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신현호,김철수,김창욱,장순남,성완,장동환,강석원,최석홍,Shin, Hyun-Ho,Kim, Chool-Soo,Kim, Chang-Wook,Chang, Soon-Nam,Sung, Wan,Chang, Dong-Hwan,Kang, Suk-Won,Choi, Suk-Hong 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.1
Mullitization in a multicomponent oxide system(alumina-kaolin-quartz-feldspar-talc) was studied as a function of sintering temperature from 1200 to 1500$^{\circ}C$ based upon a quantitative X-ray diffraction analysis. In the present study mullite grew as wiskers and its formation reaction showed characteristic there stages as follows In the first stage(1255-1295$^{\circ}C$) an appreciable mullitization(nucleation) occurred while corun-dum dissolution into glass (increasing glass content ) limited the rate of the reaction. At 1295-1335$^{\circ}C$ (second state) the reaction was significantly enhanced with a considerable glass consumption and with no appreciable change in corundum content. Finally (above 1335$^{\circ}C$) the reaction rate was attenuated re-markably with an apparent decrease in glass consumption rate. The impingement of mullite whiskers by oth-er whiskers and crystals was speculated to cause mullite growth in thickness direction with a slow growth rate resulting in the diminished reaction rate in the final stage.
다른 하중속도 조건에서 압입에 의한 벌크 금속유리의 변형거동
신형섭(Hyung-Seop Shin),장순남(Soon-Nam Chang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Metallic glasses are amorphous meta-stable solids and are now being processed in bulk form suitable for structural applications including impact. Bulk metallic glasses have many unique mechanical properties such as high yield strength and fracture toughness, good corrosion and wear resistance that distinguish them from crystalline metals and alloys. However, only a few studies could be found mentioning the dynamic response and damage of metallic glasses under impact or shock loading. In this study, we employed a small explosive detonator for the dynamic indentation on a Zr-based bulk amorphous metal in order to evaluate the damage behavior of bulk amorphous metal under impact loading. These results were compared with those of spherical indentation under quasi-static and impact loading. The interface bonded specimens were adopted to observe the appearances of subsurface damage induced during indentation under different loading conditions.
장순남,최준홍 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.10
The dynamic behavior of a tungsten heavy alloy (WHA) have been studied using an exploding bridgewire (EBW) detonator to load stress pulse onto the alloy plate. The particle velocity at the rear free surface of WHA was measured with varying the specimen thickness by a velocity interferometer system for any reflector (VISAR). Simple experimental technique has been introduced herein to obtain the Hugoniot elastic limit and spall strength of metals. The peak pressure generated by the EBW detonator has been exponentially decayed with increasing the sample thickness. The fracture behavior of WHA caused by the tensile stress pulse is similar to that due to the Charpy impact test.