발간논문

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Vol.37, No.9, 1041 ~ 1048, 1999
Title
Fatigue Properties of Al - Mg Alloy Sheets for Auto - body Application
김형욱Hyoung Wook Kim,강석봉Suk Bong Kang,강혁Hyuk Kang,남기우Ki Woo Nam
Abstract
The effect of Mg content on fatigue behavior in Al-Mg alloys for auto body applications was investigated in this study. The increase of Mg content in Al-5.5 wt% Mg and Al-6.6 wt% Mg alloys enhanced the tensile strength and elongation from 284 ㎫ and 26.4% to 321 ㎫ and 31.2%. But the Al-6.6 wt% Mg alloy showed lower fatigue strength compared to that of Al-5.5 wt% Mg alloy due to the small precipitates along grain boundaries. These small precipitates were identified as Al_8Mg_5 phase which plays an important role as fatigue crack initiation site. The fatigue limits of Al-5.5 wt% Mg and Al-6.6 wt% Mg alloys showed 0.56 and 0.44, respectively. The fatigue crack growth rate of Al-6.6 wt% Mg alloy sheets is faster than that of Al-5.5 wt% Mg alloy sheets.
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