CAJ | 학술논문

用挤压铸造方法制备了Mullite/Al-Cu复合材料。用硬度测试仪、差示扫描量热仪(DSC)和透射电镜(TEM)等设备研究了铝基复合材料及其基体合金中Cu含量变化对时效硬化行为的影响，同时还研究了增强纤维对时效相的析出序列、析出相和位错结构的影响。结果表明，无论是在复合材料中还是在基体合金中，随着Al-Cu合金中Cu含量的增加，时效硬化过程均有不同程度的加速； Mullite纤维的引入提高了Al-Cu合金的时效硬度，明显加速了Al-Cu合金的时效硬化过程，对GP区的形成有抑制作用，但不影响基体沉淀相的析出顺序
용제압주조방법제비료Mullite/Al-Cu복합재료。 용경도측시의、차시소묘량열의(DSC)화투사전경(TEM)등설비연구료려기복합재료급기기체합금중Cu함량변화대시효경화행위적영향， 동시환연구료증강섬유대시효상적석출서렬、 석출상화위착결구적영향。 결과표명， 무론시재복합재료중환시재기체합금중， 수착Al-Cu합금중Cu함량적증가，시효경화과정균유불동정도적가속； Mullite섬유적인입제고료Al-Cu합금적시효경도，명현가속료Al-Cu합금적시효경화과정， 대GP구적형성유억제작용， 단불영향기체침정상적석출순서
Short mullite fibre reinforced Al-3.45Cu， Al-4.05Cu and Al-4.45Cu composites and their base alloys were fabricated by squeeze casting. The effect of variable Cu content on the age-hardening behaviour of the composites and the base alloys， the precipitation procedure and the microstructure of dislocation and precipitates have been studied by means of hardness measurement(HB)， differential scanning calorimetry(DSC)and transmission electron microscope(TEM). It is shown that the age-hardening progress is accelerated apparently whether for the composites or the base alloys with increasing the content of copper in the testing materials. The aged hardness of Al-Cu alloys is increased when synthesized with the short mullite fibres， which obviously accelerates the age-hardening progress of Al-Cu alloys and suppresses the formation of GP zones. But the sequence of precipitates has not been changed in the testing composites.