孙玉崇,陈泽夫,徐振,等.Mn、Zr复合微合金化对6061铝合金铸轧板组织性能的影响[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2023120081.

SUN Y C,CHEN Z F,XU Z,et al．Effect of Mn and Zr composite microalloying on the microstructure and properties of 6061 aluminum alloy cast-rolling plate［J］.Journal of Henan Polytechnic University(Natural Science)，doi:10.16186/j.cnki.1673-9787.2023120081.

Mn、Zr复合微合金化对6061铝合金铸轧板组织性能的影响(网络首发)

孙玉崇¹，陈泽夫¹, 徐振¹，田爽¹，刘志敏¹，张伟^1,2

（1.辽宁科技大学 材料与冶金学院,辽宁 鞍山 114051;2.辽宁忠旺集团有限公司,辽宁 辽阳 111003)

摘要: 目的 为了探究Mn、Zr复合微合金化对6061铝合金铸轧板材组织和力学性能的影响，本工作分别制备了三种不同成分的6061铝合金铸轧板，分别为原始6061铝合金板材、单独添加Mn元素的6061-0.4Mn铝合金板材和Mn、Zr复合添加的6061-0.4Mn-0.3Zr铝合金板材。方法 采用EBSD、SEM、常温拉伸力学性能检测和拉伸断口分析等方式对三种的6061铝合金铸轧板的组织性能进行研究。结果 研究结果表明，Mn元素不仅可以细化6061铝合金铸轧板的晶粒组织、提高小角度晶界的比例、抑制再结晶。还可以促进AlFeSi相向α-AlFeMnSi相转变，改善AlFeSi相的形貌，减小AlFeSi相的体积分数、抑制AlFeSi相的聚集促使其弥散分布。常温拉伸力学性能检测和拉伸断口结果表明，与原始6061铝合金铸轧板相比，单独添加Mn元素的6061铝合金铸轧板强度提升，但塑性明显下降，且断口呈现为脆性。而Mn、Zr复合微合金化可以大幅降低小角度晶界比例，增强对6061铝合金铸轧板材组织再结晶的抑制作用。铸轧板组织中形成{100}<001>Cube织构，实现织构强化，进一步提高铸轧板的强度和塑性，此时断口呈现为韧性。结论 综合来看，Mn、Zr复合微合金化的6061铝合金铸轧板的综合力学性能更好，与单独添加0.4wt.%Mn的铸轧板相比，抗拉强度、屈服强度和延伸率分别提高了18.8%、37.8%、59.5%。

关键字:微合金化；铸轧；织构强化；组织性能

doi:10.16186/j.cnki.1673-9787.2023120081

基金项目: 国家自然科学基金资助项目（52104377）

收稿日期：2023-12-31

修回日期：2024-01-22

网络首发日期：2024-03-06

Effect of Mn and Zr composite microalloying on the microstructure and properties of 6061 aluminum alloy cast-rolling plate

SUN Yuchong¹, Chen Zefu¹, XU Zhen^1*, TIAN Shuang¹, LIU Zhimin¹, ZHANG Wei¹

( 1. Liaoning University of Science and Technology, Anshan 114051,Liaoning,China;2. Liaoning Zhongwang Group Co., Ltd.,Liaoyang 111003,Liaoning,China)

Abstract：Objective In order to explore the effect of Mn and Zr composite microalloying on the microstructure and mechanical properties of 6061 aluminum alloy cast-rolling plates, three kinds of 6061 aluminum alloy cast-rolling plates with different compositions were prepared in this work, namely the original 6061 aluminum alloy plate, the 6061-0.4Mn aluminum alloy plate with Mn element added alone and the 6061-0.4Mn-0.3Zr aluminum alloy plate with Mn and Zr composite added. Methods By using EBSD, SEM, room temperature tensile mechanical properties test and tensile fracture analysis, we studied the microstructure and properties of three kinds of 6061 aluminum alloy cast-rolling plates. Ｒesults The research results showed that the Mn element could not only refine the grain structure of 6061 aluminum alloy cast-rolling plate, increase the proportion of small angle grain boundaries, and inhibit the recrystallization, but also promote the transformation of AlFeSi phase to α-AlFeMnSi phase, improve the morphology of AlFeSi phase, reduce the volume fraction of AlFeSi phase, inhibit the aggregation of AlFeSi phase, and promote its dispersion distribution. The results of room temperature tensile mechanical properties test and tensile fracture surface analysis showed that compared with the original 6061 aluminum alloy cast-rolling plate, the strength of 6061 aluminum alloy cast-rolling plate with Mn element added alone was improved, but the plasticity was significantly decreased, and the fracture surface showed brittleness. In contrast, the composite microalloying of Mn and Zr could greatly reduce the proportion of small angle grain boundaries and enhance the inhibition effect on the recrystallization of the microstructure of 6061 aluminum alloy cast-rolling plate. The {100}<001> Cube texture was formed in the microstructure of the cast-rolling plate, which achieved the texture strengthening and further improved the strength and plasticity of the cast-rolling plate. At this time, the fracture surface presented toughness. Conclusion Overall, the comprehensive mechanical properties of the Mn and Zr composite microalloy 6061 aluminum alloy cast-rolling plate were better. Compared with the cast-rolling plate with 0.4 wt.% Mn alone, its tensile strength, yield strength, and elongation were increased by 18.8%,37.8%, and 59.5%, respectively.

Key words：microalloying; casting and rolling; texture strengthening; microstructure and properties