(1. 四川大學(xué) 金屬材料工程系， 成都 610065;
2. 上海交通大學(xué) 金屬基復(fù)合材料國家重點實驗室， 上海 200030)
摘 要: 用擠壓鑄造方法制備了Mullite/Al-Cu復(fù)合材料。用硬度測試儀、差示掃描量熱儀(DSC)和透射電鏡(TEM)等設(shè)備研究了鋁基復(fù)合材料及其基體合金中Cu含量變化對時效硬化行為的影響，同時還研究了增強纖維對時效相的析出序列、析出相和位錯結(jié)構(gòu)的影響。結(jié)果表明，無論是在復(fù)合材料中還是在基體合金中，隨著Al-Cu合金中Cu含量的增加，時效硬化過程均有不同程度的加速；Mullite纖維的引入提高了Al-Cu合金的時效硬度，明顯加速了Al-Cu合金的時效硬化過程，對GP區(qū)的形成有抑制作用，但不影響基體沉淀相的析出順序。
關(guān)鍵字: Mullite短纖維； Al-Cu合金； 時效； 位錯
short mullite fibre reinforced Al-Cu composites
WANG Hong-hua２， WU Zhen-gan２， ZHANG Di２
（1. Department of Metallic Materials Engineering，
Sichuan University， Chengdu 610065， P.R. China;
2. State Key Lab of MMCs， Shanghai Jiaotong University，
Shanghai 200030， P.R.China）
Abstract: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 agehardening 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.
Key words: mullite fibre； Al-Cu alloys； ageing； dislocation
