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ECO AM30 마그네슘 합금의 인장, 고주기 피로 및 피로 균열 전파 변형 거동
김민종(M. J. Kim),김세광(S. K. Kim),임현규(H. K. Lim),박중철(J. C. Pack),이기안(K. A. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
Tensile and fatigue deformation behaviors of newly developed ECO AM30 alloy was investigated. Microstructure analysis,tensile, high cycle fatigue, fatigue crack propagation tests were conducted. In the microstructure observation, average grain size was 5.8㎛ for AM30 alloy (conventional reference material) and 2.5 ㎛ for ECO AM30 alloy. ECO alloy consisted of Mg matrix containing minute amounts of Mg17Al12, Al6Mn, Mg32(Al, Zn)49, and Al₂Ca phases. Tensile results showed that the properties of ECO AM30 alloy (T.S: 313.8MPa, Y.S: 184.3MPa, elongation: 21.3%) were superior to those of AM30 alloy (T.S: 310.2MPa, Y.S: 177.3MPa, elongation: 16.5%). High cycle fatigue limit of AM30 (set at 10<SUP>7</SUP> cycles) was 130 MPa and that of ECO AM30 alloy was 170 MPa. Result of fatigue crack propagation experiment, both alloys showed similar fatigue crack propagation rate. Better tensile and fatigue properties of ECO AM30 alloy is mainly due to the refined grains and homogeneously distributed fine strengthening particles.
ECO AZ31 마그네슘 합금의 인장, 고주기 피로 및 피로 균열 전파 변형 거동
김민종(M. J. Kim),김관영(K. Y. Kim),김세광(S. K. Kim),임현규(H. K. Lim),박중철(J. C. Pack),이기안(K. A. Lee) 한국소성가공학회 2014 한국소성가공학회 학술대회 논문집 Vol.2014 No.5
Tensile and fatigue deformation behaviors of newly developed ECO AZ31 alloy was investigated. Microstructure analysis, tensile, high cycle fatigue, fatigue crack propagation tests were conducted. In the microstructure observation, average grain size was 3.2㎛ for AZ31 alloy and 2.7㎛ for ECO AZ31 alloy. Alloys consisted of Mg matrix containing minute amounts of Mg17Al12, Al6Mn, Mg12(Al, Zn)49phases. Tensile results showed that the properties of ECO AZ31 alloy (T.S: 314.6MPa, Y.S: 188.7MPa, elongation: 20.2%) were superior to those of AZ31 alloy (T.S: 306.4MPa, Y.S: 177.6MPa, elongation: 17.7%). High cycle fatigue limit of AZ31 (set at 10<SUP>7</SUP> cycles) was 140MPa and that of ECO AZ31 alloy was 160MPa. Result of fatigue crack propagation experiment, both alloys showed similar fatigue crack propagation rate. The cause of better properties the new ECO alloy was also discussed based on the fractography observations.