledgment:
The authors appreciate Mr. A. Reichart and Ms. Y.K. Shin at HZG for technical
supports during the warm rolling and microstructure analysis. The financial
supports of NST - National Research Council of Science & Technology (No. CRC-
15-06-KIGAM) by the Korea government (MSIP) are gratefully acknowledged.
Keywords: Mg sheets, Microstructure, Texture
Presenting authors email: sangbong.yi@hzg.de