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Microstructure Analysis of Rapidly Solidified Aluminum-Transition Element Alloys

快速凝固铝过渡元素合金的显微组织分析

基本信息

批准号：
01550554
负责人：
MIURA Yasuhiro
金额：
$ 1.54万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550554/
关键词：
Rapid solidification Aluminum alloy Powder alloys X-ray analysis supersaturated solid solution metastable phase 超急冷 X線回折法超急冷法急速凝固組織急冷粉末

项目摘要

Microstructure analysis was made of rapidly solidified Al-transient element systems (Al-Cr, Al-Si, Al-Fe) by means of diffraction techniques (X-ray and electron) and microscopy (optical microscopy, scanning electron microscopy and transmission electron microscopy). Thermal stability of the as-solidified microstructure was also studied. The results are summarized as follows :(1) As-solidified microstructure of rapidly solidified Al-Cr alloys (Cr : 2-6mass%, melt-spun ribbon and atomized powders) is largely dependent on Cr content and cooling rate. Low Cr content and high cooling rate (small powder size) favor the occurrence of supersaturated solid solution, while high Cr content and low cooling rate favor the occurrence of intermetallic compounds.(2) The intermetallic phase identified for the present rapidly solidified Al-Cr alloys is rheta-Al_<13>Cr_2. The rheta-Al_<13>Cr_2 phase occur as "rod" or "spherulites" depending on Cr content and cooling rate. The spherulites often contain icosahedral quasicrystalline phase.(3) For constant Cr content, the microstructure of atomized powders which have less degrees of Cr supersaturation is more thermally stable than that of melt-spun ribbons.(4) Considerable degrees of sulute-supersaturation exists in the airatomized Al-18mass%Si and Al-8mass%Fe alloy powders. The supersaturated solid solutions begin to decompose at below 300^ﾟC for Al-Si and at 350^ﾟC for Al-Fe.(5) Computer-aided X-ray diffractometry is extremely useful technique for structure determination of rapidly solidified Al alloys.

本文用X射线衍射和电子显微镜、光学显微镜、扫描电子显微镜和透射电子显微镜对快速凝固Al-过渡元素体系（Al-Cr、Al-Si、Al-Fe）的显微组织进行了分析。还研究了凝固组织的热稳定性。（1）快速凝固Al-Cr合金（Cr：2- 6 mass %，快淬薄带和雾化粉末）的凝固组织主要取决于Cr含量和冷却速度。低Cr含量和高冷却速率（小粉末尺寸）有利于过饱和固溶体的发生，而高Cr含量和低冷却速率有利于金属间化合物的发生。(2)本快速凝固Al-Cr合金的金属间化合物相为rheta-Al_<13>Cr_2。Rheta-Al_<13>Cr_2相的形态取决于Cr含量和冷却速度。球晶通常含有二十面体准晶相。(3)在Cr含量不变的情况下，Cr过饱和度较小的雾化粉末的组织比快淬薄带的组织更稳定。(4)空气雾化Al-18mass%Si和Al-8mass%Fe合金粉末中存在一定程度的硫过饱和。过饱和固溶体开始分解，Al-Si在300 ℃以下，Al-Fe在350 ℃。(5)计算机辅助X射线衍射法是快速凝固铝合金组织测定的一种非常有用的技术。