Scholarlink

<p>The effect of microstructure, particularly precipitate size, on the high-temperature oxidation behavior of a Ni–10Cr–14Al–0.05Zr alloy with a γ + γ’ two phase structure was systematically investigated in this study. The size of the γ’ precipitates was found to influence both the initial oxidation behavior and the transition to the formation of a protective Al<sub>2</sub>O<sub>3</sub> scale. Specimens with fine precipitates formed a homogeneous but less protective thick oxide scale, whereas those with coarse precipitates exhibited two distinct oxidation behaviors associated with the γ and γ’ phases. The transition to protective oxidation tended to occur earlier in specimens with fine precipitates, likely due to the enhanced outward diffusion of Al resulting from the higher density of γ/γ’ interfaces, which act as preferential site for decomposition. Once a continuous protective oxide scale had formed, precipitate size had limited effects on the high-temperature oxidation behavior.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of γ’ Precipitate Size on the High Temperature Oxidation Resistance of Alumina-Forming γ + γ’ Two-Phase Alloys

  • 期刊论文

  • 发表日期：

    2026年7月1日

查看全文
  • Zhentao Wang,
  • Shigenari Hayashi,
  • Suzue Yoneda,
  • Ali Shaaban,
  • Mitsutoshi Ueda

摘要

The effect of microstructure, particularly precipitate size, on the high-temperature oxidation behavior of a Ni–10Cr–14Al–0.05Zr alloy with a γ + γ’ two phase structure was systematically investigated in this study. The size of the γ’ precipitates was found to influence both the initial oxidation behavior and the transition to the formation of a protective Al2O3 scale. Specimens with fine precipitates formed a homogeneous but less protective thick oxide scale, whereas those with coarse precipitates exhibited two distinct oxidation behaviors associated with the γ and γ’ phases. The transition to protective oxidation tended to occur earlier in specimens with fine precipitates, likely due to the enhanced outward diffusion of Al resulting from the higher density of γ/γ’ interfaces, which act as preferential site for decomposition. Once a continuous protective oxide scale had formed, precipitate size had limited effects on the high-temperature oxidation behavior.