河南理工大学学报（自然科学版）2024，Vol.43Issue(6)：194-200,7.DOI:10.16186/j.cnki.1673-9787.2023120081
Mn,Zr复合微合金化对6061铝合金铸轧板组织和力学性能的影响
Effect of Mn and Zr composite microalloying on the microstructure and mechanical properties of 6061 aluminum alloy cast-rolling plate
摘要
Abstract
Objectives To explore the effect of Mn and Zr composite microalloying on the microstructure and mechanical properties of 6061 aluminum alloy cast-rolling plates,three types of 6061 aluminum alloy cast-rolling plates with different compositions were prepared:the original 6061 aluminum alloy plate,the 6061-0.4Mn aluminum alloy plate with Mn added alone,and the 6061-0.4Mn-0.3Zr aluminum alloy plate with Mn and Zr added.Methods The microstructure and properties of the three types of 6061 aluminum alloy cast-rolling plates were studied using electron backscattered diffraction(EBSD),scanning electron micros-copy(SEM),room temperature tensile tests,and tensile fracture surface analysis.Results The results showed that Mn could refine the grain structure of the 6061 aluminum alloy cast-rolling plates,increase the proportion of small-angle grain boundaries,and inhibit recrystallization.Mn also promoted the transforma-tion of the AlFeSi phase to the α-AlFeMnSi phase,improved the morphology of the AlFeSi phase,reduced its volume fraction,inhibited its aggregation,and encouraged its dispersion.Room temperature tensile tests and fracture surface analysis revealed that while the addition of Mn alone improved the strength of the 6061 aluminum alloy cast-rolling plates,it significantly reduced plasticity,making the fractures brittle.In con-trast,composite microalloying with Mn and Zr significantly reduced the proportion of small-angle grain boundaries and enhanced the inhibition of recrystallization.of the microstructure of 6061 aluminum alloy cast-rolling plate.The formation of{100}<001>Cube texture in the microstructure achieved texture strengthening,further improving both strength and plasticity,with fractures exhibiting toughness.Conclu-sions The comprehensive mechanical properties of the Mn and Zr composite microalloyed 6061 aluminum alloy cast-rolling plates were superior.Compared to the plates with 0.4 wt.%Mn alone,the tensile strength,yield strength,and elongation increased by 18.8%,37.8%,and 59.5%,respectively.关键词
6061铝合金/微合金化/铸轧/织构强化Key words
6061 aluminum alloy/microalloying/casting and rolling/texture strengthening分类
矿业与冶金引用本文复制引用
孙玉崇,陈泽夫,徐振,田爽,刘志敏,张伟..Mn,Zr复合微合金化对6061铝合金铸轧板组织和力学性能的影响[J].河南理工大学学报（自然科学版）,2024,43(6):194-200,7.基金项目
国家自然科学基金资助项目(52104377) （52104377）
