Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 21, Issue 3, Pages 443-448Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(11)60734-6
Keywords
Al-Si-Mg alloy; dislocation; Mg(2)Si; secondary silicon phase
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Funding
- National Basic Research Program of China [2007CB714704]
- National Natural Science Foundation of China [50771073]
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The effects of microstructural characteristics on the fatigue behavior in Al-Si-Mg alloy were investigated. The dislocation substructures of Al-Si-Mg alloy were observed by transmission electron microscopy ( TEM). Dislocation evolution process of alpha(Al) matrix with [011] orientation of Al-Si-Mg alloy specimens was observed during fatigue process under different stress amplitudes and cycles. The results indicate that dislocation structure is closely dependent on stress amplitudes, and the density of dislocation in failure specimens increases with increasing stress amplitudes. The results show that Mg(2)Si and secondary silicon phase could have a strong hindrance effect on the movement of dislocations during the fatigue process. The fatigue behavior is strongly dependent on the microstructure of material.
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