Dynamic fracture toughness of a t1-45ai-1.6mn alloy at high temperature

H. Fukumasu, T. Kobayashi, H. Toda, K. Shibue

研究成果: Contribution to journalArticle査読

6 被引用数 (Scopus)

抄録

Dynamic fracture toughness of a reactive sintered y-base TiAl alloy is studied in the temperature range from 298 to 1073 K. The stop block method is employed in order to observe the crack paths and microcrack distribution ahead of a main crack tip under dynamic loading conditions at high temperature. Fracture surface, crack path, and microcrack observations are carried out using a scanning electron microscope (SEM). Microcrack initiation criteria and crack-tip stress shielding effect caused by crack deflection are discussed. The experimental results demonstrate that the dynamic fracture toughness, JId, increases with increasing temperature, and after attaining the maximum value at 873 K, the toughness decreases. Crack path morphology varies with temperature. The stress shielding effect at the crack tip caused by main crack deflection was found to affect the difference in crack extension energy for each temperature. The number of microcracks ahead of a main crack varies with temperature. The stress shielding effect at the crack tip caused by microcracking was found to contribute to toughening around 873 K.

本文言語英語
ページ(範囲)3053-3061
ページ数9
ジャーナルMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
31
12
DOI
出版ステータス出版済み - 1 1 2000
外部発表はい

All Science Journal Classification (ASJC) codes

  • 凝縮系物理学
  • 材料力学
  • 金属および合金

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