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Characterization of Precipitation in Al-Zn-Mg-Cuand Li Containing Al-Zn-Mg-Cu Alloys after Isothermal Aging

机译:等温时效后Al-Zn-Mg-Cu合金中Al-Zn-Mg-Cu和Li的析出特征

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The evolution of microstructure, precipitate size, volume fraction and integrated intensity of Al-8.0Zn-2.05Mg-1.76Cu (7055) and 7055-1.0Li alloys during isothermal ageing has been studied by transmission electron microscopy (TEM) and synchrotron-radiation small angle X-ray scattering (SAXS). According to the TEM results, referring to the thermodynamic phase diagram, it was found that the addition of Li changed the types of the precipitates. T_1 phase was observed in the 7055-1.0Li alloy besides the GP zones, η' and η with variant orientations with matrix, η_1, η_2 and η_4. The super-lattice spots of Ll_2 (Cu_3Au) structure were probably due to the existence of Al_3Ll(δ') or Al_3(Zr,Li). Furthermore, the precipitation sequence has been modified in Li-containing Al-Zn-Mg-Cu alloys. The precipitate volume fraction derived from the integrated intensity for 7055 alloy reached an plateau except ageing at 120°C and the maximum was about 0.052-0.054 in the temperature range 140-160°C.
机译:通过透射电子显微镜(TEM)和同步辐射研究了Al-8.0Zn-2.05Mg-1.76Cu(7055)和7055-1.0Li合金在等温时效时的微观结构,析出物尺寸,体积分数和集成强度的变化。小角度X射线散射(SAXS)。根据TEM结果,参考热力学相图,发现Li的添加改变了沉淀物的类型。在7055-1.0Li合金中,除了GP区域η'和η与基体η_1,η_2和η_4具有不同的取向外,还观察到T_1相。 Ll_2(Cu_3Au)结构的超晶格点可能是由于Al_3Ll(δ')或Al_3(Zr,Li)的存在。此外,在含锂的Al-Zn-Mg-Cu合金中,沉淀顺序得到了修改。从7055合金的积分强度得出的析出物体积分数达到了平稳,除了在120°C时效,在140-160°C的温度范围内最大值约为0.052-0.054。

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