|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Fatigue and Corrosion Properties of Mg-Al-Mn Alloy by Super Vacuum Die Cast
||Wei Wen, Alan A. Luo, Tongguang Zhai
|On-Site Speaker (Planned)
AM60 Mg-Al-Mn alloys fabricated by super vacuum die cast (SVDC) and high pressure die cast (HPDC) were fatigued in four-point bend at room temperature, 20 Hz and stress ratio R=0.1 in different humidity levels. It was found that the SVDC alloy had much higher fatigue strength than the HPDC alloy. Crack initiation was predominantly associated with surface inverse macro-segregation and pore clusters. The surface layer with less pore density and smaller pores in the SVDC alloy accounted for its improved fatigue strength over that of the HPDC alloy. The effect of such skin layer on fatigue properties and corrosion resistance were investigated by comparative experiments using the as cast sample and the sample with skin layer removed. The polarization curves of SVDC sample (both as cast and skin layer removed) and HPDC sample were measured in corrosion test to study the effect of SVDC method on corrosion resistance of Mg-alloy.
||Definite: A CD-only volume