【作者】 姜龙涛； 陈国钦； 修子扬； 张强； 孙兴国； 武高辉；

【Author】 Jiang Longtao,Chen Guoqin,Xiu Ziyang,Zhang Qiang,Sun Xingguo,Wu Gaohui (Department of Materials Science and Technology,Harbin Institute of Technology,Harbin 150001)

【机构】 哈尔滨工业大学材料科学与工程学院；

【摘要】 选用0.3μm的Al₂O₃颗粒,制备了体积分数为30%的Al₂O_3P/Al-Cu-2.0Mg和Al₂O_3P/Al-Cu-2.5Mg两种复合材料,利用布氏硬度测试、DSC分析和TEM观察等方法,对这两种复合材料及其相应基体合金的时效硬化行为进行研究。结果表明:亚微米Al₂O₃颗粒的加入使复合材料的硬度显著提高,但时效前后复合材料硬度提高的幅度较基体合金低得多,且亚微米Al₂O₃颗粒的加入抑制了GP区的形成,使S’相放热峰变宽;Mg含量增加对铝合金和复合材料的时效过程均有不同程度的促进作用,且硬度值也随之增加。更多还原

【Abstract】 30%Al₂O_3P/Al-Cu-2.0Mg composite and Al₂O_3P/Al-Cu-2.5 Mg composite with 0.3μm-Al₂O₃ particles were fabricated.Age-hardening behaviors of two composites and the related matrix alloy were studied by means of Brinell-hardness measurement,DSC and TEM.Results showed that due to the addition of sub-micro Al₂O₃ particles,hardness of the composite was obviously improved.While the age-hardening efficiency of Al₂O_3P/Al composite was lower than that of the monolithic matrix alloy.And the formation of G.P.regions was suppressed by the introduction of sub-micro Al₂O₃ particles,which broaden the exothermic peak of s_phase.The increasing of Mg content had differ degree effects on accelerating the aging process of aluminum alloy and composites, furthermore,the hardness increased accordingly.更多还原