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Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2021-09, Vol.825, p.141917, Article 141917
2021
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Autor(en) / Beteiligte
Titel
Enhanced high-cycle fatigue strength of Al–12Si–4Cu-1.2Mn-T6 cast aluminum alloy at room temperature and 350 C
Ist Teil von
  • Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2021-09, Vol.825, p.141917, Article 141917
Ort / Verlag
Lausanne: Elsevier B.V
Erscheinungsjahr
2021
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
  • As a promising material for application in lightweight automobile, Al–Si alloys are subjected to complex cyclic thermo-mechanical loading when employed in engines. This study examined the high-cycle fatigue behavior of Al–12Si–4Cu-1.2Mn-T6 cast aluminum alloy at room temperature (RT) and 350 °C and evaluated the effect of different second phases by microstructure observation and nano-indentation characterization. The high-cycle fatigue strength of the studied alloy at RT and 350 °C is 125.0 MPa and 47.5 MPa, respectively, exhibiting excellent fatigue resistance compared with other heat-resistant Al alloys. Fatigue cracks originate from casting defects at RT, but nucleate from primary Al15Mn3Si2 phase on the specimen surface at 350 °C. The modulus difference between α-Al15Mn3Si2 and α-Al phases is higher at 350 °C than at RT, allowing cracks to initiate and propagate more likely along the phase interface at 350 °C. The hardness and reduced modulus of α-Al15Mn3Si2 phase are greatly higher at 350 °C than at RT, both in the suspended specimen and the fractured specimen. The significant difference in residual stress between α-Al15Mn3Si2 and α-Al phases indicates that α-Al15Mn3Si2 phase bears more stress loading than α-Al phase during fatigue process, especially at 350 °C. The findings presented in this study may shed some light on the design of high-performance heat-resistant aluminum alloys. •The high-cycle fatigue strength of Al–12Si–4Cu-1.2Mn at RT and 350 °C is 125.0 Mpa and 47.5 Mpa, respectively.•Fatigue cracks originate from casting defects at RT, but nucleate from primary Al15Mn3Si2 phase at 350 °C.•The modulus difference between α-Al15Mn3Si2 and α-Al phases is higher at 350 °C than at RT.•α-Al15Mn3Si2 phase bears more stress loading than α-Al phase during fatigue process, especially at 350 °C.

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