%0 Journal Article %T 一种新型镍基单晶高温合金拉伸性能研究 %T Tensile properties of a new nickel-based single crystal superalloy %A 姜华 %A 郭媛媛 %A 卢宇 %A 陈昊 %A JIANG,Hua %A GUO,Yuanyuan %A LU,Yu %A CHEN,Hao %J 重庆大学学报 %J Journal of Chongqing University %@ 1000-582X %V 42 %N 8 %D 2019 %P 74-78 %K 镍基单晶高温合金;拉伸性能;断裂模式 %K nickel-based single crystal superalloy;tensile property;deformation mechanism %X 研究了一种新型镍基单晶高温合金拉伸性能及断裂模式。采用[001]取向制备拉伸性能试样,以平行于单晶[001]取向作为应力轴方向,采用扫描电镜观察断口形貌。实验结果表明,随着拉伸温度升高,合金的抗拉和屈服强度逐渐升高,并分别在760℃和850℃达到峰值,之后随着温度升高迅速下降。塑性随温度的变化则相反,在760℃塑性指标达到最低值,随后断面收缩率急剧增加,而延伸率在850℃达到峰值后迅速下降。合金的拉伸断裂模式在980℃从准解理断裂转向塑韧性断裂。 %X The tensile properties and fracture modes of a new nickel-based single crystal superalloy were investigated. Tensile specimens were prepared from the single-crystal with[001] orientation, whose growth direction was parallel to the loading axis in tension. The fractograph was examined by means of scanning electron microscope. The results show that the tensile and yield strength increased first and then decreased with the test temperature increasing, and they reached the peak values at 760℃ and 850℃ respectively, while the elongation and the area reduction decreased gradually from room temperature to 760℃ and then they increased rapidly at temperatures above 760℃. At 850℃, the elongation attained a maximum and then dropped gradually with a rise of temperature up to 960℃. The deformation mechanism of the alloy was transformed from semi-brittleness into plasticity, which happens at 980℃. %R 10.11835/j.issn.1000-582X.2019.08.009 %U http://qks.cqu.edu.cn/cqdxzrcn/home %1 JIS Version 3.0.0