TY  - JOUR
PY  - 2007//
TI  - Microstructure and mechanical properties of directionalry solidified Nb-22Ti-16Si-7Cr-3Al-3Ta-2Hf-0.1 Ho alloy
JO  - Advanced Engineering Materials
A1  - Tian, Y.
A1  - Cheng, G.
A1  - Guo, J.
A1  - Zhou, L.
A1  - He, L.
A1  - Ye, H.
SP  - 963
EP  - 966
VL  - 9
IS  - 11
N2  - The microstructure of the DS alloy is composed of (Nb, Ti)ss matrix, (Nb, Ti)5Si3, (Ti, Nb)5Si3 and a small amount of Ho2Hf2O7. The microstructure of the DS sample is coarser than that of the CC sample due to the slower solidification rate of the former. The typical microstructure of the longitudinal section shows that the lamellar suicide phases are aligned parallel to the growth direction and embedded within a (Nb, Ti)ss matrix. The high-temperature compressive yield stress and room-temperature fracture toughness of the DS alloy are higher than those of the CC alloy. The fracture exhibits a mixed fracture mode in the DS alloy. However, the transgranular cleavage is the predominant fracture mode in the CC alloy. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA,.<p /> <p>Language: en</p>
LA  - en
SN  - 1527-2648
UR  - http://dx.doi.org/10.1002/adem.200700141
ID  - ref1
ER  -