Fatigue Crack Growth Behaviour of Precipitate-Strengthened CuNi2Si Alloy under Different Loading Modes

被引：5
|
作者：
Yang, Bing [1 ]
Li, Yifan [1 ]
Qin, Yahang [1 ]
Zhang, Jiwang [1 ]
Feng, Bo [1 ]
Liao, Zhen [1 ]
Xiao, Shoune [1 ]
Yang, Guangwu [1 ]
Zhu, Tao [1 ]
机构：
[1] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Sichuan, Peoples R China
来源：
MATERIALS | 2020年 / 13卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Cu-Ni-Si alloy; fatigue performance; loading mode; crack growth; NICKEL-BASED SUPERALLOY; GRAIN-SIZE; PROPAGATION BEHAVIORS; FRACTURE BEHAVIORS; CU-6NI-1.5SI ALLOY; INITIATION; MICROSTRUCTURE; SPECIMENS; 7075-T6; LIFE;
D O I：
10.3390/ma13102228
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this study, fatigue crack tests of CuNi2Si alloys using the replica technique under symmetrical tensile-compression loading, and rotational-bending loading were carried out with the same nominal stress amplitude. Observation and analysis results indicate that under different load types, the cracks display a trend of slow initiation growth and then rapid growth. The critical point is identified at the approximate value of 0.8 of the fatigue life fraction, and the crack growth rate of the sample under tensile-compression load is approximately an order of magnitude higher than that under rotational-bending load, resulting in the average life of the former being significantly shorter than the latter. Combining the observation results of the fractographical analysis and the surface-etched sample replica film, it can be seen that whether it is a tensile-compression load or a rotational-bending load, cracks mainly propagate in intergranular mode after initiation.
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页数：14
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