中文摘要：

采用电弧熔炼法与高能球磨相结合的方法制备Y-Fe-Cr合金微粉,将制得的合金微粉放在真空石英管中在850℃下退火2h,采用XRD和SEM对合金粉的相结构及颗粒形貌进行分析,最后利用矢量网络分析仪对合金粉末的吸波性能进行分析;并以Y11Fe86Cr3为例研究热处理对Y-Fe-Cr合金微粉吸波性能的影响。结果表明：在吸波涂层厚度（d）为1.5mm的条件下,YxFe97-xCr3（x=7,9,11,13,摩尔分数,%）合金微粉都具有较好的宽频特性,在低频端,Y9Fe88Cr3的吸波性能优于其他合金的吸波性能,在7～18GHz频率范围内,Y7Fe90Cr3、Y11Fe86Cr3和Y13Fe84Cr3的反射率均小于-6dB;在d为1.8mm的条件下,在吸收峰附近,热处理后合金的反射率较热处理前的反射率得到明显改善,热处理前合金的吸收峰值为-10.5dB左右,而热处理后合金的吸收峰值达到-13.8dB左右,而且小于-10dB的带宽达到5GHz;在偏离吸收峰处,热处理不但达不到改善合金吸波性能的目的,甚至使合金的吸波性能变差。

英文摘要：

The Y-Fe-Cr alloy powders were prepared by the arc melting method and high energy ball milling,then the powders prepared were sealed in evacuated quartz tubes for homogenization annealing at 1123 K for 2 h.The phase structure and the microstructure of the alloys powders were analyzed by X-ray diffractometry and scanning electron microscopy,then their microwave absorbing properties were analyzed by vector network analyzer.And the effect of heat treatment on the powders by sample Y11Fe86Cr3 was studied.The results show that the YxFe97-xCr3（x=7,9,11,13,mole fraction,%） alloys powders have better wide-frequency characteristic under 1.5 mm of material thickness.At low frequency,the microwave absorbing properties of the Y9Fe88Cr3 alloy are better than those of the others.The reflectivity of Y7Fe90Cr3,Y11Fe86Cr3 or Y13Fe84Cr3 is lower than -6 dB at microwave ranging from 7 GHz to 18 GHz.The reflectivity obviously increases after heat treatment under 1.8 mm of material thickness;near the absorption peak,the least reflectivity turns from -10.5 dB to -13.8 dB,and the wide frequency of reflectivity under -10 dB achieves 5 GHz.Nevertheless,the heat treatment can not increase but decrease the microwave absorbing property except the region near the least reflectivity peak.