Inprovement of mechanicahl properties of Al-Li-Zr alloys due to the promoted formation of composite precipitates by using rapid solidification technology

这次调查中的塑料团组成含有或不含1 wt% Zr的铝锂合金。The Alloys快速地从单卷和双卷中提取连续的ribbons使用喷气铸造过程。these ribbons were mechanichally comminuted to fine powder and then consolidated into bulk compacts by vacuum hot pressing and hot extrusion to wires of 2.0 mm in diameter（20：<iota>extrusion tatio）。这些电线在直径上更远的是1.5毫米和1.6毫米的电线，这些规格在后面被处理;（a）退休年龄，（b）预年龄， 500 ° Cx 2 hrs，（c）单年龄， 190 ° Cx 16 hrs，（d）双年龄， 500 ° Cx 2 hrs +190 ° Cx 16 hrs，（e）双年龄，500 ° Cx 72 hrs +190 ° Cx 16 hrs.年龄处理的特异性是由传输电子显微镜进行的，以确定准生物的自然、大小和分布。它发现了双重老化对复合前体的形成非常有效的作用，因为它是<delta>'Al_3Li环绕<alpha>'-Al_3Zr '的连续范围。目前的调查表明，该增强的机械性质已被大量地获得了复合物的预防措施。

The composition of the plloys in this investigation are Al-Li alloys containing 4 Wt% Li with or without 1 wt% Zr. The alloys rapidly quenched from the melt into continuous ribbons using jet casting process by single and twin rolls. these ribbons were mechanichally comminuted to fine powder and then consolidated into bulk compacts by vacuum hot pressing and hot extrusion to wires of 2.0mm in diameter(20:<iota> extrusion tatio). These wires were further drown to wires of 1.5 and 1.6mm in diameters.The were specimes were age-treated in the following;(a) as-drown,(b) pre-aged, 500゜Cx2hrs,(c) single-aged, 190゜Cx16hrs,(d) double-aged, 500゜Cx2hrs+190゜Cx16hrs,(e) doule-aged, 500゜Cx72hrs+190゜Cx16hrs.The age-treated specimens were examind by a transmission electron microscope in order to clarify the nature, size and distribution of precipitatrs. It was found that double-ageing is very effective to the formation of composite precipitates, which is a continuous envelope of <delta>'Al_3Li surrounding the <alpha>'-Al_3Zr. The present investigation has shown that the enganced mechanical properties that were obtained were mainly due to the promoted precipitaition of composite precipitete.