Mn对Al-Mg-Si-Cu铝合金结晶相的影响

Effects of Mn on constituents of Al-Mg-Si-Cu alloys

通过扫描电镜/能谱、X射线衍射以及金相分析,针对含0.3%Fe(质量分数)的Al Mg Si Cu铝合金,研究了Mn含量对其结晶相的影响。研究表明:合金在铸造过程中形成的结晶相为Al1.9CuMg4.1Si3.3,Al5(FeMn)Si,Al8(FeMn)2Si以及少量的Mg2Si;增大含Mn量,合金中AlFeMnSi型结晶相数量增多;对合金进行均匀化处理时,Al1.9CuMg4.1Si3.3相完全溶解,发生Al5(FeMn)Si向Al8(FeMn)2Si相的转变;对合金进行轧制及最终热处理后,结晶相碎化且沿轧向呈纤维状分布,但结晶相的类型不变。

By means of scanning electron microscope/energy spectrum, X-ray diffraction and metallographic analysis, the effect of Mn content on the constituents of Al-Mg-Si-Cu aluminium alloys containing 0.3%Fe (mass fraction) was studied. The results indicate that the constituents formed during cast of alloys are Al_(1.9)CuMg_(4.1)Si_(3.3), (Al_5-) (FeMn)Si, Al_8(FeMn)_2Si and a little Mg_2Si. With increment of Mn content, the number of the constituents of Al(FeMn)Si is increased. During homogenizing treatment, the Al_(1.9)CuMg_(4.1)Si_(3.3) phase dissolves completely, and the phase transformation of Al_5(FeMn)Si to Al_8(FeMn)_2Si occurs. But the morphology and distribution have not variation. After rolling and final heat treatment, the constituents are crushed and distribute in continuous lines along rolling direction. However, types of the constituents vary no longer.