Aluminium segregation of TiAl during single crystal growth

被引：5
作者：
Bi, YJ
Abell, JS
机构：
[1] School of Metallurgy and Materials, University of Birmingham
来源：
SCRIPTA MATERIALIA | 1997年 / 37卷 / 06期
关键词：
D O I：
10.1016/S1359-6462(97)00177-2
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
γ-TiAl single crystals have been successfully prepared by an induction-heated cold crucible Czochralski technique which offers more flexibility than vertical float zoning. Compositional analysis of the Czochralski grown single crystals indicates a homogeneous composition after initial transition; and the average composition is close to the peritectic composition. However, γ-TiAl single crystals prepared by vertical float zoning show a small aluminium segregation profile along the growth direction; and the average composition of the as-grown crystals is close to that of the starting alloy. Compositional analysis further demonstrated the banded structure with alternative single γ-phase and α2 + γ lamellar regions in the vertical float zoned Ti-54 at.% Al.
引用
收藏
页码：743 / 752
页数：10
相关论文
共 36 条
[1]   DIRECTIONAL SOLIDIFICATION OF TIAL ALLOYS BY VERTICAL FLOAT ZONING [J].
BI, YJ ;
ABELL, JS .
SCRIPTA METALLURGICA ET MATERIALIA, 1994, 31 (06) :751-756
[2]   DEFECTS IN TERFENOL-D CRYSTALS [J].
BI, YJ ;
ABELL, JS ;
HWANG, AMH .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1991, 99 (1-3) :159-166
[3]   STRUCTURE OF DIRECTIONALLY SOLIDIFIED 2-PHASE SN-CD PERITECTIC ALLOYS [J].
BOETTINGER, WJ .
METALLURGICAL TRANSACTIONS, 1974, 5 (09) :2023-2031
[4]   TIAL SINGLE-CRYSTALS OBTAINED BY THE FLOATING ZONE TECHNIQUE [J].
FATHALLA, N ;
BAHI, S ;
KAWABATA, T ;
IZUMI, O .
MATERIALS SCIENCE AND ENGINEERING, 1983, 61 (03) :227-230
[5]   DEFORMATION OF POLYSYNTHETICALLY TWINNED CRYSTALS OF TIAL WITH A NEARLY STOICHIOMETRIC COMPOSITION [J].
FUJIWARA, T ;
NAKAMURA, A ;
HOSOMI, M ;
NISHITANI, SR ;
SHIRAI, Y ;
YAMAGUCHI, M .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1990, 61 (04) :591-606
[6]  
HUANG BY, 1989, MATER RES SOC SYMP P, V133, P231
[7]  
HUANG SC, 1989, HIGH TEMPERATURE ORD, V3, P373
[8]   NATURE AND DISSOCIATION OF THE DISLOCATIONS IN TIAL DEFORMED AT ROOM-TEMPERATURE [J].
HUG, G ;
LOISEAU, A ;
LASALMONIE, A .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1986, 54 (01) :47-65
[9]   WEAK-BEAM OBSERVATION OF A DISSOCIATION TRANSITION IN TIAL [J].
HUG, G ;
LOISEAU, A ;
VEYSSIERE, P .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1988, 57 (03) :499-523
[10]  
HURLE DTJ, 1994, HDB CRYSTAL GROWTH, P101
1234