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중력주조 AM60 마그네슘 합금의 강화 거동에 미치는 Si 및 Ca 첨가영향
김재우,김도향,신광선 ( Jae Woo Kim,Do Hyang Kim,Kwang Seon Shin ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.4
N/A Effects of Si and Ca additions on the mechanical properties of AM60 based Mg alloys have been investigated. Hardness of the AM60 based Mg alloys reached a maximum value after aging for approximately 33 hours but the amount of hardness increase was negligible. The poor age hardening response of the alloys was due to low Al content, which implies that Al content must be >6 wt.% to observe age hardening effect. The tensile and yield strength increased with increasing AI, Si, and Ca content but elongation decreased with increasing Al and Si content. The best mechanical properties obtained in AM 40-2.5Si-0.2Ca alloy after T4 heat treatment were as follows; tensile strength 193.4 MPa, yield strength 79.2 MPa, and elongation 11.2%. High temperature property obtained from creep test was also improved by introducing Mg₂Si which has high hardness, high melting temperature and low thermal expansion coefficient. (Received February 6, 1998)
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김재우,신광선,김도향,임창동 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.11
Effect of Si and Ca additions on the microstructural refinement of AM60 based Mg alloys were investigated. The microstructural characterization was performed by utilizing optical microscope, energy-dispersive spectrometer(EDS), scanning electron microscope(SEM), transmission electron microscope(TEM), differential scanning calorymeter(DSC) and Image analyser. As-cast microstructure of the alloys investigated consisted of Mg_(17)Al_(12). Mg₂Si and α-Mg matrix. Area fraction of Mg_(17)Al_(12) precipitate increased with Al content, the total amount being kept in the range of 4-7%. Continuous or discontinuous precipitation of Mg_(17)Al_(12), was dependant on the amount of Al; i.e., no continuous-type precipitation in alloys containing<2wt.% Al and no discontinuoustype precipitation in alloys containing <4wt.% Al. Two types of Mg₂Si were observed; i.e., chinese script type in alloys containing < 2wt.% Si and polygon type in alloys containing >2wt.% Si. The morphology of Mg₂Si was also depentent on the Al amount; e.g. only chinese script type was observed in alloys containing less than 2wt.% of A1 even though enough Si amount was present for polygon type Mg₂Si. The total amount of Mg₂Si in as-cast alloys was approximately 7%, and kept constant even after heat treatment. The grain size of Si containing alloys was refined by the presence of two types of Mg₂Si: e.g. 237㎛ in AM60 and 125㎛ in AM60-1Si-0.2Ca after aging. Addition of Ca refined the distribution of Mg₂Si by providing heterogeneous nucleation sites for Mg₂Si.
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