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1.
論文 |
渡邊, 千尋 ; Watanabe, Chihiro
概要:
金沢大学理工研究域機械工学系<br />各種析出強化型銅合金に,高圧ねじり(HPT)加工を施し,加工硬化量及び,時効硬化挙動に付いて系統的な調査を行った.HPT加工による到達最高硬さ,及び続く時効強化挙動に及ぼす加工温度の影響を明らかにした
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.さらに,HPT加工後の自然時効が,続く人工時効に及ぼす影響についても明らかにした.以上の結果は,巨大ひずみ加工による結晶粒超微細化と析出強化の重畳の実現へ新たな知見を与えるものである.<br />The microstructure and aging behavior in Cu based age-hard enable alloys processed by high-pressure torsion (HPT) were systematically investigated. The effects of processing temperature on attainable maximum hardness by HPT and age-hardening behavior of the alloys after HPT were clearly explained. Moreover, the influence of natural aging on the artificial aging behavior of Cu-Be and Cu-T alloys systems were discussed. The obtained results in this study shed light on strengthening of the metallic materials by grain-refinement strengthening and precipitation hardening simultaneously.<br />研究課題/領域番号:25420775, 研究期間(年度):2013-04-01 - 2016-03-31
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2.
論文 |
渡邊, 千尋 ; Watanabe, Chihiro
概要:
金沢大学理工研究域機械工学系<br />超微細粒バルクナノ純チタン(BN-Ti)の,組織と機械的性質を調査した.多軸鍛造加工時のパスひずみが大きいほど結晶粒が細かく強度も上昇しやすいことを明らかにした.変形機構は,結晶粒径の増加に従って,柱
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面すべり+錐面すべり→柱面すべり+変形双晶へと遷移する事が明らかとなった.このような変形メカニズムについて,計算力学的観点から考察も行った.BN-Tiは生体用材料として魅力的な性質を持つ.そこで,BN-Tiに表面酸処理を施し、その骨細胞の生体接触挙動を調査した.市販Tiと比較して,表面処理後のBN-Tiでは骨細胞の接触角が極めて小さくなり、生体反応が優れることが示された.<br />Microstructure and mechanical properties of ultrafine-grained bulk nano-structured commercial purity titanium (BN-Ti) were systematically investigated. It was clarified that the larger the pass strain during the multi-directional forging processing, the finer the grains, and the higher the strength. The deformation mechanism of the BN-Ti transitions from "prismatic slip + pyramidal slip" to "prismatic slip + deformation twinning" as the grain size increases. The deformation mechanisms were also discussed from the viewpoint of computational mechanics.The BN-Ti has attractive properties as a biomaterial. The surface treatments of BN-Ti were carried out, and the biological contact behavior of the bone cells was investigated. The BN-Ti after the surface treatments exhibited that the contact angle of bone cells was extremely small and the biological reaction was superior, compared with the conventional commercial purity Ti.<br />研究課題/領域番号:17H03409, 研究期間(年度):2017-04-01 - 2020-03-31<br />出典:「TWIP効果を利用したバルクナノ工業用純チタンの超高強度化と高延性化の実現」研究成果報告書 課題番号17H03409(KAKEN:科学研究費助成事業データベース(国立情報学研究所))(https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-17H03409/17H03409seika/)を加工して作成
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