Research on the microstructure,fatigue and corrosion behavior of permanent mold and die cast aluminum alloy |
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Affiliation: | 1. Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstraße 5, 91058 Erlangen, Germany;2. Vyatskiy State University, Moscow street 36, 610000 Kirov, Kirov region, Russia;3. Technische Universität Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany;1. Universidade Federal do ABC (UFABC), Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), 09210-580 Santo André, SP, Brazil;2. Laboratório de Processamento e Caracterização de Materiais, Faculdade de Tecnologia de São Paulo (FATEC), 01124-060 São Paulo, SP, Brazil |
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Abstract: | Permanent mold (PM) and high pressure die cast (HPDC) AlMg5Si2Mn are employed to investigate the microstructure, fatigue strength and corrosion resistance. Results indicated that the mechanical properties (Rm, R0.2 and δ) of HPDC specimens (314 MPa, 189 MPa and 7.3%) are significantly better than those of PM specimens (160 MPa, 111 MPa and 2.5%) due to the finer grain size and less cast defects. Fatigue cracks of PM samples dominantly initiated from shrinkage pores and obscure fatigue striations are observed in crack growth region. Corrosion and pitting potentials of PM and HPDC AlMg5Si2Mn alloy are around −1250 mV, −760 mV and −1220 mV, −690 mV respectively. Numerous pits are observed around the grain boundaries because the corrosion potential of Mg2Si is more anodic than that of α-Al matrix. In addition, the superior corrosion resistance of HPDC samples can be attributed to the fine grain size and the high boundary density which improved the formation of oxide layer on the surface and prevented further corrosion. |
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Keywords: | Corrosion behavior Microstructure High pressure die cast Aluminum alloy Marine industry |
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