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정영관(Young Guan Jung),김경훈(Kyoung Hoon Kim),이근진(Keun Jin Lee) 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.2
In order to study the relation between expansion of the specimen and the hydrogen absorption rate, thin palladium plates with cold rolling were used. Thin palladium plates were hydrogenated in the 0.1mol H₂SO₄ electrolyte by electrochemical method. The expansion behavior on hydrogen absorbing can be obtained by X-ray diffraction analysis and by micrometer measurement. It is noted that the expansion rate of Palladium specimens in thickness direction is larger than in length and width direction. The lattice constants increase quickly with increasing hydrogen absorbing rate up to 0.5, but above the rate they keep constant. Also the clues for plastic deformation, such as slip lines and voids, were observed in abundantly even though the plates were hydrogenated once.
Ti-Al 금속간화합물의 고온변형거동 및 라멜라조직의 결정방위 분포
박규섭(Kyu-Seop Park),강창용(Chang-Yong Kang),이근진(Keun-Jin Lee),정한식(Han-Shik Chung),정영관(Young-Guan Jung),福富洋志(Hiroshi Fukutomi) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.10
High temperature uniaxial compression tests in the alpha single phase region were carried out on the Ti-43mol%AI intermetallic compound, in order to obtain oriented lamellar microstructure. The compression deformation temperatures and strain rates are from 1573K to 1623K and 1.010?⁴/s to 5.0×10?³/s, respectively. Fully lamellar microstructure was observed after the uniaxial compression deformation in a single phase region followed by cooling to room temperature. Lamellar colony diameter depended on strain rates and test temperatures. The diameter varied between 860㎛ and 300㎛ . Stress-strain curve showed a work softening and the size of lamellar colony diameter varied depending on peak stresses. This shows the occurrence of dynamic recrystallization. Texture measurements after the uniaxial compression deformation, showed the development of fiber during dynamic recrystallization. It is seen that the area for the maximum pole density existed in 35 degrees away from the compression plane. The texture sharpens with a decrease in strain rate.