TY - JOUR
T1 - The Effects of a Trace Amount of Manganese and the Homogenization on the Recrystallization of Al–7Mg–0.15Ti Alloys
AU - Chiu, Yang Chun
AU - Pan, Tse An
AU - Chen, Guan Ming
AU - Jiang, Xin Cheng
AU - Bor, Hui Yun
AU - Tzeng, Yu Chih
AU - Lee, Sheng Long
N1 - Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - The aim of this study is to explore the effects of Manganese addition and homogenization treatment on the microstructures and mechanical properties of the Al–7Mg–0.15Ti (B535.0) alloy. The optical microscopy, electrical conductivity measurements, transmission electron microscopy, scanning electron microscopy (SEM + EBSD), as well as Rockwell hardness and tensile tests, were exploited for this purpose. The main objectives are to refine the grain size, inhibit grain growth in the annealed state, and enhance the mechanical strength of the alloy. The results show that the addition of manganese to the Al–7Mg–0.15Ti alloys refined the as-cast and recrystallized grains of the alloys. During the homogenization process, Al4 Mn high-temperature stable dispersoids were precipitated in the aluminum matrix. After annealing, the Al4 Mn particles blocked the movement of grain boundaries during the growth of the recrystallized grains and inhibited grain growth. Consequently, the annealed alloys showed grain refinement and dispersion strengthening. The Al4 Mn dispersoids of the alloys with manganese added were smaller and denser after a two-stage homogenization process compared to those that underwent a one-stage homogenization process. By contrast, for the alloys without the addition of manganese, the recrystallized grains showed normal growth after annealing, and different homogenization processes had no significantly different effects.
AB - The aim of this study is to explore the effects of Manganese addition and homogenization treatment on the microstructures and mechanical properties of the Al–7Mg–0.15Ti (B535.0) alloy. The optical microscopy, electrical conductivity measurements, transmission electron microscopy, scanning electron microscopy (SEM + EBSD), as well as Rockwell hardness and tensile tests, were exploited for this purpose. The main objectives are to refine the grain size, inhibit grain growth in the annealed state, and enhance the mechanical strength of the alloy. The results show that the addition of manganese to the Al–7Mg–0.15Ti alloys refined the as-cast and recrystallized grains of the alloys. During the homogenization process, Al4 Mn high-temperature stable dispersoids were precipitated in the aluminum matrix. After annealing, the Al4 Mn particles blocked the movement of grain boundaries during the growth of the recrystallized grains and inhibited grain growth. Consequently, the annealed alloys showed grain refinement and dispersion strengthening. The Al4 Mn dispersoids of the alloys with manganese added were smaller and denser after a two-stage homogenization process compared to those that underwent a one-stage homogenization process. By contrast, for the alloys without the addition of manganese, the recrystallized grains showed normal growth after annealing, and different homogenization processes had no significantly different effects.
KW - Al Mn dispersoids
KW - Al–Mg alloy
KW - manganese
KW - mechanical properties
KW - recrystallized grains
KW - two-stage homogenization
UR - http://www.scopus.com/inward/record.url?scp=85099331737&partnerID=8YFLogxK
U2 - 10.3390/MOLECULES26010168
DO - 10.3390/MOLECULES26010168
M3 - 期刊論文
C2 - 33396531
AN - SCOPUS:85099331737
SN - 1420-3049
VL - 26
JO - Molecules
JF - Molecules
IS - 1
M1 - 168
ER -