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Ni-Al 계 마르텐사이트 합금에서 Llo → Ni5Al3 변태
지광구(K. K. Jee),송시연(S. Y. Song),장우양(W. Y. Jang) 한국열처리공학회 2002 熱處理工學會誌 Vol.15 No.2
N/A LI_0 → Ni_5Al_3 reordering and related properties in Ni-Al alloys consisting of 64-65at%Ni are characterized by X-ray diffraction, shape memory effect and damping capacity. Formation of Ni_5Al_3 takes place by simple ordering of atoms with a continuous increase in c/a ratio. As a result, degradation of shape memory effect and damping capacity is observed after short time annealing at 200-300℃.
Fe-Mn계 합금에서 응력유기 ε 마르텐사이트의 양에 미치는 열처리 온도의 영향
지광구 ( K. K. Jee ),한주현 ( J. H. Han ),장우양 ( W. Y. Jang ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.6
N/A In this work, a new method of measuring volume fraction of deformation-induced ε martensite is pro-posed using endothermic heat on reverse transformation. As grain size increases, the amount of ε martensite forming on cooling increases. However, with a decrease in grain size, more ε is induced by deformation, improving shape memory effect.
Fe-18wt%Mn 마르텐사이트 합금에서 주조상태와 열처리한 상태의 기계적 성질과 진동감쇠능에 관한 연구
백승한,김정철,지광구,신명철,최종술 ( S . H . Baik,J . C . Kim,K . K . Jee,M . C . Shin,C . S . Choi ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.3
In recent work, we reported that a hot-rolled Fe-18wt%Mn alloy exhibited high damping capacity as well as excellent mechanical properties. It was also proposed that damping capacity of the alloy was proportional to the γ/ε boundary area. In the present study, the effects of homogenization(12hrs at 1100℃) and solution treatment(1hr at 1050℃ before air cooling) on damping capacity and mechanical properties were investigated for as-cast and heat treated Fe-18wt%Mn alloy. The specimen subjected to both homogenization and solution treatment was found to show superior damping capacity and mechanical properties to the as-cast state due to removal of segregation and increase in γ/ε boundary area.
Fe-17wt%Mn 합금의 진동감쇠능 , 내후성 및 기계적 성질에 미치는 Cu 첨가의 영향
백승환,김정철,지광구,최종술 ( S . H . Baik,J . C . Kim,K . K . Jee,C . S . Choi ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
We have reported that an Fe-17wt%Mn alloy exhibits the highest damping capacity in the Fe-Mn binary system. In the present work, the effects of copper content on the damping capacity, atmospheric corrosion and mechanical properties were studied. The damping capacities were measured at room temperature for the air cooled Fe-17wt%Mn alloy having copper content from 0.1wt% to 1.1wt%. The damping capacity of the Fe-17wt%Mn alloy was decreased with increasing copper content. However, the addition of Copper was found to improve mechanical properties and atmospheric corrosion resistance. These mechanical properties were attributed to the formation of stress-induced martensite during tensile test.
Fe - X%Mn - 5Cr - 5Co - 4Si 합금 리본의 변태특성 및 형상기억능에 미치는 열처리 영향
강후원(H . W . Kang),지광구(K . K . Jee),장우양(W . Y . Jang),강조원(J . W . Kang) 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.3
N/A The change of ribbon geometry, microstructure and shape recovery with Mn contents, wheel speed and various annealing temperature have been studied in Fe-X%Mn-5Cr-5Co-4Si(X%=15, 20, 24) shape memory alloy (SMA) ribbons rapidly solidfied by single roll chill-block melt-spinning process. The thickness and width of melt-spun ribbons are reduced, results in refining and uniformalizing grains with increasing wheel speed. In the ribbons melt-spun at a wheel speed of 15m/sec, both a and α`martensites are formed in ribbon 1 (15.5wt%Mn), while only ε martensite is revealed in ribbon 2 (20.2wt%Mn) and ribbon 3 (23.5wt%Mn). The volume fraction of a martensite is decreased with increasing Mn contents, and those of ε as well α`martensites are increased due to thermal stress relief and grain growth with increasing annealing temperature. Mn temperatures of the ribbons 1, 2 and 3 are fallen with increasing Mn contents. M_s temperatures of the ribbons 1, 2 and 3 annealed at 300℃ for 3min are risen abruptly, but are nearly constant even at higher annealing temperature, i.e., 400, 500 and 600℃ for 3 min. Shape recovery of the ribbons 1, 2 and 3 increased 30%, 52% and 69% with Mn contents, respectively. Shape recovery of ribbon 1 (15.5wt%Mn) formed ε and α`martensites decreased because of the presence of α`martensite but those of ribbon 2 (20.2wt%Mn) and ribbon 3 (23.5wt%Mn) formed ε martensite increased with increasing annealing temperature.