Zhang Zhongke, Che Yun, Men Sanquan, et al. Aging Precipitates in Al-Cu-Mn High Strength Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2014,34(10):1114-1116.
Zhang Zhongke, Che Yun, Men Sanquan, et al. Aging Precipitates in Al-Cu-Mn High Strength Aluminum Alloy[J]. Special Casting & Nonferrous Alloys, 2014,34(10):1114-1116. DOI: 10.15980/j.tzzz.2014.10.032.
Al-Cu-Mn高强铝合金的时效析出相
摘要
利用金相显微镜、透射电镜(TEM)、扫描电镜(SEM)、电子衍射分析技术和能谱(EDS)等方法
对Al-Cu-Mn高强铝合金微观结构进行了观察分析。结果发现
合金沉淀相以θ′相为主并有弥散分布的θ相;晶内细小的弥散小质点为TAl12Mn2Cu相
起到弥散强化作用;还存在尺寸在2nm左右的球状颗粒Cd相
它的存在促进了强化相的形核和生长。组织主要由晶粒尺寸为30
8
0μm的等轴晶构成。分析还发现
合金组织存在成分相偏析
稀土等合金化元素主要偏聚在晶界上。合金有一定宽度的晶界无沉淀析出带(PFZ)
晶界上有细小的沉淀物析出
是μm级的针状N相
使其伸长率降低
因此应尽量减少这些脆性相的数量。
Abstract
Microstructure of a new Al-Cu-Mn high strength aluminum alloy was investigated by metallurgical microscope
transmission electron microscope(TEM)
scanning electron microscopy(SEM)
electron diffraction and energy spectrum(EDS)
XRD(X-ray diffraction).The results reveal thatθ′precipitate phase is dominant in the alloy with someθdisperoids.The dispersedly fine T-Al12Mn2 Cu phase can be observed in the microstructure
playing a role in dispersed strengthening.In addition
Cd particle with approximately 2nm in size can be observed in the matrix phase to promote the nucleation and growth of strengthening phase.Microstructure of the alloy is composed of equaixed crystal with 30
8
0μm
meanwhile
texture is absent apparently.EDS analysis reveals that there exists composition segregation
and RE element is mainly segregated at the grain boundary.PFZ zone can be observed in the alloy
and fine needle N phase withμm level in size is precipitated from the grain boundary
which can decrease the elongation of the alloy.So the quantity of the brittle phase should be decreased as possible.
关键词
高强铝合金时效析出相性能
Keywords
High Strength Aluminum AlloyAging PrecipitatesProperties