Enhanced ductility and strength in a cast Al–Mg alloy with high Mg content

Enhanced ductility and strength in a cast Al–Mg alloy with high Mg content
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高镁含量铸造铝镁合金的延展性和强度得到提高

DOI:
10.1016/j.msea.2021.140806
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发表时间:
2021-03
影响因子:
6.4
通讯作者:
Dahle Arne K.
Dahle Arne K.
中科院分区:
材料科学1区
文献类型:
--
作者:
Liu Zhibo;Sun Jiani;Yan Zhigang;Lin Yaojun;Liu Manping;Roven Hans J.;Dahle Arne K.

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高镁含量的铸造铝镁合金由于其极低的质量密度和增强的镁固溶强化效果而引起了人们的极大兴趣。然而,由于脆性Al3Mg2相数量的增加,这类铸造Al-Mg合金的塑性差是一个挑战。本工作旨在通过延长固溶处理时间和/或提高固溶处理温度来改善铸造Al-10wt%Mg合金的塑性,从而最小化Al3Mg2相的数量。随着时间的延长和/或温度的升高,Al_3Mg_2含量减少,溶质镁含量增加,塑性和强度均有所提高。在425℃9h或438℃3h的固溶处理使Al3Mg2相完全溶解,平均延伸率为~27%,平均0.2%的偏置屈服强度为~186 Mpa。讨论了提高延性和强度的机理。
Cast Al–Mg alloys with high Mg content have attracted considerable interest as a result of exceptionally low mass density and enhanced Mg solid-solution strengthening effect. However, poor ductility in this class of cast Al–Mg alloys originating from the increased amount of brittle Al3Mg2phase presents a challenge. This work aims to improve ductility of a cast Al-10 wt%Mg alloy by prolonging time and/or increasing temperature during solid-solution treatment, hence minimizing the amount of the Al3Mg2phase. The amounts of Al3Mg2decrease and the concentrations of solute Mg increase with prolonging time and/or increasing temperature, improving both ductility and strength. Solid-solution treatment at 425 °C for 9 h or at 438 °C for 3 h induces complete dissolution of the Al3Mg2phase, achieving an average uniform elongation of ~27% accompanied by an average 0.2% offset yield strength of ~186 MPa. The mechanisms improving both ductility and strength are discussed.
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