杨万鹏,李嘉荣,刘世忠,史振学,赵金乾,王效光.一种镍基第三代单晶高温合金的横向拉伸性能[J].稀有金属材料与工程,2018,47(10):2964~2969.[Yang Wanpeng,Li Jiarong,Liu Shizhong,Shi Zhenxue,Zhao Jinqian,Wang Xiaoguang.Transverse Tensile Properties of a Nickel-based Third Generation Single Crystal Superalloy[J].Rare Metal Materials and Engineering,2018,47(10):2964~2969.]
一种镍基第三代单晶高温合金的横向拉伸性能
投稿时间:2017-03-07  修订日期:2017-04-11
中文关键词:  第三代单晶高温合金  横向拉伸性能  断口  位错
基金项目:
中文摘要:
      在760℃到1100℃条件下,研究了一种镍基第三代单晶高温合金的横向拉伸性能。采用光学显微镜(OM)、场发射扫描电子显微镜(FESEM)与扫描透射电子显微镜(STEM)观察了合金的显微组织与断口形貌。结果表明:随着温度的升高,合金的拉伸强度降低,而拉伸延伸率增加。在760℃与850℃条件下的拉伸断裂均为类解理断裂。在980℃,1070℃和1100℃条件下,试样断口出现了反映凝固方向的枝晶形貌特征,且随着温度的升高枝晶形貌在断口上的面积增加。在980℃条件下,拉伸断裂为类解理断裂与韧窝断裂的混合断裂。在1070℃与1100℃条件下,拉伸断裂均为韧窝断裂。随着温度的升高,塑性变形过程中开动了更多滑移系,导致形成了不同的位错形貌。760℃拉伸,合金中出现了高密度大致平行分布的a/2<110>位错;980℃拉伸,合金中出现了位错缠结;1100℃拉伸,合金中形成了位错网络。
Transverse Tensile Properties of a Nickel-based Third Generation Single Crystal Superalloy
英文关键词:third generation single crystal superalloy  transverse tensile properties  fracture surface  dislocation
英文摘要:
      At the temperature range of 760 °C to 1100 °C, the transverse tensile properties of a nickel-based third generation single crystal superalloy were studied. The microstructures and fracture surfaces were observed by optical microscopy (OM), field emission scanning electron microscopy (FESEM) and scanning transmission electron microscopy (STEM). The results show that the tensile strength of the alloy decreases as the temperature increases, while the tensile elongation of the alloy increases with the temperature increasing. The fracture surfaces of the tensile ruptured specimens are characterized by quasi-cleavage features at 760 °C and 850 °C. At the temperature range of 980 °C to 1100 °C, dendrites characteristics exhibiting the solidification direction are observed on the fracture surfaces and the proportion of dendrites characteristic on the fracture surfaces increases with the temperature increasing. The fracture surface displays mixed quasi-cleavage and dimple features at 980 °C. The fracture surfaces are characterized by dimple features at 1070 °C and 1100 °C. As the temperature increases, more slip systems tend to be activated during the plastic deformation, result in different dislocation configurations. At 760 °C, high density a/2<110> dislocations are found to distribute roughly parallel with each other in the tensile ruptured specimens. The dislocations are observed to be tangled at 980 °C and dislocation networks have formed at 1100 °C.
作者单位E-mail
杨万鹏 北京航空材料研究院 先进高温结构材料重点实验室 wp_yang621@126.com 
李嘉荣 北京航空材料研究院 先进高温结构材料重点实验室  
刘世忠 北京航空材料研究院 先进高温结构材料重点实验室  
史振学 北京航空材料研究院 先进高温结构材料重点实验室  
赵金乾 北京航空材料研究院 先进高温结构材料重点实验室  
王效光 北京航空材料研究院 先进高温结构材料重点实验室  
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