TY - GEN
T1 - Effect of the al addition on the structure of directionally solidified Ni-W eutectic composites
AU - Yoshida, M.
AU - Tujimura, T.
AU - Nakae, H.
PY - 1993/12/1
Y1 - 1993/12/1
N2 - The effect of al addition on the growth morphology of α-W phase in Ni-W eutectic alloy was investigated. The trajectory of the eutectic liquids trough was also estimated by thermal analysis and microstructure observation to determine the optimal quantity of al for directional solidification. The trajectory is expressed as follows: Ni-(21-X)at%W-Xat%Al, X≤5. Based upon these results, the directional solidification was carried out at the composition of Ni-16at%W-5at%Al. The composite structure was obtained under the condition of G/R/>40 (K*hr/cm2). The rods to lamellae transition shifted at a lower rate than that of the binary Ni-W eutectic. Also many growth defects were observed in the α phase. These defects may be caused by the existence of a freezing range, since the α primaries grow non-faceted, though the eutectic α phases grow faceted.
AB - The effect of al addition on the growth morphology of α-W phase in Ni-W eutectic alloy was investigated. The trajectory of the eutectic liquids trough was also estimated by thermal analysis and microstructure observation to determine the optimal quantity of al for directional solidification. The trajectory is expressed as follows: Ni-(21-X)at%W-Xat%Al, X≤5. Based upon these results, the directional solidification was carried out at the composition of Ni-16at%W-5at%Al. The composite structure was obtained under the condition of G/R/>40 (K*hr/cm2). The rods to lamellae transition shifted at a lower rate than that of the binary Ni-W eutectic. Also many growth defects were observed in the α phase. These defects may be caused by the existence of a freezing range, since the α primaries grow non-faceted, though the eutectic α phases grow faceted.
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M3 - Conference contribution
AN - SCOPUS:0027842726
SN - 0873392566
T3 - First International Conference on Processing Materials for Properties
SP - 67
EP - 70
BT - First International Conference on Processing Materials for Properties
PB - Publ by Minerals, Metals & Materials Soc (TMS)
T2 - Proceedings of the 1st International Conference on Processing Materials for Properties
Y2 - 7 November 1993 through 10 November 1993
ER -