原位Al_2O_3/Al-Cu复合材料的制备与组织研究  

Preparation and Microstructure of In-situ Al_2O_3/Al-Cu Composite

作　　者：刘慧敏[1] 王楠[1] 苏娟[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,呼和浩特010051

出　　处：《材料工程》2014年第11期23-27,共5页Journal of Materials Engineering

基　　金：教育部“春晖计划”(No.Z2011063)

摘　　要：采用原位反应近液相线铸造方法制备含有3．6％（质量分数）原位A12O3颗粒的A1-6.8Cu基复合材料，在基体合金的固液两相区选择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。通过光学显微镜及透射电镜观察合金的组织结构，研究A12O2原位颗粒对材料组织的影响。结果表明：原位A12O2颗粒对A16．8Cu合金的铸态组织具有一定的细化作用，但没有明显的球化作用。在半固态二次加热过程中原位A12O3颗粒对晶粒长大行为具有抑制作用和球化作用，与基体合金相比，在相同的二次加热条件下晶粒尺寸减小20～40μm。In-situreactive near-liquidus cast 3.6%(mass fraction)Al2O3/Al-6.8Cu composite was reheated isothermally at 580,590,600℃and 610℃,which is in the two-phase(liquid and solid)zone of Al-6.8Cu alloy,for 10-60 min,then quenched in water to stabilize the semi-solid structure.The microstructures of in-situreactive near-liquidus cast 3.6% Al2O3/Al-6.8Cu composite were observed using OM and TEM,to study the effect of in situ Al2O3 particles on structure.The results show that the in-situ Al2O3 particles can not make near-liquidus cast Al-6.8Cu alloy with equiaxed grains but can make it with fine grains.In-situ Al2O3 particles control evidently grains growth by pinning effect during reheating.The average grain sizes of 3.6% Al2O3/Al-6.8Cu alloys decrease 20-40μm compare to matrix Al-6.8Cu alloy at the same condition of reheating.

关 键 词：原位Alz0.颗粒 近液相线铸造 铝基复合材料 微观组织 

分 类 号：TG115.213.1[金属学及工艺—物理冶金]