Ultrafine-grained magnesium-lithium alloy processed by high-pressure torsion: Low-temperature superplasticity and potential for hydroforming

Hirotaka Matsunoshita, Kaveh Edalati, Mitsuaki Furui, Zenji Horita

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

A Mg-Li alloy with 8wt% Li was processed by severe plastic deformation (SPD) through the process of high-pressure torsion (HPT) to achieve ultrafine grains with an average grain size of ~500nm. Tensile testing with an initial strain rate of 10-3s-1 showed that the alloy exhibited superplasticity at a temperature of 323K or higher. Tensile testing in boiling water confirmed that the specimens were elongated to 350-480% at 373K under the initial strain rates of 10-3s-1 to 10-2s-1 with a strain rate sensitivity of ~0.3. The current study suggests that not only superplastic forming but also superplastic hydroforming should be feasible after the grain refinement using the HPT method.

Original languageEnglish
Pages (from-to)443-448
Number of pages6
JournalMaterials Science and Engineering A
Volume640
DOIs
Publication statusPublished - Jul 9 2015

Fingerprint

lithium alloys
hydroforming
Lithium alloys
superplasticity
Superplasticity
magnesium alloys
Magnesium alloys
Torsional stress
strain rate
torsion
Strain rate
Tensile testing
superplastic forming
Grain refinement
boiling
Temperature
Boiling liquids
plastic deformation
Plastic deformation
grain size

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Ultrafine-grained magnesium-lithium alloy processed by high-pressure torsion : Low-temperature superplasticity and potential for hydroforming. / Matsunoshita, Hirotaka; Edalati, Kaveh; Furui, Mitsuaki; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 640, 09.07.2015, p. 443-448.

Research output: Contribution to journalArticle

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