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一种新型镍基单晶高温合金拉伸性能研究
姜华1, 郭媛媛1, 卢宇1, 陈昊2
1.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;2.空军装备部驻北京地区第六军事代表室, 北京 100024
摘要:
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。
关键词:  镍基单晶高温合金  拉伸性能  断裂模式
DOI:10.11835/j.issn.1000-582X.2019.08.009
分类号:TG131
基金项目:北京市自然科学基金资助项目(2184132)。
Tensile properties of a new nickel-based single crystal superalloy
JIANG Hua1, GUO Yuanyuan1, LU Yu1, CHEN Hao2
1.Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, P. R. China;2.The Sixth Military Representative Office of Air Force Equipment Department in Beijing, Beijing 100024, P. R. China
Abstract:
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℃.
Key words:  nickel-based single crystal superalloy  tensile property  deformation mechanism
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