Effects of Temperature on the Ageing Behavior of Mullite/Al-3.5Cu Composite

Li Wei  Jing Shan  Shen Baoluo  Gao Shengji  Tu Mingjing

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Effects of Temperature on the Ageing Behavior of Mullite/Al-3.5Cu Composite
Issue 3, Pages: 6-8(2002)
Published： 2002 ，
DOI：

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[1]李伟,,,,,,,,,,景山,沈保罗,高升吉,涂铭旌.温度对Mullite/Al-3.5Cu复合材料时效的影响[J].特种铸造及有色合金,2002(03):6-8+3.

Li Wei Jing Shan Shen Baoluo Gao Shengji Tu Mingjing. Effects of Temperature on the Ageing Behavior of Mullite/Al-3.5Cu Composite. [J]. Special Casting & Nonferrous Alloys (3):6-8(2002)
[1]李伟,,,,,,,,,,景山,沈保罗,高升吉,涂铭旌.温度对Mullite/Al-3.5Cu复合材料时效的影响[J].特种铸造及有色合金,2002(03):6-8+3. DOI：

Li Wei Jing Shan Shen Baoluo Gao Shengji Tu Mingjing. Effects of Temperature on the Ageing Behavior of Mullite/Al-3.5Cu Composite. [J]. Special Casting & Nonferrous Alloys (3):6-8(2002) DOI：

摘要

用挤压铸造方法制备Mullite/Al 3.5Cu复合材料及其基体合金。用硬度测试（HB）、差示扫描量热仪（DSC）和透射电镜（TEM）等手段

研究了温度对复合材料及其基体合金时效行为的影响。结果表明 :复合材料和基体合金具有相似的时效硬化曲线及相同的时效析出序列

随时效温度的升高

峰值硬度降低、时效析出过程加快 ;莫来石纤维除了能明显提高Al 3.5Cu合金的时效硬度外

还能加速其时效析出进程

但对GP区的形成具有明显的抑制作用

而对θ相的析出影响不大

Abstract

Short mullite fibre reinforced Al 3.5Cu composite and its base alloy were prepared in squeezing casting. Effects of temperature on the ageing behavior of the composite and its base alloy were studied by means of hardness measurement（HB）

differential scanning calorimetry（DSC） and transmission electron microscope（TEM）. The results showed that both the composite and the base alloy have the similar ageing hardening curves and the same precipitation sequence: the higher ageing temperature is responsible for lower peak hardness and faster ageing precipitation progress. Short mullite fibre not only increase the aged hardness of Al 3.5Cu alloy but also accelerate the ageing precipitation. It is also found that the GP zone formation is greatly suppressed by short mullite fibre while the precipitation of θ（Al 2Cu） is nearly unchanged .