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用x光衍射和磁分析研究了非晶态Fe_5Co_(70)Si_(15)B_(10)合金在晶化过程中相結构的变化。当加热到490℃左右时,有两个晶态亚稳相MS-I_1和MS-I_2从非晶态基体中析出。MS-I_1和MS-I_2分別具有体心立方和六角晶体結构,与母金属合金中存在的两相結构相同。在晶态相所析出的温度,磁化强度随温度升高而急剧增加。随后是一个緩慢上升区。到560—590℃区間,磁化强度再次随溫度升高而較快地增加。在此阶段,残留的非晶态基体轉变为晶态相,亚稳态MS-I_1和MS-I_2部分地分解为金属合金和金属与类金属的化合物。最后,当温度再进一步升高时,这些化合物的晶粒长大;具有立方結构的MS-I_1相繼續分解,析出化合物后的立方合金相的点陣常数增加,标志析出物是富含鈷和硅的化合物。伴随整个相結构的变化,試样的硬度值也有显著变化。
The phase structure of amorphous Fe_5Co_ (70) Si_ (15) B_ (10) alloy during crystallization was studied by x-ray diffraction and magnetic analysis. When heated to about 490 ℃, there are two crystalline metastable phases MS-I_1 and MS-I_2 precipitated from the amorphous matrix. MS-I_1 and MS-I_2 have body-centered cubic and hexagonal crystal structures, respectively, which are the same as the two-phase structure existing in the parent metal alloy. At the temperature at which the crystalline phase precipitates, the magnetization sharply increases with increasing temperature. Followed by a slow rise area. To 560-590 ° C range, the magnetization again increases rapidly with increasing temperature. At this stage, the residual amorphous matrix transforms to a crystalline phase, and the metastable MS-I_1 and MS-I_2 are partially decomposed into metal alloys and metal and metalloid compounds. Finally, when the temperature is further increased, the grains of these compounds grow up. The cubic structure of MS-I_1 continues to decompose and the lattice constant of the cubic alloy phase after the compound is precipitated increases. The precipitates are rich in cobalt and Silicon compounds. With the change of the whole phase structure, the hardness value of the sample also changes significantly.