稀土Y对Co_(43)Fe_(20)Ta_(5.5)B_(31.5)合金的非晶形成能力及性能的影响

Effect of the Rare Earth Element Y on Glass-Forming Ability and Properties of Co_(43)Fe_(20)Ta_(5.5)B_(31.5) Alloy

采用单辊甩带和铜模吹铸法,制备了(Co43Fe20Ta5.5B31.5)100-xYx(x=0.5,1,1.5,2,2.5,3)合金薄带及φ2mm的圆棒。X射线衍射及差热扫描量热分析表明:当x=3时合金具有最大的玻璃形成能力,可以很容易地制备出φ2mm的非晶圆棒。该成分合金的约化玻璃转变温度Trg=0.657,参数γ=0.436,在所研究的系列成分中是最大的,这说明Trg和γ能够很好地表征Co-Fe-Ta-B合金的玻璃形成能力。压缩试验和磁滞回线测试表明,Y的添加导致Co-Fe-Ta-B非晶合金的压缩断裂强度和软磁性能急剧下降。φ2mm的(Co43Fe20Ta5.5B31.5)97Y3非晶圆棒的压缩断裂强度为1852MPa,断裂应变为0.18%。与Co43Fe20Ta5.5B31.5非晶合金相比,(Co43Fe20Ta5.5B31.5)97Y3非晶合金的磁滞回线上存在约327×79.6A/m的矫顽力,同时饱和磁感应强度也显著下降。

The （Co43Fe20Ta5.5B31.5）100-xYx （x=0.5, 1, 1.5, 2, 2.5, 3） amorphous ribbons and rods of 2 mm diameters were prepared by melt spinning and copper mold blowcasting method. The analysis of XRD and DSC test indicated that the rod amorphous of 2 mm diameter was easily prepared owing to the alloy （x=3） which the value of x is 3 with maximum glass forming ability. Because the value of the reduced glass transition temperature （Trg） and 7 of （Co43Fe20Ta5.5B31.5）97Y3 alloy were 0.657 and 0.436 respectively, which were maximum in the series chemical composition investigated, the glass forming ability of Co-Fe-Ta-B alloy was assessed by Trg and y.The results of compression test and hysteresis loops showed that the compressive fracture strength and soft magnetic property of the Co-Fe-Ta-B amorphous alloy decreased dramatically when Y was added. The compressive fracture strength and the fracture strain of （Co43Fe20Ta5.5B31.5）97Y3 amorphous rods of 2 mm diameter were 1852 MPa and 0.18%, respectively. Compared with Co43Fe20Ta5.5B31.5, the coercivity Hc was 327 × 79.6 A/m in the hysteresis loops of the （Co43Fe20Ta5.5sB31.5）97Y3 amorphous alloy, at the same time, the saturation magnetic flux density decreased distinctly.