Enhancing strength and γ’-coarsening resistance through micro-alloying additions to an oxidation resistant Al-Co-Cr-Fe-Ni-Ti compositionally complex alloy

Journal of Alloys and Metallurgical Systems Pub Date : 2024-10-31 DOI:10.1016/j.jalmes.2024.100122

Jithin Joseph , Murugesan Annasamy , Peter Hodgson , Matthew Barnett , Daniel Fabijanic

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Abstract

The effect of alloying additions of Mo and Ta (0.4 at% each) on the microstructure, mechanical properties, oxidation resistance and coarsening resistance of the L1₂-strengthened (γ’) Al-rich Ni₅₁Co₁₈Fe₅Cr₁₀Al₁₂Ti₄ alloy was determined. The micro-alloyed composition exhibited improved yield strength (from room temperature to 1000 ^°C) and coarsening resistance (enhanced by 33 % at 800 ^°C) compared to the base Ni₅₁Co₁₈Fe₅Cr₁₀Al₁₂Ti₄ alloy. The present Al-rich alloy compositions (both the micro-alloyed and reference compositions) exhibited superior oxidation resistance (800–1000 ^°C) compared to a Ti-rich Ni₅₁Co₁₈Fe₅Cr₁₀Al₈Ti₈ alloy (with similar precipitate volume fraction and (Al+Ti)-content) and commercial Inconel 718. The present work highlights the promise of Al-rich γ’-strengthened Al-Co-Cr-Fe-Ni-Ti alloys as candidates for high-performance, high-temperature structural materials, characterised by an attractive blend of strength, resistance to coarsening, and resilience against oxidation.

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通过在抗氧化的 Al-Co-Cr-Fe-Ni-Ti 成分复杂合金中添加微合金来提高强度和抗γ'-焦化性

测定了添加 Mo 和 Ta（各 0.4%）对 L12 强化（γ'）富铝 Ni51Co18Fe5Cr10Al12Ti4 合金的微观结构、机械性能、抗氧化性和抗粗化性的影响。与基体 Ni51Co18Fe5Cr10Al12Ti4 合金相比，微合金成分显示出更高的屈服强度（从室温到 1000 °C）和抗粗化性能（在 800 °C 时提高 33%）。与富钛的 Ni51Co18Fe5Cr10Al8Ti8 合金（具有相似的沉淀体积分数和（Al+Ti）含量）和商用 Inconel 718 相比，目前的富铝合金成分（包括微合金化成分和参考成分）表现出卓越的抗氧化性（800-1000 °C）。本研究强调了富 Al γ'-强化 Al-Co-Cr-Fe-Ni-Ti 合金作为高性能高温结构材料候选材料的前景，其特点是兼具强度、抗粗化性和抗氧化性。

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Journal of Alloys and Metallurgical Systems

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0.50

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