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Effect of Li addition on mechanical properties and ageing precipitation behavior of extruded Al−3.0Mg−0.5Si alloy

Li元素对 Al−3.0Mg−0.5Si 挤压合金力学性能和时效析出行为的影响

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Abstract

The effect of Li (2.0 wt%) addition on mechanical properties and ageing precipitation behavior of Al−3.0Mg−0.5Si was investigated by tensile test, dynamic elasticity modulus test, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) images. The results show that the tensile strength of the Li-containing alloy can be significantly improved; however, the ductility is sharply decreased and the fracture mechanism changes from ductile fracture to intergranular fracture. The elasticity modulus of the Li-containing alloy increases by 11.6% compared with the base alloy. The microstructure observation shows that the Li addition can absolutely change the precipitation behavior of the base alloy, and δ′-Al3Li phase becomes the main precipitates. Besides, β″-Mg2Si and δ′-Al3Li dual phases precipitation can be visibly observed at 170 °C ageing for 100 h, although the quantity of δ′-Al3Li phase is more than β″-Mg2Si phase. The width of the precipitate-free zone (PFZ) of the Li-containing alloy is much wider at the over-ageing state than the base alloy, which has a negative impact on the ductile and results in the decrease of elongation.

摘要

本文对比研究了添加 2.0 wt%Li 元素与不添加 Li 元素的 Al−3.0Mg−0.5Si 挤压合金的室温拉伸性 能、 动态弹性模量和时效析出行为. 结果表明, 添加 Li 元素在降低合金密度的同时, 还提高了合金的 强度和弹性模量, 但也导致合金的伸长率大幅度减小, 断裂机制从韧性断裂转变为沿晶断裂. 微观组 织观察显示, Li 元素的添加改变了合金的时效析出行为, δ′-Al3Li 相成为主要析出强化相. 含Li 合金在 170 °C 时效 100 h 后, 有明显的球状δ′-Al3Li 相和针状 β″-Mg2Si 相双相析出现象. 此外, 含 Li 合金过时 效状态下的无沉淀析出带宽度更大, 对合金的塑性产生不利影响, 造成伸长率下降.

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Authors and Affiliations

  1. State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., Ltd., Beijing, 100088, China

    Xiao-kun Yang  (杨晓琨), Bai-qing Xiong  (熊柏青), Xi-wu Li  (李锡武), Li-zhen Yan  (闫丽珍), Zhi-hui Li  (李志辉), Yong-an Zhang  (张永安), Ya-nan Li  (李亚楠), Kai Wen  (温凯) & Hong-wei Liu  (刘红伟)

  2. GRIMAT Engineering Institute Co., Ltd., Beijing, 101407, China

    Xiao-kun Yang  (杨晓琨), Xi-wu Li  (李锡武), Li-zhen Yan  (闫丽珍), Yong-an Zhang  (张永安), Ya-nan Li  (李亚楠), Kai Wen  (温凯) & Hong-wei Liu  (刘红伟)

  3. General Research Institute for Nonferrous Metals, Beijing, 100088, China

    Xiao-kun Yang  (杨晓琨), Bai-qing Xiong  (熊柏青), Xi-wu Li  (李锡武), Li-zhen Yan  (闫丽珍), Zhi-hui Li  (李志辉), Yong-an Zhang  (张永安), Ya-nan Li  (李亚楠), Kai Wen  (温凯) & Hong-wei Liu  (刘红伟)

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  1. Xiao-kun Yang  (杨晓琨)
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Corresponding author

Correspondence to Bai-qing Xiong  (熊柏青).

Additional information

Foundation item

Project(2016YFB0300802) supported by the National Key Research and Development Program of China

Contributors

YANG Xiao-kun provided the concept, analyzed the measured data and wrote the original draft; XIONG Bai-qing provided the concept and methodology; LI Xi-wu, YAN Li-zhen and WEN Kai reviewed and edited the draft; LI Zhi-hui and ZHANG Yong-an provided the concept and project administration; LI Ya-nan and LIU Hong-wei provided the resources and supervision.

Conflict of interest

YANG Xiao-kun, XIONG Bai-qing, LI Xi-wu, YAN Li-zhen, LI Zhi-hui, ZHANG Yong-an, LI Ya-nan, WEN Kai, LIU Hong-wei declare that they have no conflict of interest.

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Yang, Xk., Xiong, Bq., Li, Xw. et al. Effect of Li addition on mechanical properties and ageing precipitation behavior of extruded Al−3.0Mg−0.5Si alloy. J. Cent. South Univ. 28, 2636–2646 (2021). https://doi.org/10.1007/s11771-021-4798-3

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