Effect of Y content on microstructure evolution and tensile properties of Mg-8Li-3Al-2Sn-xY alloys

IF 1.8 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Express Pub Date : 2024-09-17 DOI:10.1088/2053-1591/ad78b2

Yang Zhang, Shunping Sun and Xiaoyang Chen

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引用次数: 0

Abstract

The design of new ultra-light Mg-Li alloys have great significance in aerospace and other fields. In this paper, Sn and Y elements were simultaneously added into Mg-8Li-3Al (wt%) alloy and the effect of Y content on microstructure evolution and tensile properties of Mg-8Li-3Al-2Sn-xY (wt%) alloys was studied. The as-cast Mg-8Li-3Al-2Sn alloy is composed of α-Mg + β-Li duplex-phase matrix, fine MgLiAl2 phase and coarse fishbone-like Li2MgSn phase. As Y element is added, granular Al2Y phase is formed, and grain size of α-Mg phase decreases significantly with shape changing from well-developed coarse dendritic to equiaxed dendritic. After hot extrusion, α-Mg phase is elongated along the extrusion direction, and β-Li phase undergoes complete dynamic recrystallization and transforms into fine equiaxed grains. The addition of 0.5% Y improves the tensile properties of as-cast Mg-8Li-3Al-2Sn-0.5Y alloy. However, the tensile properties show a downward trend with further increase of Y content. Hot extrusion significantly enhances the tensile properties of Mg-8Li-3Al-2Sn-xY alloys. Similarly, strength reaches the highest when the Y content is 0.5% for extruded Mg-8Li-3Al-2Sn-xY alloys.

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Y 含量对 Mg-8Li-3Al-2Sn-xY 合金微观结构演变和拉伸性能的影响

新型超轻镁锂合金的设计在航空航天等领域具有重要意义。本文在 Mg-8Li-3Al (wt%) 合金中同时添加了 Sn 和 Y 元素，研究了 Y 含量对 Mg-8Li-3Al-2Sn-xY (wt%) 合金微观结构演变和拉伸性能的影响。铸造时的 Mg-8Li-3Al-2Sn 合金由 α-Mg + β-Li 双相基体、细 MgLiAl2 相和粗鱼骨状 Li2MgSn 相组成。随着 Y 元素的加入，形成了粒状的 Al2Y 相，α-Mg 相的晶粒尺寸显著减小，形状从发达的粗树枝状转变为等轴树枝状。热挤压后，α-镁相沿挤压方向拉长，β-锂相发生完全的动态再结晶，转变为细小的等轴晶粒。添加 0.5%Y 可改善铸态 Mg-8Li-3Al-2Sn-0.5Y 合金的拉伸性能。然而，随着 Y 含量的进一步增加，拉伸性能呈下降趋势。热挤压能明显提高 Mg-8Li-3Al-2Sn-xY 合金的拉伸性能。同样，当挤压 Mg-8Li-3Al-2Sn-xY 合金的 Y 含量为 0.5% 时，强度达到最高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Express MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

4.50

自引率

4.30%

发文量

640

审稿时长

12 weeks

期刊介绍： A broad, rapid peer-review journal publishing new experimental and theoretical research on the design, fabrication, properties and applications of all classes of materials.