原位Al2O3颗粒对Al-Cu合金二次加热组织的影响  

Effect of in-situ Al_2O_3 particles on reheating microstructure of Al-Cu alloy

作　　者：刘慧敏[1] 张复懿[1] 吴宏明 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]内蒙古第一机械制造(集团)公司内蒙古,内蒙古包头014030

出　　处：《材料热处理学报》2011年第4期38-42,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(50661003)

摘　　要：采用原位反应近液相线铸造方法制备含有3.6 wt%原位Al2O3颗粒的Al-Cu铝合金,在其固液两相区的580、590、600和610℃进行二次加热保温实验,淬火固定其半固态组织后,通过光镜观察合金的晶粒长大规律,研究其晶粒长大行为,分析原位Al2 O3颗粒对合金二次加热组织的影响。结果表明,原位Al2 O3颗粒对Al-Cu合金的铸态组织没有明显的细化和球化作用,但是在合金的二次加热过程中对晶粒长大行为具有抑制作用,与基体合金相比,在相同的二次加热条件下晶粒尺寸减小30～40μm。Microstructure of in-situ reactive near-liquidus cast 3.6 wt% Al2O3/Al-Cu composite at semi-solid state was observed by optical microscopy.Grain sizes of the material were measured using a mean linear intercept method and the effect of in-situ Al2 O3 particles on grain growth in the two-phase（liquid ＋ solid） region of Al-Cu alloy was analyzed.The results show that in-situ Al2 O3 particles can not make near-liquidus cast Al-Cu alloy with fine and equiaxed grains but control evidently grains growth by pinning effect during reheating.The average grain sizes of Al-Cu alloy containing 3.6 wt% Al2 O3 decrease by 30-40 μm compare to matrix Al-Cu alloy at the same condition of reheating.

关 键 词：AL-CU合金 二次加热 晶粒长大 原位Al2O3颗粒 

分 类 号：TG146.2[一般工业技术—材料科学与工程]