Effect of intermetallic particles and grain boundaries on short fatigue crack growth behaviour in a cast Al-4Cu-3Ni-0.7Si piston alloy

被引：14
|
作者：
Mbuya, T. O. [1 ]
Gu, Y. [2 ]
Thomson, R. C. [2 ]
Reed, P. A. S. [1 ]
机构：
[1] Univ Southampton, Engn Mat Grp, Fac Engn & Environm, Southampton SO17 1BJ, Hants, England
[2] Loughborough Univ Technol, Dept Mat, Loughborough LE11 3TU, Leics, England
来源：
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES | 2017年 / 40卷 / 09期
关键词：
cast aluminium; fatigue; micromechanisms of fracture; piston alloys; short fatigue cracks; AL-SI ALLOYS; ALUMINUM-SILICON ALLOYS; HEAT-TREATMENT; ELEVATED-TEMPERATURE; INITIATION; MICROSTRUCTURE; ELEMENTS; DEFECTS; MODEL; LIFE;
D O I：
10.1111/ffe.12586
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The short fatigue crack growth behaviour in a model cast aluminium piston alloy has been investigated. This has been achieved using a combination of fatigue crack replication methods at various intervals during fatigue testing and post-mortem analysis of crack profiles. Crack-microstructure interactions have been clearly delineated using a combination of optical microscopy, scanning electron microscopy and electron backscatter diffraction. Results show that intermetallic particles play a significant role in determining the crack path and growth rate of short fatigue cracks. It is observed that the growth of short cracks is often retarded or even arrested at intermetallic particles and grain boundaries. Crack deflection at intermetallics and grain boundaries is also frequently observed. These results have been compared with the long crack growth behaviour of the alloy.
引用
收藏
页码：1428 / 1442
页数：15
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