(1. 长安大学 材料科学与工程学院，西安 710064；
2. 西安赛特思迈钛业有限公司，西安 710018；
3. 西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 本文总结了镍基单晶高温合金中γ/γ′元素的分配行为，单晶高温合金中Re、Cr、Co、Mo、Ru和W元素主要分布于γ相中，Al、Ta和Ti元素主要分布于γ′相中。同时，单晶高温合金中γ/γ′元素分配行为受到合金元素交互作用的影响，如Re、Cr和Mo元素的分配比随单晶高温合金中Re+Cr+Mo含量以及Ta+Ti含量的提高而增大，W元素的分配比随着单晶高温合金中Ta+Ti含量的提高而增大；Ru的添加使部分合金中出现了元素“逆分配”的现象，但Ru元素产生“逆分配”作用并非普遍现象；Ta元素的分配比随单晶高温合金中Ta-Al质量比的提高而显著降低。
关键字: 镍基单晶高温合金；合金元素；γ/γ′元素分配行为；交互作用
（1. School of Materials Science and Engineering, Chang''an University, Xi''an 710064, China;
2. Xi''an Saite Simai Titanium Industry Co., Ltd., Xi''an 710018, China;
3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China）
Abstract:This paper summarized γ/γ′ partitioning behaviors of alloying elements in Nickel-based single crystal superalloys. The existing research results indicated that Re, Cr, Co, Mo, Ru and W elements mainly distributed in γ phase, while Al, Ta and Ti elements mainly distributed in γ′ phase. Meanwhile, γ/γ′ partitioning behaviors of alloying elements was found to be affected by the interaction of alloying elements. For example, the partitioning ratios of Re, Cr and Mo elements increased with increasing the Re+Cr+Mo content and Ta+Ti content in single crystal superalloy, and the partition ratio of W element increased with increasing the Ta+Ti content in single crystal superalloy. Meanwhile, Ru addition resulted in "reverse distribution" of alloying elements in some alloys, but “reverse distribution” caused by Ru element was not a common phenomenon. Moreover, the partitioning ratio of Ta element significantly decreased with increasing the Ta-Al mass ratio in single crystal superalloy.
Key words: nickel-based single crystal superalloy; alloying element; γ/γ′ element partitioning behavior; interaction
