摘要
采用常温拉伸性能测试、显微硬度计、扫描电镜(能谱)、EBSD等分析手段研究了Er对Al-Mg-Si合金固溶处理后织构和性能的影响并解释了Er的作用机制。结果表明:经540℃/30 min固溶处理后合金的显微硬度达到最大值,随着Er含量的增加,合金的抗拉强度、屈服强度均增加,而延伸率则随着Er含量的增加而降低。合金中的未溶金属间化合物主要含Mn,Er两种合金元素;当Er的添加量为0.2%时,由于加入Er形成的金属间化合物对合金具有抑制再结晶的作用,合金具有Brass织构的特征;当Er的加入量为0.4%时,可作为再结晶形核核心的位置增多,合金的形变织构减弱。
Effect of Er content on the microstructure, texture and mechanical properties of Al-Mg-Si-Mn alloys at solid solution state was investigated by tensile testing at room temperature, micro-hardness test, SEM/EDS and EBSD analysis; the mechanism of effect of Er was also explained. The experimental results showed that solid solution strengthening treatment at 540 ℃ for 30min could obtain the highest micro-hardness and the tensile strength. Yield strength could be enhanced and the elongation decreased with the increasing of Er content. Mn and Er were included in the intermetallic compounds that were not solid solution treated. As to the alloy with 0.2% Er, which inhibited recrystallization process by intermetallic compounds containing Er, its texture was Brass structure; and for the alloy with 0.4% Er, which could be as the nucleation sites for the recrystallization, the texture of the deformation state was weakened.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2008年第4期455-460,共6页
Journal of the Chinese Society of Rare Earths
基金
国家杰出青年科学基金(50525413)
北京工业大学博士启动基金(52009011200705)
北京市留学回国人员基金(38009011200701)资助项目
