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분말 압연법에 의한 Fe80.5Si6.5B12C1 및 Co70.3Fe4.3Si16.4B9 비정질 합금분말의 성형에 관한 연구
나형용,박현식,신관수부 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.9
Consolidation of amorphous Fe_(80.5)Si_(6.5)B_(12)C₁ and Co_(70.3)Fe_(4.3)Si_(16.4)B_9 alloy powders was performed by the powder rolling process. As the basic idea of this process, the decrease of viscosity of amorphous metal with increasing temperature was used. Thus the optimum heat treatment temperature(Top) for consolidation was investigated. The Top(Fe system : 738K, Co system 763 K) coincided with 95% of the crystallization temperature(Tx) measured by differential scanning calorimetry at a heating rate of 20 K/min. The consolidated amorphous alloy maintained the low coercivity of the initial powder. A ball-milling treatment of amorphous powder far consolidation improved the compressive strength of the bulk specimen by 10㎏/㎟.
기계적 합금화에 의한 FeSi 금속간 화합물의 형성에 관한 연구
나형용,박현식,신관수부 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.10
The free energy of liquid phase of Fe-Si system using sub-regular Model was calculated. It was shown that the free enegy of mixture of pure elements was greater than that of an amorphous phase and the intermetallic FeSi compound. Thus it was estimated that an amorphous phase and the intermetallic compound could be produced by mechanical alloying. Mechanical alloying was carried out on the composition of Fe_(50)Si_(50). The alloying process was investigated by X-ray diffraction and differential scanning calorimetry(DSC). During mechanical alloying, the existence of an amorphous phase was not observed. However, the intermetallic FeSi compound phase was clearly observed.
기계적 합금에 의한 Fe (1-x) Bx 계의 비정질화
나형용,박현식,신관수부 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.8
Mechanical alloying in the Fe(1-x)Bx system was performed by ball-Milling. The Mechanically alloyed powders were investigated by X-ray diffraction, differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM). In case of Fe(1-x)Bx (x=0.2) specimen, the broad peak of x-ray diffraction and the exothermic peak of DSC indicated the characteristic behavior of amorphous alloy. However, TEM observation revealed the existence of fine bcc Fe phase. On the other hand, the boride of Fe₂B or FeB was formed by mechanical alloying in Fe(1-x) Bx (x>0.3) specimens.