Strength and plasticity improvement induced by strong grain refinement after Zr alloying in selective laser-melted AlSiMg1.4 alloy

Zr合金化引起的强晶粒细化作用同步提升激光选区熔化AlSiMg1.4合金的强度和塑性

In order to enhance the mechanical properties of the selective laser-melted(SLM) high-Mg content AlSiMg1.4 alloy,the Zr element was introduced.The influence of Zr alloying on the processability,microstructure,and mechanical properties of the alloy was systematically investigated through performing microstructure analysis and tensile testing.It was demonstrated that the SLM-fabricated AlSiMg1.4-Zr alloy exhibited high process stability with a relative density of over 99.5% at various process parameters.Besides,the strong grain refinement induced by the primary Al3Zr particle during the melt solidification process simultaneously enhanced both the strength and plasticity of the alloy.The values for the yield strength,ultimate tensile strength,and elongation of the SLM-fabricated AlSiMg1.4-Zr were(343±3) MPa,(485±4) MPa,and(10.2±0.2)%,respectively,demonstrating good strengthplasticity synergy in comparison to the AlSiMg1.4 and other Al-Si-based alloys fabricated by SLM.

为了提升激光选区熔化(SLM)成形高Mg含量AlSiMg1.4合金的力学性能,引入Zr合金化元素,并通过显微组织的分析和拉伸性能的测试研究Zr合金化对SLM成形AlSiMg1.4合金成形性、组织和力学性能的影响。结果表明,在不同成形工艺参数下,SLM成形AlSiMg1.4-Zr合金的相对密度均超过99.5%,表现出优异的工艺稳定性。此外,AlSiMg1.4-Zr合金在熔体凝固过程中初生的Al3Zr纳米颗粒起到了强烈的晶粒细化作用,同步提升了合金的强度和塑性。沉积态AlSiMg1.4-Zr合金的屈服强度、极限抗拉强度和伸长率分别为(343±3) MPa、(485±4)MPa和(10.2±0.2)%,与SLM成形AlSiMg1.4合金和其他Al-Si基铝合金相比,展现出良好的强塑性协同效应。