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Fe-32 % Ni 합금에서 마르텐사이트의 재결정 거동
손인진,최종술 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.4
Recrystallization behavior of martensite of Fe-32%Ni alloy has been studied with hardness measurement method. Hardness vs. temperature curves at all deformation degrees consist of two steps: first step is due to reverse transformations from martensite to austenite, and second step recrystallizations of reversed austenites. Recrystallization of martensite necessarily occurs after reverse transformation from martensite to austenite, and the recrystallization temperature is decreased with increasing deformation degree. Activation energy for recrystallization is also decreased with increasing deformation degree. From the discussion of the activation energy, it is suggested that the recrystallization is controlled by nucleation process. Reverse transformation temperature (As) becomes higher as the deformation degree is increased.
손인진,도정만,윤진국,두송이 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.1
Nanopowders of Al2O3, TiO2 and MgO were fabricated by high energy ball milling. The simutaneous synthesis and sintering of nanostuctured MgAl2O4-Mg3Al4Ti3O25 composite was investigated by the pulsed current activated sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. A highly dense nanostructured MgAl2O4-Mg3Al4Ti3O25 composite was produced with the simultaneous application of 80 MPa pressure and a pulsed current of 2000A within one minute. The grain sizes and mechanical properties of MgAl2O4- Mg3Al4Ti3O25 composite sintered at 1150℃ were investigated.
손인진,곽승미 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.6
ZrO2 powders were high-energy ball milled for various durations and consolidated using the high-frequency induction heated sintering (HFIHS). The effect of milling on the sintering behavior and crystallite size ZrO2 powders were evaluated. A nanostructured dense ZrO2 compact with a relative density of up to 96% was readily obtained within 1 min. The ball milling effectively refined the crystallite structure of ZrO2 powders and facilitated the subsequent consolidation. The sinter-onset temperature was reduced appreciably by the prior milling for 10 hrs. Accordingly, the relative density of ZrO2 compact increased as the milling time increases. The microhardness and fracture toughness of sintered ZrO2 increased as the density increases.
손인진,권한중,Hyun-Su Oh 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
Commercial AlN powders were high-energy ball milled for various durations, and consolidated without a binder, using the high-frequency induction heated sintering method (HFIHS). The effect of milling on the sintering behavior, crystallite size and mechanical properties of AlN compacts were evaluated. A dense AlN compact with a relative density of up to 96% could be readily obtained within 1 min. The ball milling effectively refined the crystallite structure of AlN powders, and facilitated the subsequent densification. The sinter-onset temperature was reduced appreciably, by the prior milling for 10 h from 750°C to 600°C. Accordingly, the relative density of AlN compact increased, as the milling time increased. It is clearly demonstrated that a quick densification of AlN bulk materials to near the theoretical density could be obtained by the combination of HFIHS and the preparatory high-energy ball milling process.
Fe-32% Ni 합금에서 처녀오스테나이트와 역변태 오스테나이트의 재결정온도
손인진,최종술 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.7
Recrystallization temperatures of original austenite and reversed austenite have been investigated in Fe-32%Ni alloy. The former was formed by diffusional transformation, and the latter by diffusionless transformation, At the same levels of deformation degree, the recrystallization temperatures were higher in the original austenite than in the reversed austenite. At the same levels of hardness, however, the recrystallization temperatures were higher in the reversed austenite than those in the original austenite. This is because the cells are smaller and the walls of the cells are thicker in the original austenite than in the reversed austenite, in addition to the difference in vacancy concentration between them, at the same levees of Hardness.
