http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Influence of Microstructures on Mechanical Properties of Al-Si-Cu-Mg Cast Alloys
Kang, Hyo Gyoung,Choi, Chang Ock,Ogi, Keisaku 동아대학교 생산기술연구소 2000 生産技術硏究所硏究論文集 Vol.5 No.1
A commercial Al-Si-Cu base alloy (JIS AC4B) and the similar compositions of pure alloys with 0 to 0.7%Fe were solidified at the cooling rate of 2.7 to 14.4K/s. Tensile tests and quantitative microstructure analysis were performed on the as cast specimens and T_6specimens. Tensile strength (бB) increased as the microstructure became finer. бB rose linearly with decreasing of secondary dendrite arm spacing(DAS) of primary α , while the modification of eutectic Si with Sr had a smaller effect. The crack propagated along dendrite arms and the fracture surface exhibited a structure whose coarseness was close to DAS. Fe-rich intermetallic compounds took the acicular and chinese script type shapes. Higher cooling rate and more Sr addition promoted the crystallization of chinese type one. The Fe-rich compounds decreased the elongation, though they tended to raise the yield strength. TEM analysis revealed that the aging process was influenced by eutectic Si and minor elements, however the these phenomena may have little influence on tensile properties.