采用固体粉末包埋工艺将Ce/Cr涂层均匀分布在开孔Ni?Cr?Fe泡沫合金表面.利用静态压缩试验对Ce/Cr涂层改性Ni?Cr?Fe泡沫合金的力学性能进行研究.同时,对静态压缩条件下Ce/Cr涂层Ni?Cr?Fe泡沫合金的变形和破坏机制进行讨论.研究结果表明:添加不同含量的CeO2粉对Ce/Cr涂层泡沫合金力学性能产生较大影响.虽然与初始Ni?Cr?Fe泡沫合金相比密度增加,但是Ce/Cr涂层泡沫合金的屈服强度和能量吸收性能明显提高.尤其2%Ce/Cr(质量分数)涂层泡沫合金的能量吸收性能为初始Ni?Cr?Fe泡沫合金的1.9倍.此外,Ce/Cr涂层泡沫合金的力学性能随着应变速率的增加而增加.扫描电子显微镜(SEM)观察显示变形和开裂是Ce/Cr涂层泡沫合金主要的变形行为.
The Ce/Cr coating was homogenously deposited onto the reticulated open-cell Ni?Cr?Fe alloy foam by the pack cementation process. The mechanical properties of the Ce/Cr coated alloy foams were investigated by the quasi-static compression test. Simultaneously, the deformation and failure mechanisms of Ce/Cr coated alloy foams were discussed. The results show that the adding amount of CeO2 powders influences the mechanical properties of the Ce/Cr coated alloy foams. Despite an increase in density as compared to the uncoated foams, the Ce/Cr coated foams exhibit improvement in both yield strength and energy- absorption performance. Especially, the energy-absorption performance of 2% Ce/Cr (mass fraction) coated alloy foam is averagely 1.9 times as high as that of the bare Ni?Cr?Fe alloy foam. In addition, the mechanical properties of the Ce/Cr coated alloy foams increase with the increase of strain rate. The distortion and cracking are mainly the deformation behavior of the Ce/Cr coated alloy foam, confirmed by SEM images.
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