2519A铝合金时效析出相的TEM分析  

Observation of Precipitation Phase in Thermo-mechanical Ageing 2519A Aluminum Alloy

作　　者：王会敏[1] 夏长清[1] 雷攀[1] 王志伟[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第11期1040-1042,共3页Special Casting & Nonferrous Alloys

基　　金：国家重点基础研究发展计划(973计划)资助项目(2005CB623706)

摘　　要：采用拉伸测试、硬度测试、TEM观察等方法,研究了预形变对2519A铝合金时效析出相的影响。结果表明,与未经预变形状态的相比,经过50%预变形后,由于预变形增加了合金中的位错密度,使晶内析出相细小弥散分布,同时减少了晶界析出相的数量,减少了其占晶界和亚晶界的体积分数,从而改善了合金的性能。拉伸试验结果表明,50%预形变显著改善了合金的力学性能。Effects of pre-aging deformation on precipitation phase in the 2519A aluminum alloy were investigated by TEM(transmission electron microscope),tensile testing and micro-hardness measurement.The results reveal that,compared with those of un-preaged deformed alloy,the mechanical properties of 50% cold rolled alloy are greatly improved,which are attributed to pre-deformation,increasing the dislocation density in the alloy resulting in the dispersive distribution of fine precipitation phase and decreasing the numbers of precipitates on the grain boundary to reduce the total volumetric fraction of precipitation free zone at grain boundary and sub-grain boundary.

关 键 词：预变形 弥散强化 力学性能 2519A铝合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]