Mechanism of dynamic recrystallization and evolution of texture in the hot working domains of the processing map for Mg-4Al-2Ba-2Ca Alloy
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In: Metals, Vol. 7, No. 12, 539, 02.12.2017.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Mechanism of dynamic recrystallization and evolution of texture in the hot working domains of the processing map for Mg-4Al-2Ba-2Ca Alloy
AU - Suresh, Kalidass
AU - Rao, Kamineni Pitcheswara
AU - Prasad, Yellapregada Venkata Rama Krishna
AU - Wu, Chi Man Lawrence
AU - Hort, Norbert
AU - Dieringa, Hajo
N1 - Acknowledgments: The research work has been supported by a Strategic Research Grant (No. 7002744) from the City University of Hong Kong. The authors would like to thank to Chi Hung Yuen, Chalasani Dharmendra, and Ho Ying Ip for their help in compression tests, EBSD analysis, and microstructure work, respectively.
PY - 2017/12/2
Y1 - 2017/12/2
N2 - The occurrence of dynamic recrystallization (DRX) and its effect on the evolution of texture during uniaxial compression of a creep-resistant cast Mg-4Al-2Ba-2Ca alloy in the temperature range of 260-500 °C and strain rate range of 0.0003-10 s-1 has been studied using transmission electron microscopy and electron backscatter diffraction techniques with a view to understand its mechanism. For this purpose, a processing map has been developed for this alloy, which revealed two domains of DRX in the temperature and strain rate ranges of: (1) 300-390 °C/0.0003-0.001 s-1 and (2) 400-500 °C/0.0003-0.5 s-1. In Domain 1, DRX occurs by basal slip and recovery by dislocation climb, as indicated by the presence of planar slip bands and high dislocation density leading to tilt boundary formation and a low-intensity basal texture. On the other hand, DRX in Domain 2 occurs by second order pyramidal slip and recovery by cross-slip since the microstructure revealed tangled dislocation structure with twist boundaries and randomized texture. The high volume content of intermetallic phases Mg21Al3Ba2 and (Al,Mg)2Ca eutectic phase is considered to be responsible for the observed hot deformation behavior.
AB - The occurrence of dynamic recrystallization (DRX) and its effect on the evolution of texture during uniaxial compression of a creep-resistant cast Mg-4Al-2Ba-2Ca alloy in the temperature range of 260-500 °C and strain rate range of 0.0003-10 s-1 has been studied using transmission electron microscopy and electron backscatter diffraction techniques with a view to understand its mechanism. For this purpose, a processing map has been developed for this alloy, which revealed two domains of DRX in the temperature and strain rate ranges of: (1) 300-390 °C/0.0003-0.001 s-1 and (2) 400-500 °C/0.0003-0.5 s-1. In Domain 1, DRX occurs by basal slip and recovery by dislocation climb, as indicated by the presence of planar slip bands and high dislocation density leading to tilt boundary formation and a low-intensity basal texture. On the other hand, DRX in Domain 2 occurs by second order pyramidal slip and recovery by cross-slip since the microstructure revealed tangled dislocation structure with twist boundaries and randomized texture. The high volume content of intermetallic phases Mg21Al3Ba2 and (Al,Mg)2Ca eutectic phase is considered to be responsible for the observed hot deformation behavior.
KW - Hot deformation
KW - Magnesium alloy
KW - Microstructure
KW - Processing map
KW - Recrystallization
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85037724139&partnerID=8YFLogxK
U2 - 10.3390/met7120539
DO - 10.3390/met7120539
M3 - Journal articles
AN - SCOPUS:85037724139
VL - 7
JO - Metals
JF - Metals
SN - 2075-4701
IS - 12
M1 - 539
ER -