(1. 中國科學院金屬研究所材料疲勞與斷裂國家重點實驗室，沈陽 110015；
2. 沈陽工業(yè)大學 材料科學與工程系，沈陽110023；
3. 東北大學材料與冶金學院，沈陽 110006)
摘 要: 通過對［001］取向單晶鎳基合金蠕變曲線和位錯運動內摩擦力的測定及能譜微區(qū)成分分析，研究了兩種合金的蠕變特性。結果表明：在1000 ℃和120MPa條件下，兩合金位錯運動的內摩擦力值相近，隨溫度的升高，兩合金的內摩擦力差值增大；隨著溫度的提高，不含Ta的合金中γ' 相尺寸和體積分數(shù)明顯減少，而Al和Ta元素含量較高的合金中，γ' 相保持較高的體積分數(shù)是合金蠕變抗力明顯提高的主要原因。
關鍵字: 單晶鎳基合金；合金元素；蠕變抗力；位錯攀移
（1. State Key Laboratory for Fatigue and Fracture of Materials,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110015, P.R.China;
2. Department of Materials Science and Engineering, Shenyang Polytechnic University, Shenyang 110023, P.R.China;
3. School of Materials and Metallurgy, Northeastern University, Shenyang 110006, P.R.China）
Abstract:The affection factors of the creep behaviour for two single crystal nickel-base superalloys with [001] orientation were studied by measuring the creep curves and internal stress of dislocation motion, and by EDAX composition analysis as well. It is shown that the size and volume fraction of the γ' phase in alloy containing no element Ta are obviously decreased with the increasing of temperature. The main reason for the better creep resistance of the alloy, containing more elements Ta and Al, during steady creep is that it keeps a high volume fraction of γ' phase.
Key words: single crystal nickel-base superalloys; alloying elements; creep resistance; dislocation climb
