摘要
采用示差扫描量热卡计（ＤＳＣ）得到了非晶态Ｆｅ─Ｓｉ─Ｂ合金加入Ｃｕ和Ｎｂ后的等温晶化放热曲线，结合Ｘ射线衍射（ＸＲＤ）分析，明确了Ｃｕ和Ｎｂ在形成纳米α─Ｆｅ（Ｓｉ）晶体相时的作用．此外，非晶态Ｆｅ（７６．５）Ｓｉ（１３．５）Ｂ９Ｃｕ１和Ｆｅ（７３．５）Ｓｉ（１３．
The isothermal crystallization behavior of amorphous Fe(77.5)Si(13.5)B9, Fe(74.5)Si(13.5)B9Nb3, Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 (at.-%), have been investigated by differential scanning calorimetry (DSC) and X-ray diffraction (XRD). During the isothermal annealing process, Fe(77.5)Si(13.5)B9 exhibits two connected exothermal peaks, corresponding to the precipitation of crystalline α-Fe(Si) phase and Fe2B compound, resistively, and Fe(74.5)Si(13.5)B9Nb3 displays a symmetric exothermal Peak resulting from α-Fe(Si) and Fe(23)B6 and Fe3B, while both Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 show an asymmetric exothermal peak originating from the formation of α-Fe(Si) solid solution. Measurements from XRD data show that grain size of α-Fe(Si) phase is about 35nm and 10nm in the crystalline Fe(76.5)Si(13.5)B9Cu1 and Fe(73.5)Si(13.5)B9Cu1Nb3 samples, resistively. Though single crystalline phase of α-Fe(Si) can not be obtained in the crystallized Fe(74.5)Si(13.5)B9Nb3 alloy, its α-Fe(Si) crystalline phase is finer, about 15nm. Based on above results, it is concluded that Cu accelerates α-Fe nucleation process and Nb suppresses its growth, leading to theformation of the ultrafine nanocrystalline α-Fe(Si) phase. Moreover, the causes to the asymmetric α-Fe(Si) exothermal Peak in the Cureontaining alloys are discussed.
出处
《材料研究学报》
EI
CAS
CSCD
1994年第3期218-222,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金
关键词
纳米晶合金
晶化
金属玻璃
FeSiB
nanocrystalline alloy, crystallization,amorphous Fe-Si-B-Cu-Nb alloy
