一种低Re第二代镍基单晶高温合金的拉伸性能  

Tensile properties of a second-generation nickel base single crystal superalloy with low Re

作　　者：丁方政 陈昊 许剑伟[2] 杨功 谭俊龙 纪建敏 周章瑞 DING Fang-zheng;CHEN Hao;XU Jian-wei;YANG Gong;TAN Jun-long;JI Jian-min;ZHOU Zhang-rui(Sixth Military Representative Office of Air Force Equipment Department in Beijing,Beijing 100041,China;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Material Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]空装驻北京地区第六军事代表室,北京100041 [2]北京航空材料研究院先进高温结构材料重点实验室,北京100095 [3]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《材料热处理学报》2022年第9期87-93,共7页Transactions of Materials and Heat Treatment

摘　　要：利用扫描电镜和透射电镜及拉伸试验机等研究了一种自行设计的低Re第二代镍基单晶高温合金在不同温度下的拉伸变形行为及微观机制。结果表明:合金的屈服强度和抗拉强度随试验温度的升高先增加后降低,并表现出明显的反常屈服现象,760℃时合金的屈服强度达到峰值1099 MPa;断口分析表明在室温和760℃下合金的断裂模式为纯剪切断裂,而在980℃下转变为微孔聚集型断裂;合金在室温下的主要变形机制为单根超位错和小宽度层错剪切γ′相,在760℃下的变形机制为大宽度层错剪切γ′相,而在980℃下变形机制转变为带有反相畴界(APB)的超位错对剪切γ′相。The tensile deformation behavior and micro-mechanism of a self-designed second-generation nickel base single crystal superalloy with low Re at different temperatures were studied by scanning electron microscopy,transmission electron microscopy and tensile testing machine.The results show that the yield strength and tensile strength of the alloy first increase and then decrease with the increase of test temperature,and show obvious abnormal yield phenomenon.The yield strength of the alloy reaches the peak value of 1099 MPa at 760℃.The fracture surface analysis shows that the fracture mode of the alloy is pure shear fracture at room temperature and 760℃,while it changes to microporous aggregation fracture at 980℃.The main deformation mechanisms of the alloy at room temperature are single super dislocation and small width stacking fault shearγ′phase,the deformation mechanism at 760℃is large width stacking fault shearγ′phase,and at 980℃,the deformation mechanism changes to super dislocation pair with anti-phase boundary(APB)shearγ′phase.

关 键 词：镍基单晶高温合金 拉伸性能 断口形貌 位错组态 拉伸变形机制 

分 类 号：TG132.[一般工业技术—材料科学与工程]