作　　者： ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《轻合金加工技术》 2012年第9期64-69,共6页

摘　　要： 采用半连续铸造-轧制技术制备了两种Sc质量分数含量为0.25%和0.10%的Al-Mg-Mn合金薄板,研究了稳定化退火工艺对两种不同Sc含量合金板材拉伸力学性能、剥落腐蚀性能和显微组织的影响。结果表明,两种合金冷轧板材稳定化退火过程中有相同的组织、性能变化规律,即随着退火温度升高,板材强度稍有下降而塑性升高,表现出很强的抗退火软化的能力,其中低Sc含量合金拉伸性能略低于高Sc含量合金的;其次,随退火温度的升高,板材抗剥落腐蚀的能力也表现出相同规律性的变化,200℃1 h左右退火时剥落腐蚀最严重,随着退火温度升高,抗腐蚀性能提高;两种合金冷轧板材在300℃1 h稳定化退火可以获得较好的综合拉伸力学性能和腐蚀性能,在此条件下,低Sc含量的合金板材抗拉强度、屈服强度和伸长率仍然分别达到437 N/mm2、340 N/mm2和16.3%,有很好的开发应用前景。 The Al-Mg-Mn alloy strip containing 0.25% Sc and 0.10% Sc separately have been semi-continuous cast. The effect of scandium contents and stabilization annealing treatment on tensile property, exfoliation corrosion property and microstructure of the two alloys has been studied. The results show that during stabilization annealing the variation rule of microstructure and properties of these two alloy plates is the same. With increasing of annealing temperature, the strength decreases a little but the ductility being increased. This phenomenon shows that these plates possess strong soften-resistance ability. The tensile strength of alloy with lower Sc content is lower than that of alloy with higher Sc. The exfoliation corrosion resistance rule of these two alloy plates is the same while the annealing temperature being increased. The exfoliation corrosion is most serious while the plates being annealing treated at 200℃/1 h. The exfoliation corrosion resistance increases with the annealing temperature increasing. Both the tensile strength and the sheets are optimized while the sheets being corrosion resistance of the cold rolled two alloy annealed at 300℃/1 h. At this condition the tensile strength ;yield strength and elongation of Al-Mg-Sc alloy sheet with low Sc content can be as high as 437 N.mm^-2 ,340 N.mm^-2and 16.3% respectively,that shows that the alloyspossess excellent development and application prospects.

关 键 词： 合金 拉伸性能 剥落腐蚀 显微组织

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]