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04-03-2019

Microstructure and mechanical properties of magnesium–lithium alloy prepared by friction stir processing

Authors: Qian-Ying Che, Kuai-She Wang, Wen Wang, Li-Ying Huang, Tian-Qi Li, Xiao-Peng Xi, Pai Peng, Ke Qiao

Published in: Rare Metals | Issue 9/2021

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Abstract

In this study, the fine-grained Mg–Li alloy was prepared by friction stir processing (FSP). The microstructure and mechanical properties of the friction-stir-processed (FSPed) Mg–Li alloy were investigated. The result showed that FSP resulted in the grain refinement, and the average grain size of the β-Li phase was about 7.5 μm. Besides the α-Mg and β-Li phases, a small amount of Li₃Mg₇, Li₂MgAl and AlLi phases were obtained. Compared with the base metal (BM), the weakening of the crystallographic texture occurred in the FSPed material, and the c-axis of the α-phase and the <001> crystallographic orientation of the β-phase were tilted about 45° with respect to the transverse direction (TD). The average microhardness (HV 67.8) of the stir zone was higher than that of the BM (HV 61.5). The yield strength (YS) and the ultimate tensile strength (UTS) of the FSPed material were higher than those of the BM, while the elongation slightly reduced. Grain refinement had more significant effect on strength improvement compared with the texture variation for the FSPed material. The fracture surfaces of the BM and FSPed materials showed dimple characteristics.

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Title: Microstructure and mechanical properties of magnesium–lithium alloy prepared by friction stir processing
Authors: Qian-Ying Che
Kuai-She Wang
Wen Wang
Li-Ying Huang
Tian-Qi Li
Xiao-Peng Xi
Pai Peng
Ke Qiao
Publication date: 04-03-2019
Publisher: Nonferrous Metals Society of China
Published in: Rare Metals / Issue 9/2021
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI: https://doi.org/10.1007/s12598-019-01217-2

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