TY - JOUR
T1 - Effect of casting temperature on microstructure in a directionally solidified Ni-44Ti-5Al-2Nb-1Mo alloy
AU - Pan, Qing
AU - Zheng, Lijing
AU - Sang, Yurong
AU - Li, Yan
AU - Zhou, Lei
AU - Zhang, Hu
PY - 2011/3
Y1 - 2011/3
N2 - Ni-44Ti-5Al-2Nb-1Mo (atomic fraction, %) alloy was directional solidified (DS) at different temperature (1350, 1450, 1550, 1650 °C) and a constant withdrawing rate of 100 μm/s, by liquid metal cooling method. The microstructural characteristics indicate that the DS temperature do not influence the phase composition, but rather to change the phase morphology. The phase composition of directional solidified samples is the same as the as-cast sample, which is composed of NiTi (B2), Ti 2Ni and Nb-rich phases. After DS, [100] becomes the preferred orientation in NiTi matrix. With the casting temperature increasing, [100] orientation is significantly enhanced, the solid/liquid (S/L) interface morphology changes from cellular dendrite to cellular, and the interface shape changes from convex to plane. Meantime, the volume fraction of the Nb-rich phase decreases with the temperature increasing.
AB - Ni-44Ti-5Al-2Nb-1Mo (atomic fraction, %) alloy was directional solidified (DS) at different temperature (1350, 1450, 1550, 1650 °C) and a constant withdrawing rate of 100 μm/s, by liquid metal cooling method. The microstructural characteristics indicate that the DS temperature do not influence the phase composition, but rather to change the phase morphology. The phase composition of directional solidified samples is the same as the as-cast sample, which is composed of NiTi (B2), Ti 2Ni and Nb-rich phases. After DS, [100] becomes the preferred orientation in NiTi matrix. With the casting temperature increasing, [100] orientation is significantly enhanced, the solid/liquid (S/L) interface morphology changes from cellular dendrite to cellular, and the interface shape changes from convex to plane. Meantime, the volume fraction of the Nb-rich phase decreases with the temperature increasing.
KW - Casting temperature
KW - Directional solidification
KW - Intermetallic
KW - Microstructure
KW - NiTiAl alloy
UR - https://www.scopus.com/pages/publications/84862908388
U2 - 10.1007/s12598-011-0301-x
DO - 10.1007/s12598-011-0301-x
M3 - 文章
AN - SCOPUS:84862908388
SN - 1001-0521
VL - 30
SP - 349
EP - 353
JO - Rare Metals
JF - Rare Metals
IS - SUPPL.1
ER -