采用原位反应近液相线铸造方法制备Al2O3p/Al-Cu基复合材料,对其进行二次加热,研究晶粒的形貌演变和长大规律。用光学显微镜观察组织、I mage Tool软件测量平均晶粒尺寸、I mage pro plus软件测量合金液相率,并与理论计算数值比较。结果表明,在590℃保温10、20、40、60 min后,Al2O3p/Al-Cu基复合材料的平均晶粒尺寸比不含Al2O3颗粒的基体合金减少15～25μm,液相率依次为11.6%、13.2%、15.3%、20.9%,较基体合金的液相率小且增长速度慢。说明Al2O3在合金的二次加热过程中对晶粒长大行为具有明显的抑制作用,从而为优化半固态组织提供了一种新思路。
【英文摘要】
The semi-solid Al2O3p/Al-Cu alloys cast with in-situ near-liquidus casting technology were reheated,and its microstructural evolution and grain growth mechanism were studied by means of optical microscope,the grain sizes and liquid were measured using Image tool,Image pro plus,compared with theoretical calculation.The results indicated that the in-situ Al2O3 particles can not only keep liquidus cast Al-Cu alloy with fine and globular microstructure,but alsocontrol evidently grains growth by pinning effect d...
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