The Effect Of Adulteration On The Fe Based Alloys Prepared By MA And The Studies Of Their Magnetic Properties

Becoming amorphous and nanometer size is a new trend for magnetic materials. The nanometer materials have all kinds of excellent properties, so more and more researchers in the material field were attracted. Recently, mechanical alloying (MA) has opened a way for making nano and amorphous materials by ball-milling process at room temperature. This method need simple facilities, and is easy for commercial application. The powder gained is easy for molding, which provides another way to manufacture more excellent materials. We discussed the effect of the adulteration. There are two parts in this article: the first, we studied the effect of Si on Fe-Co-C alloy. We hoped to improve the glass-forming ability of Fe-Co-C alloy. The second, we discussed the effect of C on Fe-Al. The structure and magnetic properties of the products made in this way were studied by XRD, VSM and SEM. The conclusions as follows:(1) Fe-Co-C is easy to form amorphous if we add some Si in it. Fe40Co40C15Si5(at%) is easier to form amorphous than Fe40Co40C10Si10(at%) under the same condition. By analyzing the magnetic properties, we found that the magnetic properties of Fe-Co-C can be improved by adding a bit of Si. As to Fe40Co40C15Si5 and Fe40Co40C10Si10, whose magnetic properties improve with the time and the energy increasing(2) Fe-Co-C-Si cannot amorphous thoroughly, which have imitated relation with the time. The sample milled for 20h has the best result (3) Fe-Al alloy can be refined by adding some C in it. We found the alloy have the best result when the weight ratio of C is about 0.2-1wt%, when the milling time is 30h.A bit of Fe3C was formed during MA(4) Furthermore, the weight of other elements cannot too high, which will do harm to the properties of the Fe-Al alloy. In our study, we found Fe-Al alloys milled for 60h and the ratio of ball to powder is 30:1 have the best magnetic properties. When the ratio of ball to powder is 40:1, the magnetic properties become worse...