摘要
研究了ＤＤＳ镍基高温合金单晶制备中择优生长晶向偏离热流杂晶的长大机制．实验结果表明．在一定条件下择优生长晶向偏离热流方向的晶粒能够淘汰择优生长晶向平行于热流方向的晶粒研究表明，镍基高温合金单晶制备中的晶粒淘汰过程并不取决于择优生长晶向与热流方向平行。
The growth mechanism of misoriented grains whoes preferred crystal growth direction deviates from heat gradient direction in single crystal manufacture of DD8 nickel based superalloy has been investigated. Experimental results show that under a certain condition these grains can eliminate those parallel to the heat gradient. It is indicated that the elimination process of grains in the single crystal manufacture of nickel based superalloy does not depend on parallelism of the preferred crystal growth direction to the heat gradient direction, but the three dimensional relative position of dendrites in grain, which gives a good explanation to the phenomenon of the growth of misoriented grain without predetermined crystal direction, that frequently occurs in the single crystal manufacture of high temperature superalloy.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期1-6,共6页
Acta Metallurgica Sinica
关键词
镍基
高温合金
单晶
杂晶
晶粒长大
nickel based superalloy, single crystal, misoriented grain, grain growth
