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Al - Mg - Si - (Co, Ni) 알루미늄 합금의 고온 저주기 피로 변형 거동
김규식(K. S. Kim),성시영(S. Y. Sung),한범석(B. S. Han),박중철(J. C. Park),이기안(K. A. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
High temperature low cycle fatigue tests of new heat resistant aluminum alloy were conducted in this study. Al-Mg-Si-(Co, Ni) aluminum alloy consists of Al matrix, small amount of Mg2Si and (Co, Ni)3Al4 strengthening particles. Low cycle fatigue tests controlled by total strain were performed with strain ratio (R)=-1, strain rate=2x10<SUP>-3</SUP>s<SUP>-1</SUP> at 250℃. Fatigue limit of low cycle fatigue of this alloy showed plastic strain amplitue(Δεps) of 0.22% at the 10<SUP>3</SUP> cycles. This value was superior that that of conventional aluminum alloy such as A319. Results of fractographical observation showed that second phases, especially (Co, Ni)3Al4 particles, could act a strengthening role for low cycle fatigue behavior. It is also attempted to clarify the mechanism of high temperature low cycle fatigue behavior of Al-Mg-Si-(Co, Ni) alloy related with its micorstructure and energy dissipation anaysis.
김규식(K. S. Kim),이영재(Y. J. Lee),성시영(S. Y. Sung),한범석(B. S. Han),박중철(J. C. Park),이기안(K. A. Lee) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.5
Fatigue deformation behavior of new heat resistant A1 alloy was studied at elevated temperature. The results of phase analysis showed that this alloy has basic A1 matrix, small amount of eutectic Si and Mg2Si phase, particulates with of (Co, Ni)3Al4 strengthening phase. High temperature tensile tests were conducted to identify the mechanical properties. From room temperature to 250℃, yield and tensile strengths of new heat resistant aluminum alloy didn"t show significant decrease and elongations increased slightly. High cycle fatigue tests were performed with R= 0,30 Hz at 130℃ and low cycle fatigue tests with strain rate of 2×10<SUP>-3</SUP> s<SUP>-1</SUP> at 250℃ respectively. Fatigue limit of high cycle fatigue of this alloy was 120 MPa at the 10<SUP>7</SUP> cycles. At plastic strain amplitude of 0.12%, a fatigue limit was got at 10<SUP>3</SUP> cycles with low cycle fatigue regime. These values were superior than those of conventional heat resistant aluminum alloy such as A319. Results of fractographical observation showed that second phases, especially (Co, Ni)3Al4 particles, affected to fatigue behavior. It is also attempted to clarify the mechanism of fatigue deformation of new resistant aluminum alloy related with its microstructure.