Microstructural effects on short fatigue crack propagation in cast Al-Si alloys

被引：3
|
作者：
Ren, Peirong [1 ]
Withers, Philip J. [2 ]
Zuo, Zhengxing [1 ]
Feng, Huihua [1 ]
Huang, Weiqing [1 ]
机构：
[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
[2] Univ Manchester, Henry Royce Inst, Dept Mat, Manchester M13 9PL, England
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2023年 / 175卷
基金：
英国工程与自然科学研究理事会; 欧洲研究理事会;
关键词：
Short fatigue crack; Crack behaviour; Microstructure; Cast Al -Si alloy; GRAIN-BOUNDARIES; PART I; GROWTH; BEHAVIOR; MECHANISMS; SURFACE; MODEL; SIMULATION; PREDICTION; ROUGHNESS;
D O I：
10.1016/j.ijfatigue.2023.107788
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The role of microstructure on the short fatigue crack behaviour of cast Al-Si alloy under high cycle loading conditions is investigated by tracking the progress of cracks through fine, medium and coarse microstructured samples. Generally, in the early stage of crack growth, short cracks mainly grow transgranularly, with cracks growth close to low index crystallographic planes (mainly {100}) in some grains and frequently inhibited at grain boundaries. In the late stage, the crack growth mode gradually shifts from crystallographic stage-I to noncrystallographic stage-II. The short cracks grow faster and fluctuate significantly according to local microstructure. Our results show that finer microstructures offer greater crack nucleation and propagation resistance.
引用
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页数：15
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