The Portevin-Le Chatelier effect and strain-rate-induced plasticity enhancement in Mg-4Li and Mg-4Li-1Al alloys

The effects of strain rate on deformation behavior of the Mg-4Li and Mg-4Li-1Al alloys were investigated through tension testing and microstructure analysis. The Portevin-Le Chatelier effect was detected in tension testing of Mg-4Li alloy in the strain rate range of 5 × 10 –4 s −1   ∼  1 × 10 –2 s −...

Full description

Saved in:
Bibliographic Details
Published in:Materials research express 2022-03, Vol.9 (3), p.36514
Main Authors: Sha, Guiying, Liu, Teng, Yin, Miao, Na, Yuduo
Format: Article
Language:English
Subjects:
Deformation effects
Elongation
Mg-Li alloy
plasticity enhancement
Portevin-le Chatelier effect
Serrated yielding
strain rate
Strain rate sensitivity
Tensile strength
Tension tests
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The effects of strain rate on deformation behavior of the Mg-4Li and Mg-4Li-1Al alloys were investigated through tension testing and microstructure analysis. The Portevin-Le Chatelier effect was detected in tension testing of Mg-4Li alloy in the strain rate range of 5 × 10 –4 s −1   ∼  1 × 10 –2 s −1 , and the effect was enhanced by the addition of 1% Al. The mechanism of Portevin-Le Chatelier effect was ascribed to the interaction between primary dislocations and pre-existing secondary forest dislocations. The strain rate sensitivity indexes of both Mg-4Li and Mg-4Li-1Al alloys were found as negative. With increasing strain rate, the yield strength and tensile strength of both alloys decreased, while the elongation increased.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ac4f85