レーザ積層造形法と電子ビーム積層造形法で作製したAC8A アルミニウム合金のミクロ組織と引張特性

Translated title of the contribution: Microstructure and tensile strength of AC8A aluminum alloy fabricated by laser-based powder bed fusion and electron-based powder bed fusion

Mitsuru Adachi, Tomo Okuhira, Shigeto Yamasaki, Masatoshi Mitsuhara, Hideharu Nakashima, Shuji Koiwai, Yoshiki Hashizume, Isao Murakami, Daisuke Terada

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanical properties of JISAC8A alloys (Al-12%Si-1%Mg-1%Ni-1%Cu alloy) fabricated by laser-based powder bed fusion (LB) or electron-based powder bed fusion (EB) or gravity casting (CAST) were studied by means of tensile tests at room temperature and 300°C. These alloys were under two types of heat-treatment sequences. One was a T6 treatment, which was corresponding to the heat treatment at 500°C for 2h and 170°C for 4 h, followed by the annealing at 300°C for 10 h. Another was directly annealed at 300°C for 10 h after the fabrication. In the annealed specimens without T6 treatment, the LB alloy showed the highest strength and best elongation at room temperature and 300°C, because eutectic Si particles and Al-Ni-Cu-Fe compounds formed very fine network structure in Al matrix. In the annealed specimens with T6 treatment, the tensile strength at room temperature did not depend on the fabrication methods but the LB alloy showed the best elongation because of finer and isotropic shape of secondary phase particles. The annealed CAST alloy showed the highest strength at 300°C, and the annealed LB alloy showed the lowest strength at 300°C.

Translated title of the contributionMicrostructure and tensile strength of AC8A aluminum alloy fabricated by laser-based powder bed fusion and electron-based powder bed fusion
Original languageJapanese
Pages (from-to)206-213
Number of pages8
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume72
Issue number5
DOIs
Publication statusPublished - 2022

All Science Journal Classification (ASJC) codes

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

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