摘要
通过维式显微硬度测试、室温拉伸测试、能谱分析(EDS)、扫描电子显微分析(SEM)及高角度环形暗场像-扫描透射电子显微术(HAADF-STEM)等方法研究了V元素对2519铝合金组织及力学性能的影响。结果表明,添加1.0%的V之后,合金的时效峰值延后,峰值硬度与峰值强度均降低;合金中形成了由Al、V和Ti等组成的粗大相,它们容易破裂形成裂纹源,导致合金强度降低;HAADF-STEM研究发现晶粒内存在由Al、V、和Cu等组成的纳米析出相,大量占用了强化相θ'相所需的Cu原子,是导致强度降低的另一原因;另外,拉伸过程中较大的变形量及不均匀变形导致合金表面出现了橘皮现象。
Effect of element V on microstructure and mechanical properties of 2519 alloy was analyzed by means of micro-hardness tests,room-temperature tensile tests,energy dispersive spectrometer(EDS) analysis,scanning electron microscopy(SEM) and high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM).The results show that with the addition of 1.0% V,the time to aging peak increases,the peak hardness and strength of the alloy decrease.The main reason for strength reduction is the formation of brittle secondary phases mainly composed of V,Al and Ti,these phases generate many crack sources.Through HAADF-STEM analysis,it is found that many nano-precipitates mainly composed of Al,V and Cu exist in grains,and they consume so many Cu atoms that the number of strengthening precipitates θ' decreases.Besides,due to the large deformation and inhomogeneous deformation during tensile test,orange phenomenon occurs on the alloy surface.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第4期78-83,共6页
Transactions of Materials and Heat Treatment
基金
国家重点基础研究发展计划资助项目(2009CB623704)
国家自然科学基金资助项目(51171063
10904034)
湖南省高校科技创新团队项目
湖南省仪器创新基金(2011TT1003)
