Development of High Stiffness and High Thermal Stability Aluminum Alloy Prepared from Rapidly Solidified Rebbons by Composite Forming Process

在订购高强度铝合金合金的设计条件下，特别是具有高硬度和高热稳定性。Al-8wt%Fe和Al-8wt%Fe-1wt%Zr合金，由快速固体的ribbon和SiC Whisker/铝复合材料制成，由高压挤压铸造具有特征，微观、计量和机械化。快速固体的核糖体是一个具有牙科细胞结构的超固体溶液的因素。细胞边界中的可金属相位L_6Fe的精细分散体在退火时温度高于350 ° C，结果在ribbon中排序。氧化锆的添加并不能改变微观结构，但抑制了差异的范围，然后热稳定性得到了提高。Exeusion使Ribbon对齐平行向Extrusion direction，结果在laminated结构中。在热伴侣、去萨格和热剥削期间，垃圾和热剥削的发展得到了Zirconum补充剂的支持。这是Al_3Zr光谱段对亚粒和异粒的错误以及预先抑制作用的错误。SiC Whisker/aluminum复合材料由高压力挤压铸造方法处理，在SiC Whisker和基质之间具有极大的声音接口，并且没有空洞的缺陷。在SiC Whisker/Al-Cu-Mg Al-Zn-Cu合金复合材料中，在组合状态下的硬度值非常高，并且在老化阶段仍存在。

In order to obtain alloy design conditions for high strenght aluminum alloy,especially with high stiffness and high thermal stability. Al-8wt%Fe and Al-8wt%Fe-1wt%Zr alloys prepared from rapidly solidified ribbons and SiC whisker/aluminum composites processed by high pressure squeeze casting were characterized microscopically, calorimetrically and mechanically.1. Rapidly solidified ribons are consist of super solid solution with dendritic-cell structures. Fine dispersoids of metastable phase L_6Fe in the cell bounarices become coare in annealing at temperatures high than 350゜C,resulting in sortening in ribbons. The addition of zirconium does not alter the microstructure,but suppress the coasening of dispersoids, and then the thermal stability is asstained.2. Exteusion make longirudinal direction of ribbons align parallel to extrusion direction, resulting in laminated structure. The growth of disprtsoids during hot compactiopn,de-sagging and hot extrucsion is suppessed by zirconum addition. It has the pinning errect on subgrains and dispersoids and the precpitation harcdening effect by Al_3Zr spherical pahse.3. SiC whisker/aluminum composites processed by high pressure squeeze casting merhod have extremely sound interface between SiC whiskers and matric and have no void defects. In SiC whisker/Al-Cu-Mg of Al-Zn-Cu alloy composites, the hardness value at as-quenched state is very high and it is retained until stage of over aging.