Microstructures and Ageing Characteristics of Mullite/ZL101 Composite in Squeezing Casting

Long Jianping  Li Wei  Shen Baoluo  Gao Shengji  Tu Mingjing

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Microstructures and Ageing Characteristics of Mullite/ZL101 Composite in Squeezing Casting
Issue 2, Pages: 12-14(2002)
Published： 2002 ，
DOI：

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[1]龙剑平,,,,,,,,,,李伟,,,,,,,,,,沈保罗,,,,,,,,,,高升吉,,,,,,,,,,涂铭旌.Mullite/ZL101复合材料的组织及时效特性[J].特种铸造及有色合金,2002(02):12-14+3-2.

Long Jianping Li Wei Shen Baoluo Gao Shengji Tu Mingjing. Microstructures and Ageing Characteristics of Mullite/ZL101 Composite in Squeezing Casting. [J]. Special Casting & Nonferrous Alloys (2):12-14(2002)
[1]龙剑平,,,,,,,,,,李伟,,,,,,,,,,沈保罗,,,,,,,,,,高升吉,,,,,,,,,,涂铭旌.Mullite/ZL101复合材料的组织及时效特性[J].特种铸造及有色合金,2002(02):12-14+3-2. DOI：

Long Jianping Li Wei Shen Baoluo Gao Shengji Tu Mingjing. Microstructures and Ageing Characteristics of Mullite/ZL101 Composite in Squeezing Casting. [J]. Special Casting & Nonferrous Alloys (2):12-14(2002) DOI：

摘要

用挤压铸造制备Mullite/ZL10 1复合材料。用光学显微镜及透射电镜（TEM）观察复合材料及其基体合金的微观组织

用硬度测试及差示扫描量热仪研究Mullite/ZL10 1复合材料及其基体合金的时效特性。结果表明 :采用挤压铸造法可获得复合良好的Mullite/ZL10 1复合材料

Mullite纤维对ZL10 1合金有明显的强化作用 ;在整个时效过程中

复合材料的时效硬度明显高于基体合金

纤维的引入没有改变基体合金时效析出序列

对低温下由空位扩散控制的SSS -GP反应无明显的抑制作用 ;复合材料中 β″析出反应的峰值温度及活化能较基体合金的低

时效硬化过程得到一定程度的加速

Abstract

The microstructures of Mullite/ZL101 composite and its matrix alloy in squeezing casting were observed by optical microscope and TEM. The ageing characteristics of the composite and its matrix alloy were examined by HB and Differential Scanning Calorimeter （DSC）. The results showed that the good Mullite/ZL101 composite can be made in squeezing casting. The Mullite fibre has obviously strengthening（hardening） effect on ZL101 alloy. The aged hardness of the composite is much higher than that of the matrix alloy in the whole isothermal ageing process. The ageing precipitation sequence of the matrix alloy has not been changed and the SSS→GP reaction controlled by vacancy diffusion at low temperature has not been significantly suppressed with the synthesization of short mullite fibre. The peak temperature and activation energy value in β″ precipitation of the composite are lower than those of the matrix alloy. The ageing hardening course of Mullite/ZL101 composite is accelerated obviously to some extent.