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Related Experiment Video

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Hot Deformation Behavior and Microstructural Evolution Based on the Processing Map of Dual-Phase Mg-Li Based Alloy.

Jiangtao Guo1,2,3, Shengli Guo1,2,3,4, Yazhao Shen1,2,3

  • 1State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., Ltd., Beijing 101407, China.

Materials (Basel, Switzerland)
|February 15, 2022
PubMed
Summary

This study reveals optimal hot deformation conditions for Mg-Li-Al-Zn-Si alloys, identifying safe processing windows to achieve uniform microstructures and promote dynamic recrystallization (DRX). Unsafe zones are characterized by uneven microstructures and flow behavior.

Keywords:
Mg-Li-Al-Zn-Si alloyconstitutive modeldynamic recrystallizationhot compressionprocessing map

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Area of Science:

  • Materials Science
  • Metallurgy
  • Mechanical Engineering

Background:

  • Understanding the hot deformation behavior of advanced alloys is crucial for optimizing manufacturing processes.
  • Magnesium-lithium alloys offer unique properties but require careful control during thermomechanical processing.
  • Previous studies have not fully elucidated the constitutive relationships and microstructural evolution during hot working of Mg-Li-Al-Zn-Si alloys.

Purpose of the Study:

  • To investigate the hot deformation behavior of as-extruded Mg-Li-Al-Zn-Si alloy.
  • To establish a constitutive model predicting flow stress under varying temperature and strain rate conditions.
  • To construct a processing map and identify optimal hot working parameters for desirable microstructural evolution.

Main Methods:

  • Hot compression testing across a temperature range of 180-330 °C and strain rate range of 0.01-10 s-1.
  • Development of a constitutive equation incorporating the Zener-Hollomon parameter, Arrhenius term, and strain effects.
  • Construction of a processing map at a strain of 0.7 to delineate safe and unsafe deformation domains.
  • Microstructural analysis of different domains to understand the dynamic recrystallization (DRX) mechanisms.

Main Results:

  • A precise constitutive equation was developed, accurately predicting flow stress within 240-330 °C.
  • Unsafe deformation domains were identified at low (<230 °C) or high (>280 °C) temperatures and high strain rates (>1 s-1), associated with uneven microstructures.
  • The optimal hot deformation region was found between 270-300 °C, achieving a peak power dissipation efficiency of 0.44.
  • Dynamic recrystallization (DRX), both continuous and discontinuous, was observed in the safe domain, with triple points acting as nucleation sites for the β-phase.

Conclusions:

  • The established constitutive model accurately describes the flow stress behavior of the Mg-Li-Al-Zn-Si alloy during hot deformation.
  • Processing maps effectively identify safe and unsafe zones, guiding the selection of optimal hot working parameters.
  • The safe deformation domain promotes dynamic recrystallization, leading to a refined and uniform microstructure, crucial for alloy performance.