Abstract

An Al–Mg alloy with a wide solidification range is studied in the solid–liquid state as a function of quantitative and qualitative contents of transition group metals. The influence of microalloying with transition and rare-earth metals on solidification, the mechanical properties, and the structure in the solid–liquid state; the linear shrinkage in the solidification range; and the deformability margin of Al–Mg alloys is found. These factors cause the formation of hot cracks in casting and welding. The influence of separate and combined microalloying by transition and rare-earth metals on the technological properties of Al–Mg alloys is investigated. The deformability margin of magnaliums in the solidification range is determined. Unlike other methods for estimating the cracking resistance, we revealed the role of elementary components of this complex technological property, namely, relative elongation and linear shrinkage. This helped us to thoroughly analyze the nature of the action of microalloying by transition elements and the microstructure of a wide-range magnalium on its hot-shortness.

中文翻译：

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凝固范围内铸铝镁合金的物理力学性能和组织形成

摘要

研究了固态-液态状态下固溶范围较广的Al-Mg合金与过渡族金属的定量和定性含量的关系。过渡金属和稀土金属的微合金化对固液状态下的凝固，力学性能和结构的影响；凝固范围内的线性收缩；并发现了Al-Mg合金的形变裕度。这些因素导致在铸造和焊接中形成热裂纹。研究了过渡金属和稀土金属的单独和组合的微合金化对Al-Mg合金技术性能的影响。确定了镁在凝固范围内的变形极限。与其他估算抗裂性的方法不同，我们揭示了这种复杂技术特性的基本组成部分的作用，即相对伸长率和线性收缩率。这有助于我们彻底分析过渡元素进行微合金化的性质，以及大范围镁合金对其热脆性的微观结构。