Intergranular Corrosion and Microstructural Evolution in a Newly Designed Al-6Mg Alloy

Materials

Seung-Yoon Yang¹  Shae-Kwang Kim¹  Bong-Hwan Kim¹  Nam-Seok Kim¹  Young-Ok Yoon¹  Da-Bin Lee¹  Seong-Ho Ha¹  Hyun-Kyu Lim¹  Kweon-Hoon Choi² 

[1] Advanced Process and Materials R&BD Group, Korea Institute of Industrial Technology (KITECH), Cheonan 31056, Korea;Department of Industrial Materials and Smart Manufacturing Engineering, Korea University of Science and Technology, Daejeon 34113, Korea;

关键词: light alloys;    Al-Mg;    high-strength;    mechanical properties;    intergranular corrosion;    precipitation;   

DOI  :  10.3390/ma14123314

来源: DOAJ

【 摘 要 】

In this work, the microstructure and corrosion behavior of a novel Al-6Mg alloy were investigated. The alloy was prepared by casting from pure Al and Mg+Al₂Ca master alloy. The ingots were homogenized at 420 °C for 8 h, hot-extruded and cold-rolled with 20% reduction (CR20 alloy) and 50% reduction (CR50 alloy). The CR50 alloy exhibited a higher value of intergranular misorientation due to a higher cold rolling reduction ratio. The average grain sizes were 19 ± 7 μm and 17 ± 9 μm for the CR20 and CR50 alloys, respectively. An intergranular corrosion (IGC) behavior was investigated after sensitization by a nitric acid mass-loss test (ASTM G67). The mass losses of both the CR20 and CR50 alloys were similar at early periods of sensitization, however, the CR20 alloy became more susceptible to IGC as the sensitization time increased. Grain size and β phase precipitation were two critical factors influencing the IGC behavior of this alloy system.

【 授权许可】

Unknown