为了研究亚微米级Al2O3颗粒对基体合金时效过程的影响规律,在6061铝合金基础上调整Mg、Si含量,采用压力浸渗法,制备了Al2O3体积分数为30%的亚微米级Al2O3P/Al-2.26Mg-0.63Si复合材料.通过硬度试验,SEM和TEM等手段,研究了复合材料及其基体合金的时效行为.结果表明,Al-2.26Mg-0.63Si合金的时效过程比较明显,随时效温度的提高峰时效时间提前,190℃时出现时效软化现象.亚微米Al2O3颗粒的加入强烈抑制复合材料的时效过程,时效曲线未出现明显时效峰.分析认为,由于大部分Mg元素被消耗在界面形成MgAl2O4,且基体中位错稀少,不利于溶质原子扩散,因此复合材料中沉淀相在过时效阶段仍停留在GP区状态,没有充分长大,时效析出受到抑制.
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