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为改善Fe-24Al合金的脆性,对其进行La合金化,同时对合金进行不同工艺的固溶处理。利用金相、显微硬度、压缩性能、XRD等方法研究合金铸态、固溶态的微观组织与力学性能的关系。结果表明,稀土元素La的加入使Fe-24Al合金铸态的晶粒得到了明显的细化,硬度与抗压强度有所下降,但塑性明显提升。经过固溶处理后,其相为α-Fe、FeAl相、Fe3Al相,而且经过825℃与850℃固溶处理后还出现了Fe4Al8La相。Fe-24Al-La合金抗压强度最大为1 250 MPa,但是塑性同Fe-24Al合金相比有显著提升,825℃与850℃固溶处理的塑性最好,压缩曲线最平滑,而且不存在断裂点。
In order to improve the brittleness of Fe-24Al alloy, La-alloying is carried out and the alloy is solution-treated in different processes. The microstructure and mechanical properties of as-cast and solid solution alloys were investigated by means of metallography, microhardness, compressibility and XRD. The results show that the addition of rare earth element La makes the as-cast grains of Fe-24Al alloy to be obviously refined, the hardness and compressive strength decrease, but the plasticity obviously increases. After solution treatment, the phase is α-Fe, FeAl phase, Fe3Al phase, and after 825 ℃ and 850 ℃ solution treatment also appeared Fe4Al8La phase. The compressive strength of Fe-24Al-La alloy is up to 1 250 MPa, but its plasticity is obviously improved compared with that of Fe-24Al alloy. The plasticity of solution treatment at 825 ℃ and 850 ℃ is the best, the compression curve is the most smooth, and there is no fracture point.