TiAl基合金以其低的密度, 优异的高温强度, 良好的抗氧化性和抗蠕变性等特点获得极大关注, 成为一种很有希望的航空、航天及汽车用高温合金, 但室温脆性严重制约了TiAl基合金的工业化应用. 分析了TiAl基合金室温韧性差的原因, 介绍了改善室温脆性的具体途径, 包括添加合金化元素、制备工艺的不断优化以及复合增强等, 从而改善了TiAl基合金室温脆性, 并概述了TiAl基合金的应用研究.
TiAl-based alloys were paid more attention due to their low density, excellent high-temperature strength, high oxidation resistance and creep resistance, and became potential candidate materials in automotive and aerospace industry for high-temperature structural application. However, the low room temperature plasticity limited their industrialized application. Brittleness of TiAl-based alloys at room temperature was analyzed; it could be improved by adding alloying elements, optimizing preparation process and reinforcing combination.
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