Aging precipitation behavior of 800 MPa grade ultra high strength aluminum alloy

Autor: ZANG Jin-xin, XING Qing-yuan, CHEN Jun-zhou, DAI Sheng-long
Jazyk: čínština
Rok vydání: 2021
Předmět:
Zdroj: Cailiao gongcheng, Vol 49, Iss 4, Pp 71-77 (2021)
Druh dokumentu: article
ISSN: 1001-4381
DOI: 10.11868/j.issn.1001-4381.2021.000241
Popis: The hardness, conductivity and room temperature tensile test were used to study the properties of the new aluminum alloy aged at 110-140 ℃ for different time.The microstructure of the alloy was observed by transmission microscope (TEM).The results show that the optimum aging process of the new aluminum alloy is aging at 110 ℃ for 24 h.Tensile strength, yield strength and elongation are 808,785 MPa,6.9%, respectively.Aging temperature is the main factor affecting the type, density and size of precipitates.When aged at 110 ℃,the main precipitations are GPⅠ zones,GPⅡ zones and metastable η' phase. After aging at 110 ℃ for a long time (up to 96 h), GPⅠ zones and GPⅡ zones still exist stably.Compared with aging at 110 ℃, the precipitation process accelerates at 140 ℃.After aging at 140 ℃ for 4 h, no GP zone is observed, and the main precipitate phase is η'.After aging at 140 ℃ for 24 h, the main precipitates are η' phase and η phase.
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