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Mechanical properties, corrosion behavior, and microstructure of Sr modified Al–9.2Mg–0.7Mn alloys
Author(s) -
Zhang Peng,
Xia Weijun,
Yan Hongge,
Chen Jihua,
Su Bin,
Li Xinyu,
Li Xinlei
Publication year - 2019
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201910893
Subject(s) - microstructure , intergranular corrosion , ultimate tensile strength , alloy , materials science , elongation , corrosion , metallurgy , strontium , phase (matter) , chemistry , organic chemistry
The influence of strontium (Sr) additions in the form of Mg–Sr master alloys from 0 to 0.6 wt% on the mechanical properties, corrosive nature, and microstructure of Al–9.2Mg–0.7Mn alloys is investigated. The material is studied in a fully annealed (O‐temper) and a sensitizing treatment at 150°C for 7 days. Here we demonstrate that there will be a new phase which might be (Al, Mg) 17 Sr 2 formed in the as‐cast microstructure. When the Sr content is 0.2 wt%, under the premise that the mechanical properties of completely annealed alloy change little (relative to the matrix: the ultimate tensile strength increases by 8 MPa and the elongation only decrease by 1.6%), the intergranular corrosion resistance is significantly improved. The specific performance is that the mass loss from intergranular corrosion decreases by more than 53% from the addition of 0.2 wt% Sr after sensitizing.