TY - JOUR
T1 - Forming mechánism of refined granular crystalline of Cu70Ni30 alloy by undercooled solidification
AU - Guo, Xuefeng
AU - Liu, Feng
AU - Yang, Gencang
AU - Xing, Jiandong
PY - 2000
Y1 - 2000
N2 - Both glass fluxing and cyclic superheating techniques were adopted to effectively undercool the Cu70Ni30 alloy in vacuum. Within the undercooling range of 21 K to 270 K, the microstructure evolution of the alloy was investigated. When the melt was undercooled to ΔT > ΔT″3 (210 K), the grain refinement took place abruptly. Based on the observation of the solidified microstructure, the microchemical-analysis and the calculated results with BCT model, it is found that the secondary grain refinement mechanism consists of two stages. 'The dendrite is, firstly, broken into fragments owing to the stress caused by uneven shrinking during rapid solidification, then the fragments, under the driving force of surface and strain energies, merge through the migration of boundaries, i. e. recrystallization, thus leading to the formation of secondary granular-crystalline.
AB - Both glass fluxing and cyclic superheating techniques were adopted to effectively undercool the Cu70Ni30 alloy in vacuum. Within the undercooling range of 21 K to 270 K, the microstructure evolution of the alloy was investigated. When the melt was undercooled to ΔT > ΔT″3 (210 K), the grain refinement took place abruptly. Based on the observation of the solidified microstructure, the microchemical-analysis and the calculated results with BCT model, it is found that the secondary grain refinement mechanism consists of two stages. 'The dendrite is, firstly, broken into fragments owing to the stress caused by uneven shrinking during rapid solidification, then the fragments, under the driving force of surface and strain energies, merge through the migration of boundaries, i. e. recrystallization, thus leading to the formation of secondary granular-crystalline.
KW - Cuni alloy
KW - Dendrite breaking
KW - Recrystallization
KW - Undercooling
UR - http://www.scopus.com/inward/record.url?scp=21244438008&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:21244438008
SN - 1002-0071
VL - 10
SP - 944
EP - 945
JO - Progress in Natural Science: Materials International
JF - Progress in Natural Science: Materials International
IS - 12
ER -