Journal
MATERIALS CHARACTERIZATION
Volume 144, Issue -, Pages 264-273Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2018.07.008
Keywords
Retrogression and re-aging treatment; Intergranular corrosion; Precipitation hardening; Al-Mg-Zn alloy
Categories
Funding
- Major State Research and Development Program of China [2016YFB0300801]
- National Natural Science Foundation of China [51571013, 51301017]
- State Key Lab of Advanced Metals and Materials [2017-Z06]
- Beijing Laboratory of Metallic Materials and Processing for Modern Transportation China
- Fundamental Research Funds for the Central Universities [FRF-GF-17-A1]
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The effects of retrogression and re-aging treatment on the intergranular corrosion behavior of Al-5.0Mg-3.0Zn alloys are systematically studied. The alloys strength increases when retrogression temperature increases from 390 degrees C to 420 degrees C. Samples retrogressed at 390 degrees C then re-aged are very susceptible to intergranular corrosion and those retrogressed at 405 degrees C and 420 degrees C express good corrosion resistance. Then the alloys corrosion susceptibility rises with increasing retrogression temperature. Grain boundary precipitates are coarsened and distributed discontinuously with decreasing retrogression temperature. Higher retrogression temperature results in higher Mg and Zn content difference and intergranular corrosion susceptibility.
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