| 학회 |
한국재료학회 |
| 학술대회 |
2007년 가을 (11/02 ~ 11/02, 성균관대학교) |
| 권호 |
13권 2호 |
| 발표분야 |
전자재료 |
| 제목 |
Synthesis of Supersaturated Solid Solution in Immiscible Cu-Nb System by Mechanical Alloying |
| 초록 |
Mechanical alloying(MA) by high energy ball mill of pure Cu and Nb powders was carried out under the Ar gas atmosphere. We have revealed that the supersaturated solid solution can be produced in the range up to CuxNb100-x (x=5-30) by MA for 120 hrs, as demonstrated by X-ray diffraction, DSC analysis and by the electronic studies through a change in the superconducting transition in the low-temperature specific heat. The Cu30Nb70 samples ball-milled for 120 hrs exhibit only a broad exothermic heat release. The total energy, ΔHt accumulated during MA for the mixture of Cu30Nb70 powders increased with milling time and approached the saturation value of 7.5 kJ/mol after 120 h of milling. It can be seen that the free energy difference between supersaturated solid solution and Cu30Nb70 powders is estimated to be 7 kJ/mol by Miedema et al. Hence it is thermodynamically possible to assume the formation of a supersaturated solid solution phase in this system. |
| 저자 |
Jong-Hun Seo and Chung Hyo Lee |
| 소속 |
Department of Advanced Materials Science and Engineering |
| 키워드 |
mechanical alloying; immiscible Cu-Nb system; supersaturated solid solution; total enthalpy; superconducting transition
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| E-Mail |
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