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摘要:
The precipitation and intergranular corrosion (IGC) behavior of Al-1.0Mg-0.6Si-Cu (wt.%) alloys with the addition of Cu ranged from 0.3 to 0.6 wt.% were investigated by optical microscope and transmission electron microscopy. The results indicated that the Cu addition significantly improves the hardness of the alloys during under-aging progress by accelerating the precipitation of GP zones. The addition of Cu has changed the composition of precipitation and facilitated the formation of beta ''-Mg5Si6 precipitates with high density and fine distribution. When the Cu content is added to 0.6 wt.%, the type of precipitation has changed. In addition to the needle-shaped beta '' phase, a new-plate Q ' phase precipitated during peak-aging conditions. The 0.6 wt.% Cu alloy shows superior strength with tensile yield strength of 328 MPa, ultimate tensile strength of 368 MPa, and elongation of 16.0%. However, the IGC resistance decreased with the Cu content increasing from 0.3 to 0.6 wt.%, which mainly resulted from the segregation of Cu elements and the formation of continuous Q ' precipitates at the grain boundaries.
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来源 :
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
ISSN: 0947-8396
年份: 2023
期: 4
卷: 129
2 . 7 0 0
JCR@2022
ESI学科: PHYSICS;
ESI高被引阀值:17
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