The influence of defect and temperature on the fatigue behaviours of Al‐Si‐Cu‐Mg‐Ni alloy

Fatigue and Fracture of Engineering Materials and Structures - Tập 42 Số 10 - Trang 2372-2382 - 2019
Haiquan Liu1,2, J.C. Pang1, Meng Wang1,2, Jianping Li3, Yongchun Guo3, Shouxin Li1, Zhefeng Zhang1,2
1Materials Fatigue and Fracture Laboratory, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China
2School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an 710021, China

Tóm tắt

AbstractHigh‐cycle fatigue (HCF) properties of two Al‐Si‐Cu‐Mg‐Ni alloys with different defect sizes named as alloys A (smaller ones) and B (bigger ones) were investigated at 350°C and 425°C, respectively. The results indicate that fatigue strengths of both alloys decrease as the temperature increases. Fatigue cracks originated from pores and oxide films at both temperatures. They propagated preferentially through cracked matrix at 350°C and debonded interface and grain boundary at 425°C. Alloy A exhibits higher fatigue life and fatigue strength than alloy B at 350°C due to its smaller pore sizes. However, it has slightly worse fatigue properties than alloy B at 425°C because the fatigue crack initiation is controlled by oxide film at this temperature and is not affected by its size. This indicates that there is a transition of predominant initiation site from pores to oxide films when the temperature increases. The fatigue strength estimated through defect size is consistent with the experimental results at 350°C, while unsuitable at 425°C.

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Thông tin xuất bản

Fatigue and Fracture of Engineering Materials and Structures

Tập 42 Số 10

2372-2382

Thông tin tác giả