Fe3Al基合金拉伸和蠕变性能的改进

摘要

研究了合金化对Fe3Al力学性能的影响,结果表明加入微量的Ce对提高Fe3Al基合金室温塑性非常有效果.通过X-射线光电子能谱表层分析证明了微量Ce的加入改变了氧化物的化学组成,从而使试样表面快速钝化.用W,Ni或者Mo,尤其是W与Ni或者W与Mo复合合金化可以使Fe3Al基合金的高温强度和蠕变抗力明显提高.W、Ni或者Mo的加入会明显改善合金的微观组织,它们在合金中能够形成含有W的类似M6C碳化物形式的沉淀相.%Effects of alloying processing on tensile test properties of Fe3Al-based alloys have been studied. Results show that microalloying of cerium is very effective on increasing the room temperature ductility of Fe3Al-based alloys. Surface analysis by XPS demonstrates that cerium addition causes the change in the oxide chemistry and provides rapid passivation of the specimen surface. The high temperature strength and creep resistance of Fe3Al-based alloys can be significantly enhanced by alloying additions of tungsten, niobium or molybdenum, especially when combined additions of tungsten with niobium or molybdenum are used. The additions of tungsten, niobium or molybdenum also result in the significant microstruetural refinement and the formation of fine precipitates which are identified as M6C-type carbide in the alloys containing tungsten.