材料科学技术学报（英文版）
材料科學技術學報（英文版）
재료과학기술학보（영문판）
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
2008年
1期
127-130
,共4页
DD-8%Single crystal alloy%Microstructural stability%Alpha chromium
Microstructural stability of a nickel base single crystal alloy DD8 has been investigated. Standard heat treated specimen showed good microstructural stability at 950℃. While under the as-cast condition, a kind of rod-like phase precipitated in the interdendritic region of as-cast specimen during thermal exposure. The phase, which has bcc structure, was enriched with Cr. Thermo-calc also predicted precipitation of a bcc phase at around 950℃. The Cr-rich bcc phase was considered as α-Cr and formed due to the segregation of Cr under the as-cast condition.
