2009•Cailiao rechuli xuebaoRequires access
Heat treatment process of Al-Zn-Mg-Cu alloy fabricated by powder hot extrusion technology
Guanghui Min
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Abstract
The effects of solution treatment and aging process on microstructure and mechanical properties of powder hot extruded Al-Zn-Mg-Cu alloy were investigated by X-ray diffractometer,optical and transmission electron microscope,microhardness and tensile tests.The result shows that a large number of MgZn_2 particles were precipitated from Al matrix during extrusion.The optimal T6 treatment process of the alloy is 460℃×2.5h+120℃×24h.Tensile strength,yield strength and elongation of the T6 treated alloy are 731MPa,670MPa and 6.2%,respectively.The reason that the microstructure of T6 treated alloy is similar to that of cast and then extruded Al-Zn-Mg-Cu alloy after retrogression and reaging(RRA) is mainly attributed to grain refinement.