電磁成形した A1050 アルミニウム板の電磁成形挙動と高速変形組織

Translated title of the contribution: Magnetic pulse forming behavior and the high speed deformation structure of A1050 aluminum sheet

Takashi Kambe, Shinji Muraishi, Shinji Kumai

Research output: Contribution to journalArticlepeer-review

Abstract

An A1050 aluminum sheet was collided against a steel mold with a small V-shaped through-thickness groove by magnetic pulse forming (MPF), and the deformation structure was investigated. The local changes in strain rate, strain and temperature during MPF were investigated by using a series of numerical analyses. Almost no change in grain morphology was observed at the mid-thickness area of the sheet. In contrast, an extremely large intensive deformation occurred at the aluminum sheet surface located in the groove. The ultrafine grains of several to several tens of nanometers were observed on the surface of the aluminum sheet. The changes in strain rate, strain and temperature were also investigated by using ANSYS AUTODYN. The simulation results revealed that the sheet flew into the groove at an extremely high local strain rate exceeding 107 s-1. Furthermore, a large temperature increase exceeding 1000 K at the sheet surface was estimated by the simulation. The cooling process was also reproduced by OpenFOAM. It was revealed that the rapid cooling of 108〜109 K/s order occurred on the sheet surface. It is considered that the ultrafine grains observed at the sheet surface resulted from the local melting and the successive rapid cooling.

Translated title of the contributionMagnetic pulse forming behavior and the high speed deformation structure of A1050 aluminum sheet
Original languageJapanese
Pages (from-to)51-59
Number of pages9
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume71
Issue number1
DOIs
Publication statusPublished - Jan 15 2021
Externally publishedYes

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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