## 4 Conclusions  
This work was carried out to understand the correlation the corrosion resistance with the microstructure, intermetallic compounds, and micro-voids of crept HPDC AA365 alloys affected by various temperatures and stresses. The conclusions are as mentioned below.  
1 In all crept AA365 alloys, intermetallic precipitates were located at \(\alpha\)-Al grain boundaries due to the fact that grain boundaries have higher energy than intergranular grain, promoting the production of intermetallic compounds at the boundaries. With regard to voids, as the temperature increased, the presence of porosities raised comparatively, owing to the diffusion of micro-voids. In terms of the density of the intermetallic phases, crept AA365 alloy at 473 K has a large amount of the secondary phases in comparison with crept AA365 alloys at 373 K and 573 K. The unstable supersaturated \(\alpha\)-Al accounted for the highest density of the intermetallic compounds in crept AA365 alloy at 473 K. By contrast, crept AA365 alloy at 573 K possessed the lowest density of the intermetallic precipitates because of the re-dissolution of the phases at 573 K occurred.
2 The corrosion characteristics of all crept AA365 alloys showed that the corrosion potentials were similar to the pitting potential (E\({}_{\text{pit}}\)) with the rapid increase in current density on the anodic branch. Furthermore, the corrosion potentials exhibited \(-687\), \(-684\), and \(-673\) mV\({}_{\text{SCE}}\) of crept AA365 alloys at 373 K, 473 K, and 573 K, respectively, implying that the corrosion happened quickly on the crept AA365 alloy at 473 K rather than at 373 K or 573 K. The value of the corrosion current density (I\({}_{\text{corr}}\)) in the crept HPDC AA365 alloy at 473 K has the highest corrosion current density of \(13.3\times 10^{-6}\) Acm\({}^{-2}\), compared with other alloys.
3 It can be deduced that the high amount of intermetallic compounds gave rise to the severe corrosive effect and led to the harmful micro-galvanic corrosion of crept HPDC AA365 alloy rather than the point defects, including micro-voids, shrinkages, and trapped gas.  
The current research found the relationship between the corrosion and the microstructure, involving intermetallic compounds and micro-voids of crept HPDC AA365 aluminum alloy at temperatures ranging from 373 K to 573 K with various stresses. The consequences would help to guarantee the reliability and long-term structural performance of this application in the automobile industry.  
Conceptualization, S.P., C.A. and E.L.; validation, S.P., C.A. and E.L.; formal analysis, S.P., C.A. and E.L.; investigation, S.P., C.A. and E.L.; data curation. S.P. and C.A.; methodology, S.P. and C.A.; visualization, S.P. and C.A.; resources, S.P. and C.A.; writing--original draft preparation, S.P. and C.A.; supervision, E.L.; project administration, E.L.; funding acquisition, E.L.; writing--review and editing, E.L. All authors have read and agreed to the published version of the manuscript.  
This research was supported by the National Research Foundation of Korea (NRF) granted by the Korean Government (NRF-2019R1I1A3A01062863).  
Not applicable.  
The data presented in this study are available on request from the corresponding author.  
The authors declare no conflict of interest.