Developing a High Ductility Mg Alloy Via Non-basal Slips and Intergranular Coordination Induced by Li and Er Addition

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-02-10 DOI:10.1007/s12540-023-01620-6

Ruyue Tang, Jing Zhang, Bingcheng Li, Quan Dong

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Abstract

The poor ductility of magnesium (Mg) alloys at room temperature restricts its large-scale usage in industry. In this work, we design low-alloying Mg-3Li−xEr(x = 0.2, 0.8 wt%) alloys with high ductility. Quasi-in-situ electron back-scatter diffraction observation, combined with slip trace analysis and in-grain misorientation axes analysis, was carried out to systematically characterize the microstructural evolution and slip deformation mode during the tensile deformation of the Mg-3Li-xEr alloys. The results showed that the synergy effect of solute Li and Er dramatically reduces the critical resolved shear stress ratios between non-basal and basal slip, thus contributing to the activation of considerable non-basal dislocations. Additionally, Er microalloying increases the frequency of grain boundaries with misorientation angles (θ_s) being in the range of 75 < θs < 90°, enhancing intergranular coordination ability by activating more basal-slip-induced prismatic < a > slips.

Graphical abstract

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通过添加锂和铒诱导非基底滑移和晶间配位开发高延展性镁合金

镁（Mg）合金在室温下的延展性较差，限制了其在工业中的大规模应用。在这项研究中，我们设计了具有高延展性的低合金 Mg-3Li-xEr（x = 0.2，0.8 wt%）合金。通过准原位电子反向散射衍射观测，结合滑移轨迹分析和晶粒内错向轴分析，系统地表征了 Mg-3Li-xEr 合金拉伸变形过程中的微观结构演变和滑移变形模式。结果表明，溶质 Li 和 Er 的协同效应显著降低了非基底滑移和基底滑移之间的临界分辨剪应力比，从而促进了大量非基底位错的激活。此外，Er微合金化增加了晶界错向角（θs）在75 < θs < 90°范围内的频率，通过激活更多基底滑移诱发的棱柱位错来提高晶间协调能力。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.