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采用扫描电镜、EBSD、透射电镜等方法研究了Al - Zn - Mg - Cu合金电子束焊接接头的微观组织特点,并分析了焊缝基体与熔合区在热处理前后织构的变化.结果表明,接头熔合区由尺寸约3~8 μm的等轴细晶组成,析出相沿晶界均匀分布,经T6处理后熔合区的晶粒尺寸无明显变化,晶界变细,沿晶界分布的连续析出相溶解,残余孤立的MgZn2析出相,尺寸约1~2 μm.基体主要织构为<111>和<001>丝织构,经T6(固溶时效)处理后,两种织构的含量无明显变化,织构强度略有下降,焊缝熔合区无明显的织构. 相似文献
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In-situ study of precipitates in Al–Zn–Mg–Cu alloys using anomalous small-angle x-ray scattering 下载免费PDF全文
In the present work,the precipitate compositions and precipitate amounts of these elements(including the size distribution,volume fraction,and inter-precipitate distance) on the Cu-containing 7000 series aluminum alloys(7150 and 7085 Al alloys),are investigated by anomalous small-angle x-ray scattering(ASAXS) at various energies.The scattering intensity of 7150 alloy with T6 aging treatment decreases as the incident x-ray energy approaches the Zn absorption edge from the lower energy side,while scattering intensity does not show a noticeable energy dependence near the Cu absorption edge.Similar results are observed in the 7085 alloy in an aging process(120℃) by employing in-situ ASAXS measurements,indicating that the precipitate compositions should include Zn element and should not be strongly related to Cu element at the early stage after 10 min.In the aging process,the precipitate particles with an initial average size of ~ 8 ?A increase with aging time at an energy of 9.60 ke V,while the increase with a slower rate is observed at an energy of 9.65 ke V as near the Zn absorption edge. 相似文献
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