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超高強度Mg-Gd-Y-Zn-Zr合金の疲労特性に関する基礎研究

研究課題

研究課題/領域番号 22KF0310
補助金の研究課題番号 22F22720 (2022)
研究種目

特別研究員奨励費

配分区分基金 (2023)
補助金 (2022)
応募区分外国
審査区分 小区分18010:材料力学および機械材料関連
研究機関九州大学

研究代表者

陳 強  九州大学, 工学研究院, 教授 (30264451)

研究分担者 CHEN YAO  九州大学, 工学研究院, 外国人特別研究員
研究期間 (年度) 2023-03-08 – 2025-03-31
研究課題ステータス 交付 (2023年度)
配分額 *注記
2,200千円 (直接経費: 2,200千円)
2024年度: 600千円 (直接経費: 600千円)
2023年度: 1,100千円 (直接経費: 1,100千円)
2022年度: 500千円 (直接経費: 500千円)
キーワードMg-RE alloy / Very-high-cycle fatigue / Nano-precipitates / Crack nucleation / Damage accumulation / Very high cycle fatigue / Crack initiation / Oxidation / Oxygen embrittlement
研究開始時の研究の概要

The proposed research is to undertake quasi-in situ fatigue observation to characterize fatigue transitions from a crack-free stage to a cracked stage, and further short crack growth stage. This study aims at revealing dislocation structures associated with nucleation of microcracks and connecting atomic scale deformation with macroscopic fatigue performance.

研究実績の概要

We investigated the very high cycle fatigue behavior of a long-period stacking ordered (LPSO) strengthened Mg alloy under both solution and aging conditions. The main microstructural difference between the two conditions is characterized by dense β' nano-precipitates under the aging condition. The fatigue strengths are comparable under both conditions, whereas the fatigue lives tend to be improved apparently under the aging condition. The improved fatigue lives under the aging condition are attributed to the dense β' nanoprecipitates, which delay the processes of crack initiation and early propagation. Plastic localization shows a continuous pattern along the damage bands under the solution condition, while it shows a scattered pattern along the damage bands under the aging condition due to the effect of β' nano-precipitates, which affect the fatigue crack nucleation mechanism.

現在までの達成度 (区分)
現在までの達成度 (区分)

2: おおむね順調に進展している

理由

As planned, macroscopic fatigue properties and damage localizations under solution and aging conditions have been investigated on the LPSO-strengthened Mg alloy. The results obtained have been submitted to the journal of Materials Science & Engineering A and International Journal of Fatigue. Further research will be conducted to improve the macroscopic fatigue properties through regulating the microstructure via heat treatment. On the whole, we have achieved the research goals set up for FY2023, and the progress of the project was partially advanced.

今後の研究の推進方策

Stacking faults (SFs) enhance non-basal dislocation sources in magnesium, addressing its ductility challenges. Therefore, we are interested in the fatigue response of the SFs-strengthened Mg alloy. We will systematically engineer two types of Mg alloy with the same laminated nanostructures: one with profuse SFs and one with dense LPSO lamellae. This will enable a comparative investigation of the fatigue response between the SFs-strengthened Mg and the LPSO-strengthened Mg. We are interested in which is more effective in enhancing the fatigue properties, and the corresponding fatigue mechanisms.

報告書

(2件)
  • 2023 実施状況報告書
  • 2022 実績報告書
  • 研究成果

    (3件)

すべて 2023 その他

すべて 国際共同研究 (1件) 雑誌論文 (2件) (うち国際共著 2件、 査読あり 2件)

  • [国際共同研究] Sichuan University/Chengdu University(中国)

    • 関連する報告書
      2023 実施状況報告書
  • [雑誌論文] Fatigue-induced oxidation assisting microcrack nucleation in Mg-RE alloy under ultrasonic fatigue2023

    • 著者名/発表者名
      Chen Yao、Shuai Qi、Wu Yujuan、Peng Liming、Shao Xiaohong、Liu Fulin、He Chao、Li Lang、Liu Yongjie、Wang Qingyuan、Xie Shaoxiong、Chen Qiang
    • 雑誌名

      Scripta Materialia

      巻: 236 ページ: 115643-115643

    • DOI

      10.1016/j.scriptamat.2023.115643

    • 関連する報告書
      2023 実施状況報告書
    • 査読あり / 国際共著
  • [雑誌論文] Oxide nodule assisting fatigue crack initiation in hierarchical anisotropic nanostructured Mg-RE alloy2023

    • 著者名/発表者名
      Chen Yao、Shuai Qi、Wu Yujuan、Peng Liming、Shao Xiaohong、Liu Fulin、He Chao、Li Lang、Liu Yongjie、Wang Qingyuan、Xie Shaoxiong、Chen Qiang
    • 雑誌名

      International Journal of Fatigue

      巻: 175 ページ: 107820-107820

    • DOI

      10.1016/j.ijfatigue.2023.107820

    • 関連する報告書
      2023 実施状況報告書
    • 査読あり / 国際共著

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公開日: 2022-11-17   更新日: 2024-12-25  

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