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Microstructure of Al-Li alloy electron beam welding joint after post-weld heat treatment

机译：焊接后热处理后Al-Li合金电子束焊接接头的微观结构

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Heat treatment was carried out to the 1420 Al-Li alloy electron beam welding (EBW) joints after welding, and the microstructures of welded joints are analyzed systematically before and after post-weld heat treatment (PWHT). The observation of joint microstructure demonstrates that the grain morphology of weldment changes from equiaxed dendrites in as-welded (AW) condition into equiaxed grains after PWHT, and that the fine strengthening phases precipitate within the grain. The XRD analysis of phase constituent and TEM observation of weldment indicate that the main strengthening phases in 1420 Al-Li alloy weldment are spheroidal δ'(Al_3Li), β'(Al_3Zr) and rod-like T(Al_2MgLi) after PWHT. Furthermore, the δ' phase precipitate free zone (PFZ) is found along the grain boundary. The scanning observation of joint fracture shows that Al-Li alloy EBW joint presents the characteristic of transgranular ductile fracture in AW condition. After PWHT, the Al-Li alloy welded joint presents the pattern of intergranular fracture. The variation of fracture mode is related to dispersed precipitation of δ' phase and the formation of PFZ at the grain boundary in weldment after heat treatment.
机译：热处理进行到1420 Al-Li合金的电子束焊接后焊接（EBW）接头，并且焊接接头的微结构之前和焊后热处理（PWHT）之后系统地分析。接头显微组织的观察表明，从等轴枝晶在作为焊接（AW）条件PWHT焊件后变成等轴晶粒的晶粒形貌，并且所述细强化相晶粒内析出。相组分和焊件的TEM观察的X射线衍射分析表明，在1420 Al-Li合金的主要强化相焊件是球形δPWHT后“（Al_3Li），β”（Al_3Zr）和棒状T（Al_2MgLi）。此外，δ”相无析出带（PFZ）沿着晶界中发现。的关节骨折示出了扫描观察到Al-Li合金EBW关节礼物穿延性断裂在AW条件的特性。 PWHT之后，Al-Li合金焊接接头呈现晶间断裂的模式。的断裂模式的变化与δ”相的分散的沉淀和PFZ的在晶界中的焊接件热处理之后形成。

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