Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys

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• 作者：Anthony G. Spangenberger^a ; ^{aspangenberger@wpi.edu} ; Diana A. Lados^a ; Mark Coleman^b ; Soran Birosca^b ; Mark C. Hardy^c
• 关键词：Small and long fatigue crack growth ; Microstructural mechanisms ; Electron backscatter diffraction ; Stress concentrations ; Aluminum alloys
• 刊名：International Journal of Fatigue
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：97
• 期：Complete
• 页码：202-213
• 全文大小：4784 K
• 卷排序：97

文摘

Eutectic Si size/morphology/distribution control fatigue crack growth mechanisms. Intergranular regions promote blocked slip and stress redistribution. Early crack growth is improved by fine grains and Al-Si interface strengthening. Eutectic Si is detrimental in later growth stages due to low fracture energy.