1 Light Alloy Research Institute, Central South University, Changsha 410083; 2 Collaborative Innovation Center of Advanced Nonferrous Structural Materials and Manufacturing, Central South University, Changsha 410083; 3 Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083
Abstract: The effect of Mn and Zr on the anisotropy of Al-Zn-Mg-Cu alloys was investigated by means of mechanical tensile, exfoliation corrosion and intergranular corrosion testing combined with optical microscopy(OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the tiny and diffuse Al6Mn, Al3Zr precipitations appeared in the alloys after the addition of Mn and Zr, which could inhibited the recrystallization of Al-Zn-Mg-Cu-Ti alloys and contri-buted to the increase of grain aspect ratio in the alloy. Therefore, the mechanical properties and the abilities of resistance to intergra-nular corrosion, exfoliation corrosion were improved, but the anisotropy of alloys was increased. Moreover, the results revealed that the effect of Zr on anisotropy of microstructure and properties in the alloy was significantly larger than that of Mn.
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2018, Vol. 32 
