Oxidation behavior and mechanical properties of a directionally solidified high Nb TiAl based alloy between 800 °C and 900 °C

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-10-31 DOI:10.1016/j.intermet.2024.108538

Xuesong Xu , He Liang , Hongsheng Ding , Karl P. Davidson , R.V. Ramanujan , Ruirun Chen , Jingjie Guo , Hengzhi Fu

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Abstract

The high temperature oxidation behavior and mechanical property response of a directionally solidified Ti-46Al-7Nb-0.4W-0.6Cr-0.1B alloy were investigated. The ultimate tensile strength of the alloy at 800 °C, 850 °C and 900 °C are 647 MPa, 590 MPa and 508 MPa, respectively, and the tensile fracture mode changed from brittle cleavage fracture to micro-void accumulation ductile fracture. At lower temperatures Al₂O₃ forms first, growing along the γ lamellae to form oxide bands aligned with the lamellar orientation. The oxidation mass gain of the alloy after 900 °C/100 h isothermal oxidation is only 0.91 mg/cm². The oxidation kinetics results show the microalloyed high Nb TiAl alloy has excellent oxidation resistance, which is due to the formation of a TiO₂ layer containing Nb, Cr and W, the AlNb₂ phase and an Al/Cr rich transition layer above the directionally solidified lamellar matrix.

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800 ℃ 至 900 ℃定向凝固的高铌钛铝基合金的氧化行为和机械性能

研究了定向凝固 Ti-46Al-7Nb-0.4W-0.6Cr-0.1B 合金的高温氧化行为和力学性能响应。合金在 800 ℃、850 ℃ 和 900 ℃ 时的极限拉伸强度分别为 647 MPa、590 MPa 和 508 MPa，拉伸断裂模式从脆性劈裂断裂转变为微空洞堆积韧性断裂。在较低温度下，Al2O3 首先形成，沿着 γ 薄片生长，形成与薄片取向一致的氧化带。合金在 900 °C/100 h 等温氧化后的氧化质量增量仅为 0.91 mg/cm2。氧化动力学结果表明，微合金化高 Nb TiAl 合金具有优异的抗氧化性，这是由于在定向凝固的片状基体上方形成了含有 Nb、Cr 和 W 的 TiO2 层、AlNb2 相和富 Al/Cr 过渡层。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.