EFFECT OF SCANDIUM ON THE DECOMPOSITION OF ALUMINUM ZINC-ALLOYS

被引：3
|
作者：
DUTKIEWICZ, J [1 ]
ZAHRA, AM [1 ]
ZAHRA, CY [1 ]
机构：
[1] CNRS,CTR THERMODYNAM & MICROCALORIEMETRIE,F-13003 MARSEILLE,FRANCE
来源：
JOURNAL OF MATERIALS SCIENCE | 1992年 / 27卷 / 11期
关键词：
D O I：
10.1007/BF01154115
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of scandium on the hardness, structure and heat evolution of an aluminium-40% zinc alloy was investigated. It was found that contrary to its action in other aluminium-based alloys, scandium does not raise the maximum hardness during an ageing treatment. This may be explained by insufficient scandium redissolution at the rather low temperature necessary for achieving a solid solution of zinc in aluminium. Differential scanning calorimetry studies show a similar heat evolution in both alloys upon linear heating, starting with the reversion of modulated structures. An exothermal effect appears only in the scandium-bearing alloy due to increased heterogeneous precipitation of alpha(r)' and beta on Al3Sc particles. Above 200-degrees-C, the dissolution of the alpha(r)' and beta phases starts, followed by the monotectoid reaction.
引用
收藏
页码：3032 / 3035
页数：4
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