Fe_3Al中加入少量的Ce,室温强度显著增高,而同时加入Ce和Cr,则可使强度和塑性均得到改善。含Ce的Fe_3Al其断口有大约70％的穿晶解理能断裂和30％的沿晶断裂。在Fe_?Al的形变试样中,观察到的主要是b=1/4a′_0〈111〉的单根位错。但含Cr的合金的形变试样中则可观察到大量的超点阵位错。
An addition of small amount Ce to Fe_3Al increases significantly theroom temperature strength, and a mixed addition of Ce and Cr improves both strengthand ductility. The fracture mode of Fe_3Al containing Ce is a mixed one of ap-proximately 70% transgranular cleavage and 30% intergranular failure. The disloca-tions observed are mainly single ones with b=1/4a′_0<111> in the deformed specimensof bare binary Fe_3Al, but a number of super-lattice dislocations in that with Cradded.
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