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Microstructures and strengthening mechanisms of Mg−8.2Gd−4.6Y−1.5Zn−0.4Zr alloy containing LPSO, β′, and γ type phases
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jre.2020.05.012
Xiangsheng Xia , Kui Zhang , Minglong Ma , Ting Li

Abstract The microstructures and strengthening mechanisms of the Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr (wt%) alloy with long-period stacking ordered (LPSO), β′ and γ type phases were systematically studied. The results show that the LPSO with lamellar and block structures forms near the grain boundaries. The grains are clearly refined, and the 18R LPSO phase is oriented along the extrusion direction after extrusion. Some particles also precipitate from the Mg matrix dynamically. The extruded alloy exhibits a remarkable age-hardening response, and mechanical properties, with a tensile strength (TS) of 449 MPa, yield strength (YS) of 362 MPa, and elongation of 7.9% obtained in the peak-aged alloy. The strengthening mechanisms of the alloy in different states are discussed. Grain boundary and precipitation strengthening are the main strengthening mechanisms for the peak-aged alloy.

中文翻译:

含LPSO、β'和γ型相的Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr合金的显微组织和强化机制

摘要 系统研究了Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr (wt%)长周期堆积有序(LPSO)、β'和γ相合金的显微组织和强化机制。结果表明,在晶界附近形成了具有层状和块状结构的LPSO。晶粒明显细化,挤压后18R LPSO相沿挤压方向取向。一些颗粒也从镁基体动态沉淀。挤压合金表现出显着的时效硬化反应和机械性能,拉伸强度 (TS) 为 449 MPa,屈服强度 (YS) 为 362 MPa,峰值时效合金的伸长率为 7.9%。讨论了合金在不同状态下的强化机制。
更新日期:2020-10-01
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