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CrW 전율고용체 첨가 내열 알루미늄 합금에 관한 연구
김진평 ( Jin Pyeong Kim ),성시영 ( Si Young Sung ),한범석 ( Beom Suck Han ),김상호 ( Sang Ho Kim ) 한국주조공학회 2013 한국주조공학회지 Vol.33 No.3
Recently, heat-resistant aluminum alloy has been re-focused as a downsizing materials for the internal combustion engines. Heatresistant Al alloy development and many researches are still ongoing for the purpose of improving thermal stability, high-temperature mechanical strength and fatigue properties. The conventional principle of heat-resistant Al alloy is the precipitation of intermetallic compounds by adding a variety of elements is generally used to improve the mechanical properties of Al alloys. Heat resistant aluminum alloys have been produced by CrW homogeneous solid solution to overcome the limit of conventional heat resistant aluminum alloy. From EPMA, it is found that CrW homogeneous soild solution phases with the size of 50-100 μm have been dispersed uniformly, and there is no reaction between aluminum and CrW alloy. In addition, after maintaining at high temperature of 573 K, there is no growth of hardening phase, nor desolved, but CrW still exists as a homogeneous solid solution.
알루미늄/발포알루미늄의 질소 플라즈마 표면처리에 따른 파괴인성평가
정협재(Hyup Jae Chung),이경엽(Kyong Yop Rhee),한범석(Beom Suck Han),유용문(Yong Mun Ryu) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.8
Aluminum foam material has unique properties that make them useful in applications to the automobile, construction and railroad industries. In this study, aluminum was plasma-treated using nitrogen gas to improve fracture behavior between aluminum and aluminum foam material. SLS specimens were used for fracture tests. They were performed using plasma-treated and untreated aluminum/aluminum foam specimens. It was shown that the fracture strength and the fracture toughness of aluminum/aluminum foam were improved ~86% and ~250%, respectively when the aluminum was plasma-treated using nitrogen gas.