| Title |
Pesearch Paper / Mechanical Behaviors : Mechanical Property and Precipitation Behavior in Al - Mg - Si - Cr - Be - ( Mn ) Alloys for Auto Body Meaterials |
| Authors |
우기도(Kee Do Woo),나홍석(Hong Seok Na),문호정(Ho Jung Mun),황인오(In O Hwang) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Al-Mg-Si base alloys have a good strength, formability, corrosion resistance and bake hardenability. But the bake hardenability of Al-Mg-Si-Cr-Be alloy is better than that of Al-Mg-Si alloy. Mn is added to improve the toughness in Al-Mg-Si alloys. But the precipitation behavior of Al-Mg-Si based alloys with large amount of Mn addition($gt;0.5 wt%) has not been reported yet. Therefore, the mechanical property and precipitation behavior of the Al-Mg-Si-Cr-Be alloy with 0.5-1.5%Mn was observed using the hardness and tensile tests, differential scanning calorimetry(DSC) and transmission electron microscope(TEM). The tensile strength of Al-Mg-Si-Cr-Be alloy increased with the increase of Mn content without decrease of elongation due to the increase of Mn dispersoid. Therefore, the combination of properties such as strength and ductility in the Al-Mg-Si-Cr-Be-Mn alloy was better than that in the Al-Mg-Si-Cr-Be alloy. The formation energy of β$quot; phase of Al-Mg-Si-Cr-Be alloy is decreased by the addition of Mn. But The precipitation of β` phase of Al-Mg-Si-Cr-Be alloy is little affected by the addition of Mn. |