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CaCN2 첨가에 의한 AM60 마그네슘 합금의 결정립 미세화 및 기계적 성질
엄정필,정승규,임수근,신희택,정득수 ( Jeong Pil Eom,Seong Kyu Jeong,Su Geun Lim,Hee Taek Shin,Deuk Soo Jeong ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.4
N/A Effects of CaCN₂ addition on the grain refinement in the AM60 magnesium ingots were investigated. The effects of the CaCN₂ are estimated with different inoculation temperatures, inoculation contents, and holding time to find out the optimum condition. AM60 alloy was melted in the low carbon steel crucible by cylindrical electric furnace under an argon atmosphere. The melting and casting apparatus is specially designed for magnesium alloys. The grain size of AM60 magnesium alloy decreased significantly with an increase in CaCN₂ content and, at 0.8 wt% CaCN₂ or more, grain size becomes constant at about 85 ㎛. The optimum condition was obtained in the 0.8 wt% CaCN₂ for holding molten metal of 30 min. at the temperature of 710˚C. The tensile properties of AM60 magnesium alloys were improved due to grain refinement by addition of CaCN₂. In the optimum condition, the yield strength, tensile strength and elongation were σ_(0.2)= 107 MPa, σ_(T.S)=234 MPa and e=14.2%. The variation of stress with strain obeyed the relationship of the σ= Kε^n. The strain-hardening exponent, n and strength coefficient, K obtained in the 0.8 wt% CaCN₂ added AM 60 magnesium alloy were n=0.21 and K=390 MPa. (Received May 28, 1998)
Mg-Zn-(Mn)-Ca 합금의 미세조직 및 기계적 성질
엄정필,차동득,임수근,허보영 ( Jeong Pil Eom,Dong Deuk Cha,Su Guen Lim,Bo Young Hur ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.6
N/A The microstructure and tensile properties of Mg-Zn-Ca and Mg-Zn-Mn-Ca alloys have been investigated. The alloys were obtained by melting in a low carbon crucible coated with boron nitride under an Ar gas atmosphere to prevent oxidation and combustion. The Mg alloy melt was cast into the metallic mold at room temperature, and cooling part was located at the bottom of mold. The phase formed during solidification of the Mg-Zn-(Mn) alloys containing 0.5%Ca is Ca₂Mg_6Zn₃,. The yield strength and ultimate tensile strength of the alloys increased with increasing Zn content, but the ductility did not change with increasing Zn content. The addition of Mn improves the yield strength and ultimate tensile strength of the alloys, but the ductility did not change. Tensile fracture of the alloys revealed brittle failure, with cracking along the Ca₂Mg_6Zn₃, phase. The variation of stress with strain obeyed the relationship of the σ=Kε. (Received October 21, 1997)
Ar 가스 분위기에서 제조한 Mg-Zn-(Mn) 합금의 미세조직
엄정필,임수근,허보영 ( Jeong Pil Eom,Su Guen Lim,Bo Young Hur ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.4
N/A The microstructure of Mg-1∼6wt%Zn, Mg-1.5wt%Mn and Mg-3,6wt%Zn-lwt%Mn alloys were investigated by means of optical microscopy, scanning electron microscopy and energy dispersive spectroscopy. The liquid Mg alloys were tasted into the metallic mold at room temperature, and cooling part was located at the bottom of mold. The microstructure of Mg-Zn cast alloys revealed that MgZn compounds were around the secondary dendrite arms. Scanning electron microscopy and energy dispersive spectroscopy showed that the composition of MgZn compound was Mg-77wt%Zn. The addition of Mn in Mg-Zn alloys refined the grain size in as tasted alloys. Manganese additions also increased the Vickers hardness.