Ageing Behavior of Mullite/Al-Mg-Si Composites and Its Matrix Alloy

Long Jianping

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Ageing Behavior of Mullite/Al-Mg-Si Composites and Its Matrix Alloy
Issue 4, Pages: 17-20(2004)
Published： 2004 ，
DOI：

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[1]龙剑平,,,,,,,,,张先菊,,,,,,,,,李伟,,,,,,,,,沈保罗,,,,,,,,,涂铭旌.Mullite/Al-Mg-Si复合材料时效行为研究[J].特种铸造及有色合金,2004(04):17-20+77-78.

Long Jianping. Ageing Behavior of Mullite/Al-Mg-Si Composites and Its Matrix Alloy. [J]. Special Casting & Nonferrous Alloys (4):17-20(2004)
[1]龙剑平,,,,,,,,,张先菊,,,,,,,,,李伟,,,,,,,,,沈保罗,,,,,,,,,涂铭旌.Mullite/Al-Mg-Si复合材料时效行为研究[J].特种铸造及有色合金,2004(04):17-20+77-78. DOI：

Long Jianping. Ageing Behavior of Mullite/Al-Mg-Si Composites and Its Matrix Alloy. [J]. Special Casting & Nonferrous Alloys (4):17-20(2004) DOI：

摘要

选用挤压铸造法制备Mullite/Al Mg Si复合材料

采用扫描电镜、透射电镜等手段

研究了莫来石短纤维增强不同镁硅比Al Mg Si复合材料及其基体合金的时效行为。结果表明 :复合材料具有和基体合金相似的时效硬化曲线

相同的析出序列 ;Mullite纤维的引入提高了基体合金的时效硬度

并一定程度地加速了基体合金的时效硬化过程

但对GP区的抑制不明显 ;Si或Mg元素的富余都加速了复合材料及其基体合金的时效硬化过程

且两类材料的时效峰明显提前。Mullite短纤维与富余的Si或Mg元素对复合材料的时效硬化过程具有交互促进作用

Abstract

The ageing behaviors of mullite short fibre reinforced Al Mg Si composites with different Mg Si ratios (Mg/Si=2.Mg/Si<2

Mg/Si> and its matrix alloy in squeezing casting were examined by means of hardness measurement （HB）

SEM

DSC and TEM.The results showed that the composites and its matrix alloy have the similar ageing hardening curves and the same precipitation procedure.Although the mullite fibre addition can improve the aged hardness and accelarate ageing hardening process of the marix alloy to some extent

the mullite fibre only silightly restrains the formation of GP zone.Excess Si or Mg not only accelarated the ageing hardening process of the composites and its matrix alloy but also obviously advanced the ageing peak of both materials.Mullite short fibre with excess Si or Mg has the interaction on ageing hardening process of the composites.