Ti-Ni-Zr高成形性形状記憶合金のマイクロ折りたたみ構造の作製

DOI Web Site

書誌事項

タイトル別名
  • Micro folding structure fabrication of Ti-Ni-Zr high formable shape memory alloys

抄録

<p>We evaluated microforming ability and shape memory behaviors of Ti38Ni50Zr12 (at.%) high formable shape memory alloys (HFSMAs) for the fabrication of the micro folding structure such as foldable pipe structures. In the fabrication method of foldable pipe, at first, Ti-Ni-Zr thin film metallic glass (TFMG) sheet is creased by using micro jigs in the supercooled liquid region. Secondary, the both side edges of the sheet with creases are bonded together to make pipe structure. Finally, TFMG pipe with creases is annealed to be became SMAs. To foldable fabricate pipe structure, we evaluated microforming ability, shape memory behavior of folded SMAs, and bonding conditions. We succeeded to fabricate folded specimens with folding angle θ of 60° and 90°. In order to investigate shape memory behaviors, folded specimens were annealed at 873 K for 1 hour and become SMAs. Their shape memory behaviors were evaluated by bending tests during several thermal cycles, they showed good shape memory behaviors. We confirmed that folded specimens with folding angle θ of 60° and 90° can recover its shape without plastic deformation even if it was deformed to straight shape (θ=180°). We evaluated bonding conditions by using micro jigs between HFSMAs and bonding strength. As the results, when bonding pressure was 75 MPa, we succeeded the bonding process using viscous flow or diffusion bonding. Bonding strength increased with increasing bonding temperature. When bonding temperature was 673 K, the bonded specimen was crystallized and show bonding strength of more than 2.5 MPa. However, when bonding temperature was over 723 K, the specimens stuck with micro jig.</p>

収録刊行物

  • 年次大会

    年次大会 2017 (0), J2220105-, 2017

    一般社団法人 日本機械学会

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