碱土金属对镁合金组织形成及性能的影响。

Influence of Alkaline Earth Metals on Structure Formation and Magnesium Alloy Properties.

作者信息

Shalomeev Vadym, Tabunshchyk Galyna, Greshta Viktor, Nykiel Marek, Korniejenko Kinga

机构信息

National University Zaporizhzhya Polytechnik, 64 Zhukovs'kogo Street, 69063 Zaporizhzhya, Ukraine.

Faculty of Materials Engineering and Physics, Cracow University of Technology, Jana Pawła II 37, 31-864 Cracow, Poland.

出版信息

Materials (Basel). 2022 Jun 20;15(12):4341. doi: 10.3390/ma15124341.

DOI:10.3390/ma15124341

PMID:35744400

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9229381/

Abstract

The main aim of this work is to improve the structure and properties of the magnesium alloy ML5 by modifying it with alkaline earth metals (ALM). The separate and joint influence of calcium and barium on the macrostructure and microstructure of the alloy of Mg-Al-Zn system was investigated. The qualitative and quantitative estimation of the structural components was carried out. Alkali earth metals were included in complex intermetallic phases and serve as additional crystallization centers. Modification of magnesium alloys with alkaline earth metals is established in an amount of 0.05 to 0.1 wt. % increased the bulk percentage of intermetallic phases by ~1.5 times, shifting them towards smaller size groups while simultaneously forming spherical intermetallic phases located in the grain centre and serving as additional crystallization centers. In this case, grain size reduction and significant refinement of the alloy structural components were provided. The dependency of the separate and joint influence of alkali earth metals on the castings complex of properties of the magnesium alloy has been established. Thus, a separate modification of the ML5 alloy provided the maximum level of its strength and ductility with the addition of 0.1% Ca or Ba. The modification of the complex (0.1% Ca + 0.1% Ba) of the magnesium alloy decreased the dimensions of its structural components 1.5 times and increased the strength of the alloy by 20%, the ductility by 2 times and the long-term heat resistance 1.5 times due to the formation of the intermetallic phases of the complex composition. Linear dependences were obtained that describe the influence of the characteristics of the structural components of the modified magnesium alloy on its mechanical properties. The developed technology for modifying cast magnesium alloys with alkaline earth elements provides an improvement in casting quality and allows the reliability and durability of responsible casting operation.

摘要

这项工作的主要目的是通过用碱土金属（ALM）对镁合金ML5进行改性来改善其结构和性能。研究了钙和钡对Mg-Al-Zn系合金宏观结构和微观结构的单独及联合影响。对结构成分进行了定性和定量评估。碱土金属包含在复杂的金属间相中，并作为额外的结晶中心。确定用碱土金属对镁合金进行改性的用量为0.05至0.1 wt.%，这使金属间相的体积百分比增加了约1.5倍，使其向更小尺寸的组转变，同时形成位于晶粒中心的球形金属间相并作为额外的结晶中心。在这种情况下，实现了晶粒尺寸减小和合金结构成分的显著细化。已经确定了碱土金属的单独及联合影响对镁合金铸件综合性能的依赖性。因此，对ML5合金进行单独改性时，添加0.1%的钙或钡可使其强度和延展性达到最高水平。镁合金的复合改性（0.1%钙 + 0.1%钡）使其结构成分的尺寸减小了1.5倍，合金强度提高了20%，延展性提高了2倍，长期耐热性提高了1.5倍，这是由于形成了复合成分的金属间相。获得了线性关系，描述了改性镁合金结构成分特征对其力学性能的影响。所开发的用碱土元素改性铸造镁合金的技术提高了铸造质量，并提高了关键铸造操作的可靠性和耐久性。