TiAl合金由于高比强度和优异的高温力学性能,是一种极具应用潜力的轻质高温结构材料,但存在脆性大、室温塑性差以及800℃以上抗氧化能力不足是其工程应用的最大障碍.本文对TiAl合金的恒温氧化行为、氧扩散以及氧化后力学性能变化规律进行了总结.基于服役环境条件下合金中的氧扩散规律及受控机制,对改善合金高温抗氧化性能的表面处理和合金化研究现状进行了归纳.分析了TiAl合金高温抗氧化行为研究及其控制技术在今后一段时期的发展趋势.
TiAl-based alloys with high specific strength and excellent mechanical properties at elevated temperatures have been regarded as candidates for high-temperature structural applications in the aircraft and aerospace.However,low plasticity and oxidation resistance at temperatures above 800℃ are main obstacles for their practical applications.In this paper,oxidation behavior,oxygen diffusion and their effect on mechanical properties of TiAl-based alloys have been summarized.Considering oxygen diffusion behavior and its determining factors in the environment of practical applications,recent progress of surface treatment and alloying technique to improve the oxidation resistance of TiAl alloys has been also reviewed.Meanwhile,the possible near future developing directions of the oxidation resistance and its controlling techniques for TiAl-based alloys are forecasted.
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