Crystallization and Embrittlement of $Fe_{78}B_{13}Si_{9}$ Amorphous Alloy
손인진,Son, In-Jin Materials Research Society of Korea 1991 한국재료학회지 Vol.1 No.3
$Fe_{78}B_{13}Si_{9}$ 비정질 합금의 결정화 거동과 취성 현상을 시차열량기 시험, x-선회절시험 및 투과 전자현미경 관찰을 통해서 조사 연구하였다. 결정화는 두단계의 발열반응으로 진행되었으며, 첫번째 단계에서는 비정질로부터 B.C.C. 구조인 $\alpha$-(Fe, Si)의 수지상이 생성되었고, 두번째 단계에서는 남아있던 비정질로부터 B.C.T 구조인 $Fe_2B$가 형성되었다. 에닐링 온도에 따른 시편의 파단과 변형율은 비정질 상태인 약 $340^{\circ}C$부터 급긱히 감소하였다. Crystallization and embrittlement of $Fe_{78}B_{13}Si_{9}$ amorphous alloy was investigated by differential scanning calorimetry, X-ray diffraction and transmission electron microscopy. The crystallization comprizes two exothermic processes. In the first crystallization stage, $\alpha$-(Fe, Si) dendrites are formed from the amorphous state, and in the second crystallization, $Fe_2B$ compounds are formed. An abrupt decrease of the fracture strain of the ribbon started from amorphous started annealed at about $340^{\circ}C$
손인진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.11
SiC has a low density, high hardness, chemical stability, low thermal expansion, and high strength at high temperatures. However the low fracture toughness of SiC ceramic limits its widely industrial application. One of the most obvious methodsto improve the mechanical properties has been to add a reinforcing agent to formulate a nanostructured composite materials. In this respect, graphene was evaluated as the reinforcing agent of SiC ceramics using pulsed current activated sintering(PCAS). SiC-graphene composites were obtained within short time by PCAS under a pressure of 80 MPa. The effect ofgraphene on hardness and microstructure of SiC-Graphene composite was evaluated using FE-SEM and Vickers hardnesstester.
통전 활성 연소에 의한 ${Ti}_{5}{Si}_{3}$와 ${Ti}_{5}{Si}_{3}-{ZrO}_{2}$복합재료 합성
손인진,고인용,Son, In-Jin,Go, In-Yong 한국재료학회 1996 한국재료학회지 Vol.6 No.7
${Ti}_{5}{Si}_{3}$와 ${Ti}_{5}{Si}_{3}-{ZrO}_{2}$ 복합재료의 연소합성에 미치는 전기장의 영향에 관하여 연구하였다. 45mole% 이상 첨가한 ${Ti}_{5}{Si}_{3}-{ZrO}_{2}$ 복합재료는 전기장하에서만 연소합성할 수 있었다. ${Ti}_{5}{Si}_{3}$-45mole% ${ZrO}_{2}$와 Ti5Si3-60mole% ${ZrO}_{2}$ 복합재료는 전기장을 가하지 않은 상태에서는 불안정한 연소파가 전파되었지만 반응은 완전히 일어나지 않았다 즉, 불안정한 연소파는 시편의 중앙 부근까지 전파 된 후 멈추었다. ${Ti}_{5}{Si}_{3}$-ZrO2 복합재료의 연소파 속도는 시편에 가해준 전기장에 의해 약간 증가하였다. The influence of an electric field on the combustion synthesis of ${Ti}_{5}{Si}_{3}$-x ${ZrO}_{2)$(0 $\leq$ x $\leq$0.6)was investigated. Composite of X $\geq$0.45 can only be synthesized in the presence of an electric field. Although in the absence of an electri field the system with x = 0.45 and x=0.6 can sustain a nonsteady combustion wave, the reaction is not complete. That is, an unstable wave propagates to the middle of the sample and them becomes extinguished. Wave velocity o the ${Ti}_{5}{Si}_{3}-{ZrO}_{2}$ Composites slightly increases with the imposition of external field across the sample.
손인진,박나라 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.2
Prior to sintering, two kinds of powders were produced by milling Co3O4 and Zr as raw powder with each other’s milling method such as horizontal ball milling and high energy ball milling. The first one was mixed as Co3O4 and Zr powders during horizontal ball milling and the other milled powder was synthesized as Co and ZrO2 powders during high energy ball milling. Each of the milled powders was consolidated by the High Frequency Induction Heated Sintering method within 3 minutes under the 1 GPa pressure, respectively. The relative densities of these specimens sintered from HFIHS were measured by the Archimedes method. The crystallite sizes of Co and ZrO2 in each composite were calculated by Suryanarayana and Grant Norton’s formula. The mechanical properties of Co-ZrO2 composites consolidated by HFIHS from the horizontal ball milling method and high energy ball milling method were investigated from each surface indentation.
Pulsed Current Activated Combustion Synthesis and Consolidation of Nanostructured ReSi1.75
손인진,이병수,김병량,김수철 대한금속·재료학회 2009 ELECTRONIC MATERIALS LETTERS Vol.5 No.1
Dense nanostructured ReSi1.75 was synthesized by the pulsed current activated combustion synthesis (PCACS) method within 2 min in one step from mechanically activated powders of Re and 1.75 Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of a pulsed current and mechanical pressure. Highly dense ReSi1.75 was produced under simultaneous application of 80 MPa of pressure and a pulsed current. The average grain size and mechanical properties (hardness and fracture toughness) of the compound were investigated.