摘要
以Al-6Mg-0.8Zn-0.5Mn-0.2Zr-0.2Er合金为基础,对该材料的冷轧态,温轧态,完全退火态进行从室温降到77 K时的拉伸测试和冲击性能测试。运用背散射电子衍射(EBSD),透射电镜(TEM),扫描电镜(SEM)对合金的原始组织,拉伸断口,冲击断口进行观察,研究不同温度下微观组织对材料拉伸性能及冲击性能的影响。结果表明:随着测试温度的升高,样品的抗拉强度、屈服强度及冲击韧性均逐渐降低;温轧的H114态由于位错缠结规整,亚晶界比较多等原因保持了较高的强度和冲击韧性,实现了高强高韧性能的匹配。
The tensile strength and impact properties at low temperature were investigated on A1-6Mg-0.8Zn-0.5Mn-0.2Zr-0.2Er alloy for cold rolled, warm rolled and fully annealed samples. The original microstructures, tensile fracture and impact fracture were observed using electron back-scattered diffraction （EBSD）, transmission electron microscope （TEM） and scanning electron microscope （SEM） in order to analyze the effects of microstructure on tensile property and impact properties. The results show that with the decreasing of testing temperature, the stresses are drastically increased as well as the impact properties. The warm rolled alloy with more sub-boundaries has a higher strength and impact property, which realizes the matching of high strength and toughness.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第1期162-168,共7页
Rare Metal Materials and Engineering
基金
国家重点基础研究发展计划("973"计划)(2012CB619503)
中国博士后科学基金(2014M560865)
北京市博士后基金(2015zz-34)
关键词
5xxx系铝合金
拉伸性能
冲击性能
微观组织
5xxx aluminum alloy
tensile strength
impact properties
fracture scanning
