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HERO ID
4268771
Reference Type
Journal Article
Title
Microstructure of spray formed Al-Zn-Mg-Cu alloy with Mn addition
Author(s)
Cai Yuan-hua; Liang Rui-guang; Su Zhan-pei; Zhang Ji-shan
Year
2011
Is Peer Reviewed?
1
Journal
Transactions of Nonferrous Metals Society of China
ISSN:
1003-6326
Volume
21
Issue
1
Page Numbers
9-14
DOI
10.1016/S1003-6326(11)60671-7
Web of Science Id
WOS:000286980300002
Abstract
With the aim to improve the strength of Al-Zn-Mg-Cu alloy, the alloy billet containing Mn was produced by spray forming method, and the microstructural features were investigated using X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that the billet mainly consists of fine equiaxial grains of MgZn(2) and Al(6)Mn with size ranging from 5 mu m to 25 mu m. Nano-scaled MgZn(2) is dispersed in the as-sprayed alloy, primary Al(6)Mn particles are precipitated at grain boundaries with an average size of 5 mu m. A few CuAl(2), Al(3)Zr and eutectic are also found in as-sprayed Al alloy. The volume fraction of the porosity is about 12%. DSC result indicates that most of the solutes are precipitated during spray forming process, and no obviously thermal effects occur below 450 degrees C. Both matrix grains and Al(6)Mn particles grow monotonously with the increase of annealing temperature, but the growth rate of Al(6)Mn particles is markedly lower than that of Al grains, and the matrix grains grow rapidly when the annealing temperature is above 375 degrees C.
Keywords
Al-Zn-Mg-Cu alloy; spray forming; manganese; microstructure
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