High temperature deformation and microstructural features of TXA321 magnesium alloy: Correlations with processing map
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In: Advanced Engineering Materials, Vol. 15, No. 8, 08.2013, p. 761-766.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - High temperature deformation and microstructural features of TXA321 magnesium alloy
T2 - Correlations with processing map
AU - Dharmendra, Chalasani
AU - Rao, Kamineni Pitcheswara
AU - Prasad, Yellapregada Venkata Rama Krishna
AU - Hort, Norbert
AU - Kainer, Karl Ulrich
PY - 2013/8
Y1 - 2013/8
N2 - The hot deformation of cast TXA321 alloy has been studied in the temperature range 300-500 °C and in the strain rate range 0.0003-10 s -1 by developing a processing map. The map exhibited four domains in the temperature and strain rate ranges: (1) 300-325 °C and 0.0003-0.001 s-1, (2) 325-430 °C and 0.001-0.04 s-1, (3) 430-500 °C and 0.01-0.5 s-1, and (4) 430-500 °C and 0.0003-0.002 s-1. The first three domains represent dynamic recrystallization, resulting in finer grain sizes in the first two domains and coarser in the third domain. In the fourth domain, the alloy exhibited grain boundary sliding resulting in intercrystalline cracking in tension and is not useful for its hot working. Two regimes of flow instability were identified at higher strain rates, one at temperatures <380 °C and the other at >480 °C. The hot workability of Mg-3Sn-2Ca-1Al alloy has been established through the development of its processing map based on dynamic materials model. Domains 1-3 are considered as desirable processing windows for forming this alloy due to extensive dynamic recrystallization and grain refinement. Domain 4 represents extensive grain boundary sliding, and should be avoided under stresses of tensile nature due to flow instability.
AB - The hot deformation of cast TXA321 alloy has been studied in the temperature range 300-500 °C and in the strain rate range 0.0003-10 s -1 by developing a processing map. The map exhibited four domains in the temperature and strain rate ranges: (1) 300-325 °C and 0.0003-0.001 s-1, (2) 325-430 °C and 0.001-0.04 s-1, (3) 430-500 °C and 0.01-0.5 s-1, and (4) 430-500 °C and 0.0003-0.002 s-1. The first three domains represent dynamic recrystallization, resulting in finer grain sizes in the first two domains and coarser in the third domain. In the fourth domain, the alloy exhibited grain boundary sliding resulting in intercrystalline cracking in tension and is not useful for its hot working. Two regimes of flow instability were identified at higher strain rates, one at temperatures <380 °C and the other at >480 °C. The hot workability of Mg-3Sn-2Ca-1Al alloy has been established through the development of its processing map based on dynamic materials model. Domains 1-3 are considered as desirable processing windows for forming this alloy due to extensive dynamic recrystallization and grain refinement. Domain 4 represents extensive grain boundary sliding, and should be avoided under stresses of tensile nature due to flow instability.
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84881120532&partnerID=8YFLogxK
U2 - 10.1002/adem.201200379
DO - 10.1002/adem.201200379
M3 - Journal articles
AN - SCOPUS:84881120532
VL - 15
SP - 761
EP - 766
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
SN - 1438-1656
IS - 8
ER -